JP2008244940A - Digital camera and control method thereof - Google Patents

Abstract

An object of the present invention is to accurately manage the number of shootable RAW images that are reversibly compressed.
A free space detecting unit detects a free space of a memory card. The file detection unit 51 detects the number of compressed RAW files recorded on the memory card 10 and the total file size. The average file size calculator 52 calculates the average file size of the compressed RAW file from the number of files detected by the file detector 51 and the total file size. The number of recordable sheets calculation unit 53 calculates the number of compressed RAW files that can be recorded on the memory card 10 from the free space and the average file size. The display control unit 54 displays the number of shootable images on the LCD panel 26.
[Selection] Figure 4

Description

  The present invention relates to a digital camera for reversibly compressing a RAW image composed of CCD-RAW data generated by photographing and recording it on a recording medium, and a control method therefor.

  In a digital camera that captures an image of an object using an image sensor such as a CCD or CMOS, an analog image signal generated by the image sensor is converted into digital image data (hereinafter referred to as RAW data). It is converted into an image file such as JPEG and recorded on a recording medium such as a memory card. For example, JPEG files are subjected to irreversible compression such as fixed-length compression (compressed so that the data amount of the compressed file is substantially constant), so that the number of records that can be recorded on a recording medium can be managed accurately and easily. There is an advantage that can be done.

  In the fixed length compression, in order to keep the amount of data substantially constant, the quantization scale is expanded or the bit stream is cut off at the stage of compression processing. In these processes, image information is deleted within a visually inconspicuous range. However, in applications that require high image quality (image processing for plate making, enlarged display of images, etc.), deletion of this image information becomes a problem.

Therefore, some digital still cameras include a reversible compression of uncompressed RAW data to generate compressed RAW data and record it on a recording medium such as a memory card (see, for example, Patent Documents 1 and 2). . For example, DPCM (Differential Pulse Code Modulation) is well known as the lossless compression.
JP 2002-218387A JP 2002-354405 A

  Lossless compression is variable length compression in which the data size varies with the image. Therefore, there has been a problem that it becomes difficult to manage the recordable number of recording media. In particular, when the number of shootable images is “1” and the data size after the lossless compression exceeds the remaining capacity, there is a problem that the compressed RAW data cannot be stored in the recording medium.

  In addition, the case where the user selects recording with compressed RAW data means that photographing is most important for the user. Therefore, in such a case, an accident that the photographing result cannot be stored must be avoided as much as possible.

  In order to solve the above-described problems, the present invention provides a digital camera and a control method thereof that can accurately manage the number of shootable RAW images that have been reversibly compressed.

  In order to solve the above problems, a digital camera of the present invention includes an imaging unit that captures a still image and generates a RAW image composed of CCD-RAW data, and a reversible compression that generates a compressed RAW image by reversibly compressing the RAW image. Processing means, recording processing means for recording a compressed RAW image on a recording medium, free capacity detecting means for detecting the free capacity of the recording medium, and an average for specifying an average data size of the compressed RAW image recorded on the recording medium Based on the calculation results of the data size specifying means, the recordable number calculating means for calculating the number of compressed RAW images that can be recorded on the recording medium based on the free space and the average data size, and the recordable number calculating means, This is composed of display control means for displaying on the display means the number of images that can be photographed or that photography is not possible.

  The average data size specifying means calculates the average data size of the compressed RAW image from the number of images and the total data size, and a data detector for detecting the number of compressed RAW images and the total data size recorded on the recording medium. This is composed of an average data size calculation unit.

  Another average data size specifying means extracts the shooting date and time from the supplementary information of the compressed RAW image recorded on the recording medium, and selects a compressed RAW image having a shooting date and time corresponding to a preset detection period. An imaging date and time extraction unit, a data detection unit for detecting the number and total data size of the selected compressed RAW images, and an average data size calculation for calculating the average data size of the compressed RAW images from the number of images and the total data size It consists of parts.

  In addition, when the compressed RAW image of the shooting date / time corresponding to the detection period is not recorded on the recording medium, the shooting date / time extraction unit gradually expands the detection period and selects the corresponding compressed RAW image. It is.

  Still another average data size specifying means extracts the shooting date and time from the supplementary information of the compressed RAW image recorded on the recording medium, and the compressed RAW image has the shooting date and time corresponding to a plurality of preset detection periods. An imaging period extraction unit that selects a data, a data detection unit that detects the number of compressed RAW images and the total data size in each detection period, and a compression for each detection period from the number of images and the total data size in each detection period An average data size calculation unit by period for calculating an average data size by period of the RAW image, a weighting unit for weighting the average data size by period according to a time difference from the current date and time, and an average data size by period The average data size is calculated from the average data size of the entire compressed RAW image recorded on the recording medium. .

  Further, the weighting unit reduces the weight as going back from the current date and time to the past.

  Still another average data size specifying means includes a data detection unit for detecting the number of compressed RAW images and the total data size recorded on the recording medium, and an average data size of the compressed RAW image from the number of images and the total data size. An average data size calculation unit for calculating the RAW image and a quantization table used for irreversible compression by reducing the size of the RAW image when generating the reduced image from the reduced image attached to the compressed RAW image A quantization table extraction unit, a correction coefficient specifying unit that calculates an average value of high frequency components of the quantization table, specifies a correction coefficient used for correcting the average data size based on the average value, and average data using the correction coefficient It comprises a correction unit for correcting the size.

  Further, another average data size specifying means is configured to display current images such as shutter speed, aperture value, ISO sensitivity, etc. from the imaging means during live view display in which the imaging means is continuously operated to display the subject image on the display means in real time. Shooting information such as shutter speed, aperture value, ISO sensitivity, etc. is extracted from the incidental information of the compressed RAW image recorded on the recording medium and the current shooting information acquisition unit for acquiring information, and similar to the current shooting information A shooting information extraction unit that selects a compressed RAW image having shooting information to perform, a data detection unit that detects the number of images and the total data size of the selected compressed RAW image, and a compressed RAW image based on the number of images and the total data size. This is composed of an average data size calculator for calculating the average data size.

  Still another average data size specifying means pre-records a size ratio such as an image size between still image shooting and a live view display in which an image of a subject is displayed in real time by continuously operating the imaging means. The RAW image at the time of displaying the through image is reversibly compressed at a predetermined timing by the size ratio recording unit and the reversible compression processing means, and the data size of the compressed RAW image obtained at that time and the size ratio are used to calculate the through An expected data size calculation unit that calculates an expected data size of a compressed RAW image obtained when a subject image that is the same as that of the image display is captured, and the recordable number calculation means includes a free space, an average data size, a free space, and an expected The number of compressed RAW images that can be recorded on the recording medium is calculated based on the data size, and the display control means calculates the average data size, the expected data size, Based on the number of recordable lesser one of recordable number based, it is obtained so as to be displayed on the display means that it can not photographable number or shooting.

