JP2005167560A - Electronic camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic camera system for correcting white balance through the comparison between externally measured WB data and internally measured WB data that generates color temperature correction data unique to a lens so as to prevent color slippage due to the lens. <P>SOLUTION: In the electronic camera system characterized in to include: a color temperature correction data calculation means for comparing first and second white balance control signals to calculate color temperature correction data unique to a photographing lens unit; a white balance control means for controlling white balance adjustment on the basis of the first and second white balance control signals and the color temperature correction data; and a color temperature correction data storage means for storing the color temperature correction data, the color temperature correction data calculation means is characterized in to attach information such as identification information acquired from the photographing lens unit to the color temperature correction data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic camera system.

  Conventionally, an electronic camera adjusts the white balance so that a white subject is reproduced in white. White balance sets the spectral characteristics of the most standard lens among the spectral characteristics of commonly used lenses, and the gain of the red signal circuit of the electronic camera obtained from the set spectral characteristics and the light from the subject. The gain of the blue signal circuit is controlled by using the green signal as a reference.

  The white balance includes an auto white balance method and a manual white balance method.

  In the auto white balance method, it is necessary to measure the hue (color temperature) of the shooting environment. In the auto white balance method, there are an external measurement sensor method and a TTL (Through The Lens) method. The external measurement sensor method adjusts the white balance using data obtained by measuring the color of external light. In the TTL method, the color of external light is calculated from the output signal of the image sensor, and white balance is adjusted using the data.

  In the manual white balance method, the photographer determines the type of light source in the shooting environment (for example, sunlight, light bulb, fluorescent lamp, etc.), and selects the type of light source by light source selection means such as a switch. In accordance with the selection of the light source, the gain of the red signal circuit and the gain of the blue signal circuit are set to preset fixed gains specific to the light source. Alternatively, the photographer measures the hue (color temperature) of the shooting environment and inputs the color temperature of the shooting environment using the color temperature input means. The gain of the red signal circuit and the gain of the blue signal circuit are set to a preset fixed gain specific to the color temperature in accordance with the photographer's input of the color temperature.

  However, the conventional lens-replaceable electronic camera has different spectral characteristics depending on the lens used, so even if you set the spectral characteristics of a standard lens and adjust the white balance based on the color temperature information from the subject, you can actually use it. Depending on the interchangeable lens, the spectral characteristics of the interchangeable lens are greatly different from those of the standard lens, and the white balance cannot be accurately adjusted even for the same subject.

  On the other hand, the color temperature correction information corresponding to the spectral characteristics of the photographic lens unit exchangeable with the camera body is created by the photographer and stored in the camera body, and the color temperature correction information is taken at the time of shooting. A video camera and an interchangeable lens capable of exchanging a white balance by performing white balance adjustment based on the above have been proposed (for example, Japanese Patent Application No. 2002-362238).

  However, the conventional method has the following disadvantages.

  Color temperature correction information corresponding to the spectral characteristics of the interchangeable photographic lens unit is created and stored in advance in the camera body, allowing for good white balance adjustment. Since spectral characteristics change depending on the focus position and focal length, the aperture value, focus position, and focal length of the photographic lens unit when creating color temperature correction information stored in advance, and the photographic lens unit When the aperture value, focus position, and focal length are different, accurate white balance adjustment is difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic camera system capable of exchanging a lens, which eliminates the drawbacks as described above and can perform a good white balance adjustment even when the aperture value, focus position, and focal length of a photographing lens unit change. And

In order to achieve the above object, the first invention according to the present application provides:
An interchangeable photographic lens unit, an image sensor that photoelectrically converts a subject image formed through the photographic lens unit, and white balance adjustment using data from colorimetric sensors other than the image sensor A first white balance calculation means for obtaining a first white balance control signal and a second white balance control signal for white balance adjustment are obtained using data from a signal obtained from an image sensor through the photographing lens unit. A second white balance calculating means; the first white balance control signal obtained from the first white balance calculating means; and the second white balance control signal obtained from the second white balance calculating means. In comparison, the color temperature correction data specific to the photographing lens unit is calculated, and the color temperature correction data is calculated. Data calculating means, white balance control means for controlling white balance adjustment based on the first white balance control signal, the second white balance control signal, and the color temperature correction data, and a color for storing the color temperature correction data. In the electronic camera system, the color temperature correction data calculation unit includes identification information acquired from the photographing lens unit, and an aperture value, a focus position, and a focus at the time of data creation. The distance information is attached to the color temperature correction data.