  Further, a face information extracting unit that analyzes a RAW image of the through image and extracts face information representing a person's face is provided, and the predicted data size calculation unit sends the through image to the lossless compression processing unit when the face information changes. A RAW image is reversibly compressed.

  Still another average data size specifying means extracts face information representing a person's face by analyzing the RAW image generated by the image pickup means during live view display and the compressed RAW image selected by the shooting information extraction unit. Comparing the face information of the through image display and the face information of the compressed RAW image, and the face information of the through image display is the same as any or all of the number, position, occupied area, etc. of the face, Alternatively, a face information comparison unit that selects a compressed RAW image to be approximated is provided, the data detection unit detects the number of images and the total data size of the compressed RAW images selected by the face information comparison unit, and the average data size calculation unit The average data size of the compressed RAW image is calculated from the number and the total data size.

  Further, a recordable number recording means is provided which records the recordable number of sheets and is updated each time the recordable number of sheets is newly calculated.

  Further, the recordable number of sheets is calculated when a new compressed RAW image is recorded on the recording medium or when a recorded compressed RAW image is deleted from the recording medium.

  The average data size specifying means sets the data size of the RAW image recorded on the recording medium as the average data size when the compressed RAW image is not recorded on the recording medium.

  Another digital camera according to the present invention includes an imaging unit that generates a RAW image composed of CCD-RAW data at the time of still image shooting and a through image display for displaying a subject image in real time, and reversibly compresses the RAW image. The size ratio of the image size, etc., between the reversible compression processing means for generating a compressed RAW image, the recording processing means for recording the compressed RAW image at the time of still image shooting on a recording medium, The recorded size ratio recording means and the reversible compression processing means reversibly compress the RAW image at the time of displaying the through image at a predetermined timing, and the data size and size ratio of the compressed RAW image obtained at that time are used to calculate the through image. Expected data size calculating means for calculating an expected data size of a compressed RAW image obtained when a still image of the same subject as that displayed is captured, and a free space on the recording medium Based on the calculation results of the free space detection means to detect, the recordable number calculation means for calculating the number of compressed RAW images that can be recorded on the recording medium, and the recordable number calculation means based on the expected data size and free space And a display control means for displaying on the display means that the number of images that can be taken or that the image cannot be taken.

  Furthermore, face information extraction means for analyzing the RAW image at the time of displaying the through image and extracting face information representing a person's face is provided, and the lossless compression processing means converts the RAW image of the through image display when the face information changes. Reversible compression is performed.

  Another digital camera according to the present invention includes an imaging unit that captures a still image and generates a RAW image composed of CCD-RAW data, and a reversible compression processing unit that generates a compressed RAW image by reversibly compressing the RAW image. Recording processing means for recording the compressed RAW image on the recording medium, free capacity detecting means for detecting the free capacity of the recording medium, average data size recording means for recording the average data size of the compressed RAW image, and free capacity Based on the average data size, a recordable sheet number calculating unit that calculates the number of compressed RAW images that can be recorded on the recording medium, and the number of images that can be shot or the fact that shooting is not possible based on the calculation result of the recordable sheet number calculating unit. Display control means for displaying on the display means, and when a still image is captured, a data source of the compressed RAW image generated by the still image capture 'S is what you as documented in average data size recording means as a new average data size.

  In addition, another digital camera includes an imaging unit that captures a still image and generates a RAW image composed of CCD-RAW data, a lossless compression processing unit that generates a compressed RAW image by reversibly compressing the RAW image, and a compression Recording processing means for recording a RAW image on a recording medium, free capacity detecting means for detecting the free capacity of the recording medium, a first average data size that is an average data size of the compressed RAW image, and an average data size of the RAW image Based on the average data size recording means for recording a certain second average data size, the free space and the first average data size, the first recordable number of sheets, which is the number of compressed RAW images that can be recorded on the recording medium, is calculated. When the first recordable number is “1” or more, the number of compressed RAW images that can be recorded on the recording medium based on the free space and the second average data size And a recordable sheet number calculating means for calculating the second recordable sheet number, and when the first recordable sheet number is less than “1”, the display means displays that the image cannot be taken, and the first recordable sheet number and the second recordable sheet number are displayed. When the number of possible images is both “1” or more, the number of shootable images is displayed on the display means, and when the first recordable number is “1” or more and the second recordable number is less than “1”, it is not possible to shoot. Display control means for displaying a warning on the display means, and when the still image shooting is performed, the data size of the compressed RAW image and the raw image generated by the still image shooting is newly set. The average data size and the second average data size are recorded in the average data size recording means.

  Also, the digital camera control method of the present invention is a digital camera control method for capturing a still image, generating a RAW image composed of CCD-RAW data, and recording a compressed RAW image obtained by reversibly compressing the RAW image on a recording medium. , The step of detecting the free space of the recording medium, the step of specifying the average data size of the compressed RAW image recorded on the recording medium, and the free space and the average data size can be recorded on the recording medium The method includes a step of calculating the number of compressed RAW images, and a step of displaying the number of images that can be photographed or the fact that photographing is not possible based on the number of recordable images.

  Further, another control method performs a through image display for displaying an image of a subject in real time, generates a RAW image composed of CCD-RAW data, and records a compressed still image RAW image obtained by reversibly compressing the RAW image as a recording medium. In a method for controlling a digital camera for recording, a step of detecting a free space of a recording medium, a step of detecting a data size by reversibly compressing a RAW image at the time of displaying a through image, a data size, a still image shooting and a through Based on the ratio of the image size to the image display and the like, the step of calculating the expected data size of the compressed RAW image obtained when the same subject as the through image display is taken, and the free space and the expected data size, Shooting is possible based on the step of calculating the number of compressed RAW images that can be recorded on the recording medium and the result of calculating the number of recordable images. Those comprising the step of displaying to the effect that can not be number or shooting.

  Still another control method is a digital camera control method in which a still image is taken to generate a RAW image composed of CCD-RAW data, and a compressed RAW image obtained by reversibly compressing the RAW image is recorded on the recording medium. A step of detecting a free space, a step of calculating the number of compressed RAW images that can be recorded on a recording medium based on the free space and a preset average data size of the compressed RAW images, Based on the number of shots that can be taken or the fact that shooting is not possible, and when still image shooting is performed, the data size of the compressed RAW image generated by the still image shooting is set as the new average data size The step to perform is provided.

  Still another control method is a digital camera control method in which a still image is taken to generate a RAW image composed of CCD-RAW data, and a compressed RAW image obtained by reversibly compressing the RAW image is recorded on the recording medium. The number of compressed RAW images that can be recorded on the recording medium based on the step of detecting the free space, the free space, and a first average data size that is a preset average data size of the compressed RAW images. A step of calculating one recordable number of sheets, a step of displaying that shooting is impossible when the first recordable number of sheets is less than “1”, and a free space when the first recordable number of sheets is “1” or more. And the number of compressed RAW images that can be recorded on the recording medium based on a preset second average data size that is the average data size of the RAW images. (2) a step of calculating the recordable number of sheets, a step of displaying the number of recordable images when both the first recordable number of sheets and the second recordable number of sheets are “1” or more, and the first recordable number of sheets is “1”. As described above, the step of displaying a warning that there is a possibility that the image cannot be shot when the number of recordable 2 sheets is less than “1”, and the compressed RAW generated by the still image shooting when the still image shooting is performed. A step of setting the file sizes of the image and the RAW image as new first average data size and second average data size is provided.

  According to the digital camera and the control method of the present invention, the number of shootable compressed RAW images whose data size after lossless compression is not constant can be obtained with high accuracy. Further, since the average file size is obtained based on the compressed RAW image of the shooting date and time close to the current date or the RAW image weighted according to the shooting date and time, the average file size close to the current shooting status is obtained, A more accurate number of images that can be shot can be displayed.

  Further, since the average file size can be obtained from the accompanying thumbnail image quantization table in consideration of the compression state of the fine portion of the image, a more accurate number of shootable images can be displayed.

  In addition, by searching the compressed RAW image based on the shooting information, the average file size can be obtained based on the compressed RAW image similar to the image being displayed as a through image, so that more accurate number of shots can be displayed. be able to. Furthermore, since the average file size can be obtained from the compressed RAW image that approximates not only the shooting information but also the face information, a more accurate number of shots can be displayed.

  Further, since the data size at the time of still image shooting is predicted from the image being displayed as a through image, it is possible to always display the number of shots that can be taken according to the shooting situation. Further, the number of shootable images can be displayed even when no file is recorded in the memory card. Furthermore, since the number of shootable images is calculated when the face information of the through image display changes, more accurate shootable number display can be performed.

  In addition, since the number of images that can be captured calculated from the compressed RAW image that has been captured and the number of images that can be captured calculated from the through image display are obtained simultaneously, the number of images that can be captured is displayed based on the smaller value. A reliable display of the number of images that can be taken can be performed.

  Further, since the number of shootable images is obtained from the file size at the time of the last still image shooting, it is possible to display the number of shootable images with a very simple and high accuracy.

  The digital camera 2 of the present invention shown in FIG. 1 includes a CPU 5 connected to each part via data buses 3 and 4. The CPU 5 is connected to an operation panel 6 having a power switch, a mode switch for switching operation modes, a setting switch for changing various settings, a shutter switch operated at the time of shooting, and the like. Each unit is controlled according to the control program stored in the EEPROM 7.

The digital camera 2 has a function of selecting a recording format of an image generated at the time of shooting by switching settings with a setting switch. Selectable recording formats include, for example, a RAW image format obtained by digitizing an imaging signal output from an image sensor, a compressed RAW image format obtained by reversibly compressing the RAW image, and a JPEG image obtained by irreversibly compressing the RAW image by YC conversion. Format. As shown in FIG. 2, a RAW file 11, a compressed RAW file 12, and a JPEG file 13 generated from images of various formats are recorded in a mixed manner on the memory card 10 set in the digital camera 2.

  The CCD 16 serving as an image pickup device is driven and controlled by a CCD driver 17 to pick up an image of a subject incident through a photographing lens 18 and a diaphragm 19 and output an analog image pickup signal. The imaging signal output from the CCD 16 is subjected to preprocessing such as gain adjustment by the analog signal processing circuit 20, and then converted to a digital RAW image composed of CCD-RAW data by the analog-digital converter (ADC) 21. . The RAW image is recorded in the SDRAM 23 via the data bus 4 by the memory control circuit 22.

  The imaging means of the present invention comprises a photographic lens 18, an aperture 19, a CCD 16, a CCD driver 17, an analog signal processing circuit 20, an ADC 21, and the like. Although not shown in detail, the photographing lens 18 includes a focus lens and a zoom lens, and is driven by a lens driving unit 24 controlled by the CPU 5. The diaphragm 19 is a diaphragm mechanism having a plurality of diaphragm blades, for example, and is driven by a diaphragm driving unit 25 controlled by the CPU 5.

  When displaying a through image in which the subject image is displayed in real time on the LCD panel 26 as a display means, the CCD 16 is continuously imaged at a predetermined frame rate, and the imaging signal is thinned out so that the number of pixels is reduced for the through image display. Read out. A RAW image based on the thinned imaging signal is recorded in the SDRAM 23. The digital signal processing circuit 27 reads out a RAW image for live view display from the SDRAM 23, performs various signal processing for live view display such as shading correction, performs YC conversion processing, and then records the image data in the SDRAM 23 again. To do. The LCD driver 28 reads YC format image data from the SDRAM 23 and causes the LCD panel 26 to display the image.

  When still image shooting is performed by operating the release switch, image pickup signals of all pixels are read from the CCD 16, and a RAW image for still image shooting is generated and recorded in the SDRAM 23. The irreversible compression / decompression circuit 31 reads out a RAW image from the SDRAM 23, performs reduction and lossless compression, generates a thumbnail image in JPEG format, and records it in the SDRAM 23.

  When the compressed RAW format is selected as the recording format, the reversible compression / decompression circuit 34 reads out a RAW image of still image shooting from the SDRAM 23, performs a reversible compression to generate a compressed RAW image, and records the SDRAM 23 again. The CPU 5 functions as a file generation unit at the time of image recording, reads the compressed RAW image 37 and the thumbnail image 38 from the SDRAM 23 as shown in FIG. 3, generates header information 39 including various shooting information from these images, The header information 39 is attached to the compressed RAW image 37 to generate the compressed RAW file 12 and recorded on the memory card 10 by the external media control circuit 42.

  When the RAW image format is selected as the recording format, the CPU 5 generates a RAW file 11 containing a RAW image instead of the compressed RAW image. When the JPEG format is selected, the JPEG file 13 is generated from the JPEG image generated by the lossy compression / decompression circuit 31 and recorded in the memory card 10.

  The face detection circuit 45 analyzes RAW images generated when displaying a through image and shooting a still image, and detects face information such as the number and position of the person's face as an object, an occupied area, and the like. This face information is input to the CPU 5 and used for focusing, exposure control, and the like with a human face as the main subject.

  FIG. 4 is a functional block diagram showing functions of the CPU 5 in the first embodiment of the present invention. When the CPU 5 displays the number of shootable images of the compressed RAW file 12 on the LCD panel 26, the free space detection unit 50, the file detection unit 51, the average file size calculation unit 52, according to the operation program stored in the EEPROM 7, It functions as a recordable number calculation unit 53 and a display control unit 54.

  The free space detection unit 50 detects the free space of the memory card 10 via the external media control circuit 42. The detected free space is input to the recordable sheet number calculation unit 53. The file detection unit 51 serving as a data detection unit detects the number of compressed RAW files 12 recorded on the memory card 10 and the total file size. The number of files and the file size are input to the average file size calculation unit 52.