  With the above configuration, the photographer can use the color temperature correction data corresponding to the spectral characteristics specific to the interchangeable photographic lens unit attached to the electronic camera, the identification information of the photographic lens unit, and the aperture value of the photographic lens unit at the time of data creation. It is possible to create color temperature correction data to which information on the focus position / focal length is attached.

In order to achieve the above object, the second invention according to the present application provides:
In the first invention according to the present application, the color temperature correction data storage means stores color temperature correction data unique to an interchangeable photographic lens unit for each value of aperture value, focus position, and focal length. To do.

  With the above configuration, a plurality of color temperature correction data specific to the photographing lens unit can be stored in the electronic camera for each value of aperture value, focus position, and focal length when creating color temperature correction data.

In order to achieve the above object, the third invention according to the present application provides:
In the second invention according to the present application, from among the plurality of color temperature correction data stored in the color temperature correction data storage means, an aperture value, a focus position, A color temperature correction data automatic selection means for automatically selecting color temperature correction data created at the focal length is provided.

With the above configuration,
In shooting using color temperature correction data, the photographer was created under the same conditions as the aperture value, focus position, and focal length of the photographic lens unit even if the aperture value, focus position, and focal length of the photographic lens unit changed. There is no need to select color temperature correction data, and the electronic camera can automatically select the data.

In order to achieve the above object, a fourth invention according to the present application provides:
In the first invention according to the present application, when the color temperature correction data created under the same conditions as the state of the photographing lens unit at the time of photographing is not stored in the color temperature correction data storage means, A color temperature correction data selection warning means for warning is provided.

  With the above configuration, it is possible to warn the photographer when there is no color temperature correction data created under the same conditions as the aperture value, focus position, and focal length at the time of photographing of the mounted photographing lens unit.

In order to achieve the above object, a fifth invention according to the present application provides:
In the third invention according to the present application, the color temperature correction data automatic selection means stores color temperature correction data created under the same conditions as the state of the photographing lens unit at the time of photographing in the color temperature correction data storage means. If not, the color temperature correction data created under the conditions closest to the state of the photographing lens unit at the time of photographing is automatically selected.

  With the above configuration, if there is no color temperature correction data created under the same conditions as the aperture value, focus position, and focal length at the time of shooting with the mounted shooting lens unit, the aperture value and focus of the shooting lens unit at the time of shooting Shooting using color temperature correction data created under conditions closest to the position / focal length conditions becomes possible.

As described above, according to the invention shown in claim 1,
The photographer can create color temperature correction data with information on the aperture value, focus position, and focal length of the attached photographic lens unit, and the aperture value, focus position, and focal length of the attached photographic lens unit. By using the color temperature correction data created under the same conditions as those described above, it is possible to obtain an image with good white balance adjustment.

Further, according to the invention shown in claim 2,
Even if the aperture value, focus position, and focal length of the mounted lens unit change during shooting, color temperature correction data with the same conditions as the aperture value, focus position, and focal length of the mounted lens unit during shooting Can be used.

Further, even if the aperture value / focus position / focal length of the mounted lens unit changes during shooting according to the invention described in claim 3, the aperture value / focus position / focus at the time of shooting of the mounted lens unit. It is not necessary for the photographer to arbitrarily select the color temperature correction data created under the same conditions as the distance, and the electronic camera body can automatically select it.