  An average file size calculation unit 52 that is an average data size calculation unit calculates the average file size of the compressed RAW file 12 based on the number of files detected by the file detection unit 51 and the total file size. This average file size is input to the recordable sheet number calculation unit 53.

  The recordable number calculation unit 53 calculates the number of compressed RAW files 12 that can be recorded on the memory card 10 from the free space of the memory card 10 and the average file size of the compressed RAW files 12. This recordable number is input to the display control unit 54 and recorded in the EEPROM 7 which is a recordable number recording means.

  The display control unit 54 causes the LCD panel 26 to display the shootable number based on the input recordable number. For example, when the recordable number is “1” or more, the number of shootable images is displayed on the LCD panel 26. When the recordable number is less than “1”, the LCD panel 26 displays that the image cannot be taken.

  Next, the operation of the above embodiment will be described. As shown in FIG. 5, when the power of the digital camera 2 is turned on, the display control unit 54 of the CPU 5 reads the recordable number from the EEPROM 7, and when the recordable number is 1 or more, the LCD panel 26 indicates the number of recordable images. When the number of recordable sheets is less than 1, a message indicating that shooting is not possible is displayed.

  When a still image is shot by the digital camera 2 or a file is deleted from the memory card 10, the number of shots that can be shot is updated. As shown in FIG. 6, the free space detection unit 50 detects the free space of the memory card 10, and the file detection unit 51 detects the number of files and the total file size of the compressed RAW file 12 in the memory card 10.

  The average file size calculation unit 52 calculates the average file size of the compressed RAW file 12 from the number of files detected by the file detection unit 51 and the total file size. The recordable number calculation unit 53 calculates the number of compressed RAW files 12 that can be recorded on the memory card 10 from the free space and the average file size, and the display control unit 54 calculates the number of recordable images based on the calculated recordable number. Is displayed. Further, the recordable number of pieces of data in the EEPROM 7 is updated and used for displaying the number of shots when the power is turned on next time.

  In addition, the compressed RAW file 12 may not be recorded in the memory card 10 immediately after the recording format is switched to the compressed RAW format. In such a case, the file size of the uncompressed RAW file 11 may be used as the average file size. Since the file size of the RAW file 11 is substantially constant and about 30% larger than the compressed RAW file 12, if the number of storable images is obtained based on the file size of the RAW file 11, the compressed RAW file 12 is recorded after shooting. Troubles that can not be done will not occur.

  Thus, since the number of shootable images is calculated based on the average file size of the compressed RAW file 12, the number of shootable images of the compressed RAW file 12 whose file size after lossless compression is not constant can be obtained with high accuracy.

  In the above embodiment, the average file size is obtained based on all the compressed RAW files 12 recorded on the memory card 10. However, in actual use of the digital camera 2, if the shooting date and time are different, the shooting contents often differ greatly. Therefore, when the average file size is obtained from all the compressed RAW files 12, the compressed RAW file obtained from the current shooting situation is obtained. It can be considered that the difference from the file size becomes large. Therefore, the average file size may be obtained by selecting only the compressed RAW file 12 close to the current date and time from the memory card 10. Hereinafter, although another embodiment of the present invention will be described, the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 7 is a functional block diagram showing functions of the CPU 5 in the second embodiment of the present invention. The CPU 5 functions as a free space detection unit 50, a file detection unit 51, an average file size calculation unit 52, a recordable number calculation unit 53, and a display control unit 54 as in the first embodiment. 60 functions.

  As shown in FIG. 8, in the photographing date extraction unit 60, for example, a period of several hours or several days going back to the past from the current date and time is set as the detection period. This detection period may be set when the digital camera 2 is manufactured, or the user may change the setting as appropriate.

  As shown in FIG. 9, the shooting date / time extraction unit 60 extracts shooting date / time from the header information 39 of the compressed RAW file 12 recorded in the memory card 10, and the compressed RAW file 12 whose shooting date / time corresponds to the detection period is extracted. select. When there is no compressed RAW file whose shooting date / time corresponds to the detection period, the detection period may be gradually expanded in the past, and the corresponding compressed RAW file 12 may be selected again.

  The file detection unit 51 detects the number of files and the total file size of the compressed RAW file 12 selected by the shooting date extraction unit 60, and the average file size calculation unit 52 compresses from the selected number of files and the total file size. The average file size of the RAW file 12 is calculated. Thereafter, as in the first embodiment, the recordable sheet number calculation unit 53 calculates the recordable sheet number, and the display control unit 54 causes the LCD panel 26 to display the recordable sheet number.

  It is during continuous shooting that the recording capacity of the memory card 10 runs out during shooting, but it is often the case that similar images are shot during such continuous shooting. The probability of obtaining an average file size close to the current shooting situation is increased, and a more accurate number of shots can be displayed.

  In the above embodiment, the average file size is obtained from the compressed RAW file 12 within one detection period. However, when the number of files within this detection period is small, the accuracy of the obtained average file size is reduced. Sometimes. In this case, all the compressed RAW files 12 recorded in the memory card 10 may be classified by shooting date and time, and weighted according to the time difference from the current date and time to obtain the average file size.

  FIG. 10 is a functional block diagram showing functions of the CPU 5 in the third embodiment of the present invention. As in the first and second embodiments, the CPU 5 functions as a free space detection unit 50, a file detection unit 51, an average file size calculation unit 52, a recordable number calculation unit 53, and a display control unit 54, and a shooting period. Also functions as an extraction unit 65 and a weighting unit 66.

  As illustrated in FIG. 11, for example, first to third detection periods that go back to the past from the current date and time are set in the shooting period extraction unit 65. These detection periods may be set when the digital camera 2 is manufactured, or the user may be able to change the settings as appropriate.

  As shown in FIG. 12, the shooting period extraction unit 65 extracts the shooting date and time from the header information of the compressed RAW file 12 recorded in the memory card 10, and selects a compressed RAW file whose shooting date and time corresponds to each detection period. To do. The file detection unit 51 detects the number of files and the total file size for each detection period from the compressed RAW file 12 selected by the shooting period extraction unit 65.

  The average file size calculation unit 52 calculates the average file size for each period of the compressed RAW file 12 from the number of detected files and the total file size. The weighting unit 66 weights the average file size for each period. This weighting is set, for example, such that the larger the time difference from the current date and time is, the lower the weight is. The weight of the first detection period is the heaviest and the weight of the third detection period is the lowest. Thereafter, the average file size of the entire compressed RAW file 12 is calculated from the average file size for each period, and the recordable number calculation unit 53 calculates the recordable number of sheets, and the display control unit 54 can shoot on the LCD panel 26. Display the number of sheets.

  According to this, even if the number of files in a specific detection period is small, it is possible to display a more accurate number of shootable images.

  In the third embodiment, the average file size of the compressed RAW file 12 is corrected by changing the weighting according to the shooting date and time. However, the average file size is corrected using the thumbnail image 38 attached to the header information 39. May be.