Further, according to the invention shown in claim 4,
Color temperature created under the same conditions as the aperture value, focus position, and focal length of the attached lens unit when shooting using the color temperature correction data of the attached lens unit It is possible to notify the photographer that photographing using the correction data cannot be performed.

Further, according to the invention shown in claim 5,
Color temperature correction created under the same conditions as the aperture value, focus position, and focal length at the time of shooting of the mounted lens unit when shooting using the color temperature correction data of the mounted lens unit Mounted lens when data is not saved and shooting using color temperature correction data created under the same conditions as the aperture value, focus position, and focal length at the time of shooting of the mounted lens unit is not possible By using the color temperature correction data created under the conditions closest to the aperture value, focus position, and focal length conditions at the time of shooting from the color temperature correction data of the unit, the color temperature correction data of the mounted lens unit can be obtained. Shooting using it becomes possible.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic diagram of the present invention.

  Reference numeral 100 denotes an electronic camera body.

  Reference numeral 300 denotes an interchangeable lens unit.

  151 is a colorimetric sensor, which measures the color temperature of external light.

  FIG. 2 is a block diagram showing a first embodiment of the present invention.

  In FIG. 2, reference numeral 100 denotes an electronic camera body.

  Reference numeral 12 denotes a shutter for controlling the amount of exposure to the image sensor 14, and reference numeral 14 denotes an image sensor that converts an optical image into an electrical signal.

  The light beam incident on the lens 310 can be guided through the diaphragm 312, the lens mounts 306 and 106, the mirror 130, and the shutter 12 by the single-lens reflex method, and can be formed on the image sensor 14 as an optical image.

  Reference numerals 130 and 132 denote mirrors that can guide the light beam incident on the lens 310 to the optical viewfinder 104 by a single-lens reflex system.

  The mirror 130 may be either a quick return mirror or a half mirror.

  Reference numeral 16 denotes an A / D converter that converts an analog signal output of the image sensor 14 into a digital signal.

  A timing generation circuit 18 supplies a clock signal and a control signal to the image sensor 14, the A / D converter 16, and the D / A converter 26, and is controlled by the memory control circuit 22 and the system control circuit 50.

  An image processing circuit 20 performs predetermined pixel interpolation processing and color conversion processing on the data from the A / D converter 16 or the data from the memory control circuit 22.

  Further, the image processing circuit 20 performs predetermined calculation processing using the captured image data as necessary, and the system control circuit 50 performs shutter control means 40 and distance measurement control means based on the obtained calculation result. TTL (through-the-lens) AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash light control) processing can be performed.

  Further, the image processing circuit 20 performs WB (white balance) processing based on the calculation result obtained from the white balance control circuit 156.

  A memory control circuit 22 controls the A / D converter 16, the timing generation circuit 18, the image processing circuit 20, the image display memory 24, the D / A converter 26, the memory 30, and the compression / decompression circuit 32.

  The data of the A / D converter 16 is written into the image display memory 24 or the memory 30 via the image processing circuit 20 and the memory control circuit 22 or the data of the A / D converter 16 is directly passed through the memory control circuit 22. It is.

  Reference numeral 24 denotes an image display memory, 26 denotes a D / A converter, and 28 denotes an image display unit composed of a TFT / LCD. The display image data written in the image display memory 24 passes through the D / A converter 26. Are displayed by the image display unit 28.

  If the image data captured using the image display unit 28 is sequentially displayed, the electronic viewfinder function can be realized.

  The image display unit 28 can arbitrarily turn on / off the display according to an instruction from the system control circuit 50. When the display is turned off, the power consumption of the electronic camera body 100 can be greatly reduced. I can do it.

  Reference numeral 30 denotes a memory for storing captured still images and moving images, and has a sufficient storage capacity to store a predetermined number of still images and a predetermined time of moving images.

  Thereby, even in the case of continuous shooting or panoramic shooting in which a plurality of still images are continuously shot, it is possible to write a large amount of images to the memory 30 at high speed.

  The memory 30 can also be used as a work area for the system control circuit 50.