  FIG. 13 is a functional block diagram showing functions of the CPU 5 in the fourth embodiment of the present invention. The CPU 5 functions as a free space detection unit 50, a file detection unit 51, an average file size calculation unit 52, a recordable number calculation unit 53, and a display control unit 54, as in the above embodiments, and a quantization table extraction unit 70. Also, it functions as the correction coefficient specifying unit 71 and the correction unit 72.

  As shown in FIG. 14, the thumbnail image 38 includes header information 75 and a JPEG image 76, and the header information 75 includes a quantization table 77 used for lossy compression when the JPEG image 76 is generated. A Huffman table 78 is included. As illustrated in FIG. 15, the quantization table extraction unit 70 extracts a quantization table 77 from each compressed RAW file 12 recorded in the memory card 10.

  The correction coefficient specifying unit 71 calculates an average value from one or more horizontal / vertical high-frequency components of each extracted quantization table, and specifies a correction coefficient for the average file size based on the calculated average value. To do. For example, “1.0” is selected as the correction coefficient when the average value is 0 to 63, “1.1” when the average value is 64 to 127, and “1.2” when the average value is 128 or more.

  The file detection unit 51 detects the number of files and the total file size of the compressed RAW file 12 recorded on the memory card 10. The average file size calculation unit 52 calculates the average file size of the compressed RAW file 12 from the number of detected files and the total file size. The correcting unit 72 corrects the average file size by multiplying the average file size by the correction coefficient specified by the correction coefficient specifying unit 71. The recordable number calculating unit 53 calculates the recordable number from the free space of the memory card 10 and the corrected average file size, and the display control unit 54 causes the LCD panel 26 to display the number of recordable images.

  According to this, since the average file size can be obtained in consideration of the compression state of the fine part of the image by the quantization table, it is possible to display the number of shootable images more accurately.

  Further, in each of the above embodiments, the average file size is obtained based only on the photographed compressed RAW file recorded on the memory card 10, but the average file size is obtained based on the live view display being performed. May be.

  FIG. 16 is a functional block diagram showing functions of the CPU 5 in the fifth embodiment of the present invention. The CPU 5 functions as a free space detection unit 50, a file detection unit 51, an average file size calculation unit 52, a recordable number calculation unit 53, and a display control unit 54 as in the above embodiments, and a current shooting information acquisition unit 80. Also, it functions as the shooting information extraction unit 81.

  The current shooting information acquisition unit 80 displays the shutter speed, aperture value, ISO sensitivity, focal length from the CCD driver 17, the lens driving unit 24, and the aperture driving unit 25 that drive the CCD 16, the imaging lens 18, and the aperture 19 during live view display. The current shooting information such as is acquired and input to the shooting information extraction unit 81.

  As shown in FIG. 17, the header information 39 of the compressed RAW file 12 includes camera type, shooting size, shooting date and time, shutter speed, aperture value, image quality mode, focus, ISO sensitivity, sharpness, strobe, white balance, and exposure program. Various shooting information such as a focal length, a strobe correction value, and a macro mode are recorded. As shown in FIG. 18, the shooting information extraction unit 81 extracts shooting information of the compressed RAW file 12 recorded in the memory card 10 and displays the current shooting during live view display input from the current shooting information acquisition unit 80. Compared to the information, the compressed RAW file 12 having similar shooting information is selected.

  The file detection unit 51 detects the number of files and the total file size of the compressed RAW file 12 selected by the shooting information extraction unit 81. The average file size calculation unit 52 calculates the average file size of the selected compressed RAW file 12 from the number of detected files and the total file size. The recordable number calculating unit 53 calculates the recordable number from the free space of the memory card 10 and the corrected average file size, and the display control unit 54 causes the LCD panel 26 to display the number of recordable images.

  According to this, since the average file size can be obtained based on a compressed RAW file similar to an image displayed as a through image, more accurate number of shootable images can be displayed. In addition, the retrieval of the header information can be performed without reducing the operation speed of the digital camera 2 because the load on the CPU 5 is small.

  In the above embodiment, the average file size is obtained from the compressed RAW file 12 having shooting information similar to the current shooting information of the through image display. However, when the subject is a person even with similar shooting information, The file size of the compressed RAW file differs depending on the number and position of the person's face and the occupied area in the entire image. Therefore, the average file size may be obtained by comparing not only the shooting information but also the through image display and the face information of the compressed RAW file.

  FIG. 19 is a functional block diagram showing functions of the CPU 5 in the sixth embodiment of the present invention. Similar to the fifth embodiment, the CPU 5 uses the free space detection unit 50, the file detection unit 51, the average file size calculation unit 52, the recordable number calculation unit 53, the display control unit 54, the current shooting information acquisition unit 80, the shooting. It functions as an information extraction unit 81 and also functions as a face information comparison unit 85 that compares the face information detected by the face detection circuit 45 and selects the compressed RAW file 12.

  As shown in FIG. 20, the face detection circuit 45, which is a face information extraction unit, reads the RAW image at the time of live view display from the SDRAM 23 after acquiring the current shooting information at the time of live view display, and determines the number of faces of the person in the subject. Face information including position, occupied area, etc. is acquired. Further, the face detection circuit 45 acquires the face information of the compressed RAW file 12 selected by the shooting information extraction unit 81 after comparing the current shooting information of the through image display and the shooting information of the compressed RAW file. The face information is input to the face information comparison unit 85.

  The face information comparison unit 85 compares the face information of the through image display with the face information of the compressed RAW file 12 selected by the shooting information extraction unit 81, and selects an approximate compressed RAW file. The file detection unit 51 detects the number of files and the total file size of the compressed RAW file 12 selected by the face information comparison unit 85. The average file size calculation unit 52 calculates the average file size of the selected compressed RAW file 12 from the number of detected files and the total file size. The recordable number calculating unit 53 calculates the recordable number from the free space of the memory card 10 and the corrected average file size, and the display control unit 54 causes the LCD panel 26 to display the number of recordable images.

  According to this, since the average file size can be obtained from the compressed RAW file that approximates not only the shooting information but also the face information, a more accurate number of shots can be displayed.

  Further, in each of the above embodiments, the average file size is obtained based on the compressed RAW file already recorded in the memory card 10, but the compression at the time of still image shooting is based on the live view display being performed. The file size of the RAW file may be obtained.

  FIG. 21 is a functional block diagram showing functions of the CPU 5 in the seventh embodiment of the present invention. The CPU 5 functions as the free space detection unit 50, the recordable number calculation unit 53, and the display control unit 54 as in the above embodiments, and further functions as the expected file size calculation unit 90. The EEPROM 7 functions as a size ratio recording means of the present invention, and a size ratio such as an image size at the time of still image shooting and through image display is recorded in advance.

  As shown in FIG. 22, when the digital camera 2 is turned on and through image display is started, the free space detection unit 50 detects the free space of the memory card 10. The expected file size calculation unit 90 controls the reversible compression / decompression circuit 34 to read a RAW image at the time of displaying a through image from the SDRAM 23 at regular intervals, and reversibly compress it to obtain the file size.

  The predicted file size calculation unit 90 calculates the predicted file size of the compressed RAW file obtained when the same subject as the through image display is captured from the file size of the compressed RAW image of the through image display and the size ratio read from the EEPROM 7. Is input to the recordable sheet number calculation unit 53. The recordable number calculating unit 53 calculates the recordable number from the free space of the memory card 10 and the expected file size, and the display control unit 54 displays the number of recordable images on the LCD panel 26.

  According to this, it is possible to always display the number of shots that can be taken according to the shooting situation. Further, the number of shootable images can be displayed even when no file is recorded in the memory card 10.

  Further, in the above embodiment, the RAW image of the through image display is reversibly compressed at regular intervals. However, when the subject does not change, the number of storable images does not change, and the CPU power is only wasted. Become. Therefore, as in the eighth embodiment of the present invention shown in FIG. 23, when the face information of the through image display is detected by the face detection circuit 45 and the number of faces or the occupied area of the face information changes, the through image display The number of shootable images may be obtained by reversibly compressing the RAW image.

  In the through image display, since the high frequency component is eliminated in order to reduce the image size, the calculation accuracy of the recordable number is lowered accordingly. Therefore, for example, the calculation of the average file size according to the first to sixth embodiments and the calculation of the expected file size according to the seventh and eighth embodiments are performed at the same time, based on the larger file size. The number of images that can be shot may be obtained.

  FIG. 24 is a functional block diagram showing functions of the CPU 5 in the ninth embodiment of the present invention. For example, as in the fifth and eighth embodiments, the CPU 5 uses the free space detection unit 50, the file detection unit 51, the average file size calculation unit 52, the recordable number calculation unit 53, the display control unit 54, and the current shooting information acquisition. Unit 80, imaging information extraction unit 81, and expected file size calculation unit 90.

  As shown in FIG. 25, the recordable sheet number calculation from the compressed RAW file recorded in the memory card 10 and the recordable sheet number calculation from the through image display are simultaneously performed by the recordable sheet number calculation unit 53 in parallel. The control unit 54 compares both recordable sheet numbers, and displays the number of recordable sheets based on the smaller recordable sheet number. In the present embodiment, the fifth embodiment and the eighth embodiment are performed simultaneously in parallel. However, the first to sixth embodiments and the seventh and eighth embodiments are appropriately combined. May be. According to this, since the influence due to the elimination of the high-frequency component in the through image display is reduced, it is possible to display the number of shots with higher accuracy.

  In each of the above embodiments, the average file size of the compressed RAW file 12 is calculated. However, the file size of the compressed RAW file at the time of the last still image shooting may be used as the average file size.

  FIG. 26 is a functional block diagram showing functions of the CPU 5 in the tenth embodiment of the present invention. The CPU 5 functions as a free space detection unit 50, a recordable sheet number calculation unit 53, and a display control unit 54, and the EEPROM 7 functions as an average data size recording unit of the present invention.

  As shown in FIG. 27, the EEPROM 7 records the file size of the compressed RAW file 12 of the last still image shooting as an average file size. The recordable number calculation unit 53 calculates the recordable number based on the free space input from the free space detection unit 50 and the average file size read from the EEPROM 7, and the display control unit 54 captures images based on the calculation result. The possible number is displayed on the LCD panel 26.

  When the file in the memory card 10 is deleted, the number of recordable images and the number of shootable images are displayed again. When still image shooting is performed, the recording contents of the EEPROM 7 are updated with the file size of the compressed RAW file generated by the still image shooting as an average file size, and the number of recordable images is calculated again. Display is performed.

  According to this, since the search process for the memory card 10 is limited to the free space, the time required for displaying the number of shootable images can be shortened.

  In the tenth embodiment, the number of shootable images is obtained only from the average file size of the compressed RAW file 12, but the number of shootable images is obtained from the average file size of the RAW file 11 having a larger file size than the compressed RAW file 12. May be.

  As shown in FIG. 26, in the eleventh embodiment of the present invention, the first average file size that is the average file size of the compressed RAW file 12 and the second average file size that is the average file size of the RAW file 11 are stored in the EEPROM 7. Is recorded. These first average file size and second average file size are the file sizes of the compressed RAW file 12 and the RAW file of the still image shooting performed last.

  As shown in FIG. 28, the recordable number calculation unit 53 reads the first average file size from the EEPROM 7, and the first recordable number which is the recordable number of compressed RAW files from the free space detected by the free space detection unit 50. Calculate the number of sheets. When the first recordable number is less than “1”, the display control unit 54 displays on the LCD panel 26 that shooting is not possible.

  When the first recordable number is “1” or more, the second recordable number, which is the recordable number of the compressed RAW file 12, is calculated from the free space and the second average file size. When both the first recordable number and the second recordable number are “1” or more, the number of shots is displayed on the LCD panel 26. Further, when the first recordable number is “1” or more and the second recordable number is less than “1”, the LCD panel 26 is displayed that there is a possibility that the image cannot be taken.

  When the file in the memory card 10 is deleted, the number of recordable images and the number of shootable images are displayed again. In addition, when still image shooting is performed, the recorded contents of the EEPROM 7 are updated with the file size of the compressed RAW file and RAW file generated by the still image shooting as the first average file size and the second average file size, The calculation of the recordable number of sheets and the display of the number of recordable sheets are performed again.

  According to this, the number of shootable images can be displayed only when the image can be reliably taken, and a warning can be given when there is even a possibility that the image cannot be taken.

  The case where each embodiment is implemented individually has been described above, but may be implemented in combination as appropriate. Further, although a digital camera has been described as an example, the present invention can also be applied to a mobile phone or the like with a built-in digital camera.

It is a block diagram which shows the structure of the digital camera of this invention. It is explanatory drawing which shows the file recorded on a memory card. It is explanatory drawing which shows the structure of a compression RAW file. It is a functional block diagram showing the function of CPU of 1st Embodiment. It is a flowchart which shows the procedure which calculates | requires imaging | photography possible number from average file size. It is a flowchart which shows the calculation method of the average file size of 1st Embodiment. It is a functional block diagram showing the function of CPU of 2nd Embodiment. It is explanatory drawing showing the detection period of 2nd Embodiment. It is a flowchart which shows the calculation method of the average file size of 2nd Embodiment. It is a functional block diagram showing the function of CPU of 3rd Embodiment. It is explanatory drawing showing the detection period of 3rd Embodiment. It is a flowchart which shows the calculation method of the average file size of 3rd Embodiment. It is a functional block diagram showing the function of CPU of 4th Embodiment. It is explanatory drawing which shows the structure of a thumbnail image. It is a flowchart which shows the calculation method of the average file size of 4th Embodiment. It is a functional block diagram showing the function of CPU of 5th Embodiment. It is explanatory drawing which shows the structure of header information. It is a flowchart which shows the calculation method of the average file size of 5th Embodiment. It is a functional block diagram showing the function of CPU of 6th Embodiment. It is a flowchart which shows the calculation method of the average file size of 6th Embodiment. It is a functional block diagram showing the function of CPU of 7th Embodiment. It is a flowchart of 7th Embodiment which shows the procedure which calculates | requires the imaging | photography possible number from a through image display. It is a flowchart of 8th Embodiment which shows the procedure which calculates | requires the imaging | photography possible number from a through image display at the time of the change of face information. It is a functional block diagram showing the function of CPU of 9th Embodiment. It is a flowchart of 9th Embodiment which shows the procedure which calculates | requires shootable number from an average file size and a through image. It is a functional block diagram showing the function of CPU of 10th Embodiment. It is a flowchart of 10th Embodiment which shows the procedure which calculates | requires the imaging | photography possible number by making the file size of the last still image imaging | photography into an average file size. It is a flowchart of 11th Embodiment which shows the procedure which calculates | requires imaging | photography possible number from the average file size of a compression RAW file and a RAW file.