  A compression / decompression circuit 32 compresses and decompresses image data by adaptive discrete cosine transform (ADCT) or the like, reads an image stored in the memory 30, performs compression processing or decompression processing, and stores the processed data in the memory 30. Write to.

  Reference numeral 40 denotes shutter control means for controlling the shutter 12 in cooperation with the aperture control means 340 for controlling the aperture 312 based on photometric information from the photometry means 46.

  Reference numeral 42 denotes a distance measuring means for performing AF (autofocus) processing, and a light beam incident on the lens 310 is converted into an aperture 312, lens mounts 306 and 106, a mirror 130, and a distance measuring sub mirror (not shown) by a single-lens reflex system. , The in-focus state of the image formed as an optical image can be measured.

  Reference numeral 46 denotes a photometric means for performing AE (automatic exposure) processing, and a light beam incident on the lens 310 is converted into a diaphragm 312, lens mounts 306 and 106, mirrors 130 and 132, and a photometric lens (not shown) by a single-lens reflex system. Then, the exposure state of the image formed as an optical image can be measured.

  The photometry means 46 also has an EF (flash dimming) processing function in cooperation with the flash 48.

  A flash 48 has an AF auxiliary light projecting function and a flash light control function.

  The system control circuit 50 controls the shutter control unit 40, the aperture control unit 340, and the distance measurement control unit 342 based on the calculation result obtained by calculating the image data captured by the image sensor 14 by the image processing circuit 20. It is also possible to perform exposure control and AF (autofocus) control using the video TTL method.

  Further, AF (autofocus) control may be performed using both the measurement result by the distance measuring means 42 and the calculation result obtained by calculating the image data captured by the image sensor 14 by the image processing circuit 20.

  Then, exposure control may be performed using both the measurement result obtained by the photometry unit 46 and the calculation result obtained by calculating the image data captured by the image sensor 14 by the image processing circuit 20.

  Reference numeral 50 denotes a system control circuit that controls the entire electronic camera body 100, and reference numeral 52 denotes a memory that stores constants, variables, programs, and the like for operation of the system control circuit 50.

  Reference numeral 54 denotes a display unit such as a liquid crystal display device or a speaker that displays an operation state or a message using characters, images, sounds, or the like in accordance with execution of a program in the system control circuit 50. One or a plurality of places are provided near the portion where they are easily visible, and are configured by a combination of, for example, an LCD, an LED, a sound generation element, and the like.

  In addition, the display unit 54 is partially installed in the optical viewfinder 104.

  Among the display contents of the display unit 54, what is displayed on the LCD or the like is, for example, single shot / continuous shooting display, self-timer display, compression rate display, recording pixel number display, recording number display, remaining image number display , Shutter speed display, Aperture value display, Exposure compensation display, Flash display, Red-eye reduction display, Macro shooting display, Buzzer setting display, Clock battery level display, Battery level display, Error display, Multi-digit number information display , Attachment / detachment state display of the recording media 200 and 210, attachment / detachment state display of the lens unit 300, communication I / F operation display, date / time display, display showing a connection state with an external computer, and the like.

  In addition, among the display contents of the display unit 54, what is displayed in the optical viewfinder 104 is, for example, in-focus display, shooting preparation completion display, camera shake warning display, flash charge display, flash charge completion display, shutter speed display, There are an aperture value display, an exposure correction display, a recording medium writing operation display, and the like.

  Further, among the display contents of the display unit 54, what is displayed on the LED or the like includes, for example, in-focus display, photographing preparation completion display, camera shake warning display, camera shake warning display, flash charge display, flash charge completion display, recording medium There are a writing operation display, a macro shooting setting notification display, a secondary battery charge state display, and the like.

  And what is displayed on a lamp etc. among the display contents of the display part 54 includes a self-timer notification lamp, for example. This self-timer notification lamp may be used in common with AF auxiliary light.

  Reference numeral 56 denotes an electrically erasable / recordable nonvolatile memory such as an EEPROM.