Explanation of symbols

2 Digital camera 5 CPU
7 EEPROM
10 memory card 11 RAW file 12 compressed RAW file 13 JPEG file 16 CCD
23 SDRAM
26 LCD panel 31 Lossy compression / decompression circuit 34 Lossless compression / decompression circuit 37 Compressed RAW image 38 Thumbnail image 39 Header information 45 Face detection circuit 50 Free capacity detection unit 51 File detection unit 52 Average file size calculation unit 53 Recordable number calculation unit 54 Display control unit 60 Shooting date and time extraction unit 65 Shooting period extraction unit 70 Quantization table extraction unit 71 Correction coefficient specifying unit 72 Correction unit 77 Quantization table 80 Current shooting information acquisition unit 81 Shooting information extraction unit 85 Face information comparison unit 90 Expected file Size calculator

Claims (22)

Imaging means for capturing a still image and generating a RAW image composed of CCD-RAW data;
Reversible compression processing means for reversibly compressing the RAW image to generate a compressed RAW image;
Recording processing means for recording the compressed RAW image on a recording medium;
Free space detecting means for detecting the free space of the recording medium;
Average data size specifying means for specifying an average data size of the compressed RAW image recorded on the recording medium;
Recordable number calculating means for calculating the number of compressed RAW images that can be recorded on the recording medium based on the free space and the average data size;
A digital camera comprising display control means for causing a display means to display the number of images that can be photographed or the fact that photography is not possible based on the calculation result of the recordable number of sheets calculation means. The average data size specifying means includes a data detection unit for detecting the number of compressed RAW images recorded on the recording medium and a total data size;
The digital camera according to claim 1, further comprising an average data size calculation unit that calculates an average data size of the compressed RAW image from the number of images and the total data size. The average data size specifying unit extracts a shooting date and time from auxiliary information of the compressed RAW image recorded on the recording medium, and selects the compressed RAW image having a shooting date and time corresponding to a preset detection period. A shooting date and time extraction unit to
A data detection unit for detecting the number of selected compressed RAW images and the total data size;
The digital camera according to claim 1, further comprising an average data size calculation unit that calculates an average data size of the compressed RAW image from the number of images and the total data size.   The shooting date and time extracting unit selects the corresponding compressed RAW image by gradually expanding the detection period when the compressed RAW image of the shooting date and time corresponding to the detection period is not recorded on the recording medium. The digital camera according to claim 3. The average data size specifying means extracts the shooting date and time from the supplementary information of the compressed RAW image recorded on the recording medium, and has the shooting date and time corresponding to a plurality of preset detection periods. A shooting period extraction unit for selecting an image;
A data detection unit for detecting the number of compressed RAW images and the total data size within each detection period;
An average data size calculation unit by period for calculating an average data size by period of the compressed RAW image for each detection period from the number of images and the total data size of each detection period;
A weighting unit that weights the average data size for each period according to a time difference from the current date and time;
The average data size calculation unit according to claim 1, further comprising: an average data size calculating unit that calculates an average of the average data size for each period and sets the average data size of the entire compressed RAW image recorded on the recording medium. Digital camera.   The digital camera according to claim 5, wherein the weighting unit reduces the weight as going back from the current date and time to the past. The average data size specifying means includes a data detection unit for detecting the number of compressed RAW images recorded on the recording medium and a total data size;
An average data size calculator that calculates an average data size of the compressed RAW image from the number of images and the total data size;
A quantization table extraction unit that extracts a quantization table used for irreversible compression by reducing the size of the RAW image from the reduced image attached to the compressed RAW image when generating the reduced image; ,
A correction coefficient specifying unit that calculates an average value of high-frequency components of the quantization table and specifies a correction coefficient used for correcting the average data size based on the average value;
The digital camera according to claim 1, further comprising a correction unit that corrects the average data size using the correction coefficient. The average data size specifying unit is configured to display current images such as a shutter speed, an aperture value, and ISO sensitivity from the imaging unit during live view display in which the imaging unit is continuously operated to display an image of a subject in real time on the display unit. A current shooting information acquisition unit for acquiring shooting information;
Shooting information such as shutter speed, aperture value, ISO sensitivity, etc. is extracted from incidental information of the compressed RAW image recorded on the recording medium, and the compressed RAW having shooting information similar to the current shooting information. A shooting information extraction unit for selecting an image;
A data detection unit for detecting the number of selected compressed RAW images and the total data size;
The digital camera according to claim 1, further comprising an average data size calculation unit that calculates an average data size of the compressed RAW image from the number of images and the total data size. The average data size specifying unit records in advance a size ratio such as an image size between the still image shooting and a through image display in which the imaging unit is continuously operated to display a subject image in real time on the display unit. A recorded size ratio recording unit,
The lossless compression processing means reversibly compresses the RAW image at the time of the live view display at a predetermined timing, and the same subject as the live view display is stationary based on the data size and the size ratio of the compressed RAW image obtained at that time. An expected data size calculation unit that calculates an expected data size of a compressed RAW image obtained when an image is captured,
The recordable number calculating means calculates the number of compressed RAW images that can be recorded on the recording medium based on the free capacity and the average data size, and the free capacity and the expected data size.
The display control means causes the display means to display the number of images that can be shot or the fact that shooting is not possible based on the smaller number of recordable sheets based on the average data size and the expected data size. The digital camera according to claim 2, wherein: A face information extracting unit for analyzing the through image of the through image and extracting face information representing a person's face;
The digital camera according to claim 9, wherein the predicted data size calculation unit causes the lossless compression processing unit to losslessly compress the live image of the through image when the face information changes. The average data size specifying unit extracts face information representing a person's face by analyzing the RAW image generated by the imaging unit during the through image display and the compressed RAW image selected by the shooting information extraction unit. A face information extraction unit to
The face information of the through image display is compared with the face information of the compressed RAW image, and the face information of the through image display has the same or approximate any or all of the number, position, occupied area, etc. of the face. A face information comparison unit for selecting a compressed RAW image;
The data detection unit detects the number of compressed RAW images and the total data size selected by the face information comparison unit;