  Reference numerals 60, 62, 64, 66, 68, 70, and 72 are operation means for inputting various operation instructions of the system control circuit 50, such as switches, dials, touch panels, pointing by line-of-sight detection, voice recognition devices, and the like. Consists of a single or a plurality of combinations.

  Here, a specific description of these operating means will be given.

  Reference numeral 60 denotes a mode dial switch, which is an automatic shooting mode, program shooting mode, shutter speed priority shooting mode, aperture priority shooting mode, manual shooting mode, depth of focus priority (depth) shooting mode, portrait shooting mode, landscape shooting mode, and close-up shooting. Each function shooting mode such as a mode, a sports shooting mode, a night view shooting mode, and a panorama shooting mode can be switched and set.

  Reference numeral 62 denotes a shutter switch SW1, which is turned ON during operation of a shutter button (not shown), and performs operations such as AF (autofocus) processing, AE (automatic exposure) processing, WB (white balance) processing, and EF (flash dimming) processing. Instruct the start.

  Reference numeral 64 denotes a shutter switch SW2, which is turned on when the operation of a shutter button (not shown) is completed, and an exposure process for writing a signal read from the image sensor 12 to the memory 30 via the A / D converter 16 and the memory control circuit 22. Development processing using operations in the image processing circuit 20 and the memory control circuit 22, recording processing for reading image data from the memory 30, compression in the compression / decompression circuit 32, and writing the image data to the recording medium 200 or 210. Instructs the start of a series of processing operations.

  Reference numeral 66 denotes a color temperature correction data registration switch, which instructs the start of a shooting sequence for calculating color temperature correction data unique to the lens unit 300 mounted by the color temperature correction data calculation circuit 155.

  Reference numeral 68 denotes a color temperature correction mode switch for instructing photographing using the color temperature correction data unique to the mounted lens unit 300 calculated by the color temperature correction data calculation circuit 155.

  Reference numeral 70 denotes an automatic color temperature correction data selection means, which is created from a plurality of color temperature correction data stored in the color temperature correction data storage means 157 under the same or closest conditions as the lens unit 300 mounted. Color temperature correction data is selected automatically.

  A white balance selection switch 72 is an external measuring sensor method using color temperature data obtained by measuring the color of external light, and a TTL that calculates the color of external light from the output signal of the image sensor and uses the color temperature data. The photographer determines the auto white balance that adjusts the white balance according to the method and the type of light source in the shooting environment (for example, sunlight, light bulb, fluorescent lamp, etc.), and selects the type of light source by the light source selection means (not shown) Or, the photographer measures the hue (color temperature) of the shooting environment, inputs the color temperature of the shooting environment to the electronic camera by the color temperature input means, and selects the light source and the red signal circuit according to the input of the color temperature. And a manual white balance set to a fixed light source and a fixed gain specific to the color temperature are selected.

  74 is an operation unit including various buttons, a touch panel, etc., a menu button, a set button, a macro button, a multi-screen playback page break button, a flash setting button, a single shooting / continuous shooting / self-timer switching button, a menu movement + (plus). Button, menu shift-(minus) button, playback image shift + (plus) button, playback image-(minus) button, shooting quality selection button, exposure compensation button, date / time setting button, panorama mode shooting and playback Selection / switching button for setting selection and switching of various functions at the time of execution, determination / execution button for setting determination and execution of various functions at the time of executing shooting and playback in panorama mode, etc., ON of the image display unit 28 Image display ON / OFF switch to set / OFF, image data taken immediately after shooting A quick review ON / OFF switch for setting a quick review function for automatic playback, a switch for selecting a compression rate of JPEG compression, or a CCD RAW mode for digitizing an image sensor signal and recording it on a recording medium. If you press the playback switch that can set each function mode such as compression mode switch, playback mode, multi-screen playback / erase mode, PC connection mode, etc. For example, there is an AF mode setting switch that can set a one-shot AF mode that keeps the in-focus state and a servo AF mode that keeps autofocusing continuously while the shutter switch SW1 is pressed.