The digital camera according to claim 8, wherein the average data size calculation unit calculates an average data size of the compressed RAW image from the number of images and the total data size.   12. The digital camera according to claim 1, further comprising a recordable number recording unit that records the recordable number of sheets and is updated each time the recordable number of sheets is newly calculated.   The number of recordable sheets is calculated when a new compressed RAW image is recorded on the recording medium or when the recorded compressed RAW image is deleted from the recording medium. Item 13. A digital camera according to Item 12.   The average data size specifying means sets the data size of the RAW image recorded on the recording medium as the average data size when the compressed RAW image is not recorded on the recording medium. The digital camera according to claim 1. An imaging means for generating a RAW image composed of CCD-RAW data at the time of still image shooting and at the time of a through image display for displaying a subject image in real time;
Reversible compression processing means for reversibly compressing the RAW image to generate a compressed RAW image;
Recording processing means for recording a compressed RAW image at the time of still image shooting on a recording medium;
A size ratio recording means in which a size ratio such as an image size between the still image shooting and the through image display is recorded in advance;
The lossless compression processing means reversibly compresses the RAW image at the time of the live view display at a predetermined timing, and the same subject as the live view display is stationary based on the data size and the size ratio of the compressed RAW image obtained at that time. An expected data size calculating means for calculating an expected data size of a compressed RAW image obtained when an image is shot;
Free space detecting means for detecting the free space of the recording medium;
Recordable number calculating means for calculating the number of compressed RAW images that can be recorded on the recording medium based on the expected data size and the free space;
A digital camera comprising display control means for causing a display means to display the number of images that can be photographed or the fact that photography is not possible based on the calculation result of the recordable number of sheets calculation means. Face information extracting means for extracting face information representing a person's face by analyzing a RAW image at the time of the through image display;
16. The digital camera according to claim 15, wherein the reversible compression processing means reversibly compresses the RAW image displayed in the through image when the face information changes. Imaging means for capturing a still image and generating a RAW image composed of CCD-RAW data;
Reversible compression processing means for reversibly compressing the RAW image to generate a compressed RAW image;
Recording processing means for recording the compressed RAW image on a recording medium;
Free space detecting means for detecting the free space of the recording medium;
Average data size recording means for recording an average data size of the compressed RAW image;
A recordable number calculating means for calculating the number of compressed RAW images that can be recorded on the recording medium based on the free space and the average data size;
Based on the calculation result of the recordable number calculating means, the display control means for displaying on the display means the number of images that can be shot or the fact that shooting is not possible,
When the still image shooting is performed, the data size of the compressed RAW image generated by the still image shooting is recorded in the average data size recording unit as a new average data size. camera. Imaging means for capturing a still image and generating a RAW image composed of CCD-RAW data;
Reversible compression processing means for reversibly compressing the RAW image to generate a compressed RAW image;
Recording processing means for recording the compressed RAW image on a recording medium;
Free space detecting means for detecting the free space of the recording medium;
Average data size recording means for recording a first average data size that is an average data size of the compressed RAW image and a second average data size that is an average data size of the RAW image;
Based on the free space and the first average data size, a first recordable number that is the number of compressed RAW images that can be recorded on the recording medium is calculated, and the first recordable number is “1” or more. A recordable sheet number calculating means for calculating a second recordable sheet number, which is the number of compressed RAW images that can be recorded on the recording medium, on the basis of the free space and the second average data size;
When the first recordable number is less than “1”, the display means displays that the image cannot be shot, and when both the first recordable number and the second recordable number are “1” or more, the number of recordable images Is displayed on the display means, and when the first recordable number is “1” or more and the second recordable number is less than “1”, a warning is displayed on the display means that there is a possibility that photographing cannot be performed. Comprising display control means,
When the still image shooting is performed, the data size of the compressed RAW image and the RAW image generated by the still image shooting is the average data size as the new first average data size and second average data size. A digital camera recorded on a recording means. In a control method of a digital camera that performs still image shooting, generates a RAW image composed of CCD-RAW data, and records a compressed RAW image obtained by reversibly compressing the RAW image on a recording medium.
Detecting the free space of the recording medium;
Specifying an average data size of the compressed RAW image recorded on the recording medium;
Calculating the number of compressed RAW images that can be recorded on the recording medium based on the free space and the average data size;
A method for controlling a digital camera, comprising the step of displaying the number of images that can be shot or the fact that shooting is not possible based on the recordable number. A RAW image composed of CCD-RAW data is generated during still image shooting and a through image display for displaying a subject image in real time, and a compressed still image RAW image obtained by reversibly compressing the RAW image is used as a recording medium. In the control method of the digital camera to record,
Detecting the free space of the recording medium;
Reversibly compressing the RAW image at the time of displaying the live view to detect the data size;
A step of calculating an expected data size of a compressed RAW image obtained when a still image of the same subject as that of the through image display is captured from the data size and a size ratio such as an image size between the still image capturing and the through image display. When,
Calculating the number of compressed RAW images that can be recorded on the recording medium based on the free space and the expected data size;
A digital camera control method comprising a step of displaying the number of images that can be photographed or the fact that photographing is impossible based on the calculation result of the recordable number of sheets. In a control method of a digital camera that performs still image shooting, generates a RAW image composed of CCD-RAW data, and records a compressed RAW image obtained by reversibly compressing the RAW image on a recording medium.
Detecting the free space of the recording medium;
Calculating the number of compressed RAW images that can be recorded on the recording medium based on the free space and a preset average data size of the compressed RAW images;
Based on the recordable number of sheets, displaying the number of images that can be photographed or the fact that photography is not possible,
A method for controlling a digital camera, comprising: setting a data size of the compressed RAW image generated by the still image shooting as a new average data size when the still image shooting is performed. In a control method of a digital camera that performs still image shooting, generates a RAW image composed of CCD-RAW data, and records a compressed RAW image obtained by reversibly compressing the RAW image on a recording medium.
Detecting the free space of the recording medium;
A first recordable number of sheets that is the number of compressed RAW images that can be recorded on the recording medium based on the free space and a first average data size that is a predetermined average data size of the compressed RAW images. Calculating steps,
Displaying that the image cannot be taken when the first recordable number is less than “1”;
When the first recordable number of sheets is “1” or more, based on the free space and the second average data size that is a preset average data size of the RAW image, Calculating a second recordable number, which is the number of compressed RAW images that can be recorded;
Displaying the number of shootable images when both the first recordable number and the second recordable number are “1” or more;
Displaying a warning that there is a possibility that shooting may not be possible when the first recordable number is “1” or more and the second recordable number is less than “1”;
A step of setting the compressed RAW image generated by the still image shooting and the file size of the RAW image as new first average data size and second average data size when the still image shooting is performed; A digital camera control method comprising:

Images