  In addition, the functions of the plus button and the minus button can be selected more easily by providing a rotary dial switch.

  Reference numeral 76 denotes a power switch that can switch and set the power-on and power-off modes of the electronic camera body 100. In addition, the power on and power off settings of various accessory devices such as the lens unit 300 connected to the electronic camera body 100, an external strobe (not shown), and the recording media 200 and 210 can also be switched.

  Reference numeral 80 denotes a power supply control means, which includes a battery detection circuit, a DC-DC converter, a switch circuit for switching a block to be energized, etc., and detects the presence / absence of a battery, the type of battery, the remaining battery level, and the detection result In addition, the DC-DC converter is controlled based on an instruction from the system control circuit 50, and a necessary voltage is supplied to each unit including the recording medium for a necessary period.

  Reference numeral 82 denotes a connector, 84 denotes a connector, and 86 denotes a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Li battery, an AC adapter, or the like.

  90 and 94 are interfaces with a recording medium such as a memory card or a hard disk, 92 and 96 are connectors for connecting to a recording medium such as a memory card or a hard disk, and 98 is a recording medium 200 or 210 attached to the connector 92 or 96. Recording medium attachment / detachment detecting means for detecting whether or not the recording medium is present.

  In this embodiment, it is assumed that there are two interfaces and connectors for attaching the recording medium. Of course, the interface and the connector for attaching the recording medium may have a single or a plurality of systems and any number of systems. Moreover, it is good also as a structure provided with combining the interface and connector of a different standard.

  The interface and the connector may be configured using a PCMCIA card, a CF (Compact Flash (R)) card, or the like that conforms to a standard.

  Further, when the interfaces 90 and 94 and the connectors 92 and 96 are configured using a PCMCIA card or a CF (Compact Flash (R)) card or the like, a LAN card, a modem card, a USB card, an IEEE 1394 card are used. By connecting various communication cards such as P1284 card, SCSI card, PHS and other communication cards, image data and management information attached to the image data can be transferred to and from peripheral devices such as other computers and printers. Can fit.

  Reference numeral 104 denotes an optical viewfinder, which can guide and display a light beam incident on the lens 310 through an aperture 312, lens mounts 306 and 106, and mirrors 130 and 132 as an optical image by a single lens reflex system. As a result, it is possible to perform shooting using only the optical viewfinder 104 without using the electronic viewfinder function of the image display unit 28. In the optical viewfinder 104, some functions of the display unit 54, for example, a focus display, a camera shake warning display, a flash charge display, a shutter speed display, an aperture value display, an exposure correction display, and the like are installed.

  A communication unit 110 has various communication functions such as RS232C, USB, IEEE1394, P1284, SCSI, modem, LAN, and wireless communication.

  Reference numeral 112 denotes a connector for connecting the electronic camera body 100 to another device by the communication unit 110 or an antenna in the case of wireless communication.

  120 is an interface for connecting the electronic camera body 100 to the lens unit 300 in the lens mount 106, 122 is a connector for electrically connecting the electronic camera body 100 to the lens unit 300, and 124 is the lens mount 106 and / or the connector. Reference numeral 122 denotes lens attachment / detachment detection means for detecting whether or not the lens unit 300 is attached.

  The connector 122 transmits a control signal, a status signal, a data signal, and the like between the electronic camera main body 100 and the lens unit 300, and also has a function of supplying currents of various voltages. The connector 122 may be configured to transmit not only electrical communication but also optical communication, voice communication, and the like.

  Reference numeral 151 denotes a colorimetric sensor, which measures the color of external light in order to adjust the white balance of the photographed image.

  An A / D converter 152 converts the analog signal output of the colorimetric sensor 151 into a digital signal.

  An external measurement white balance calculation circuit 153 receives the output from the white balance A / D circuit 56 and calculates the color temperature of external light.

  An internal measurement white balance calculation circuit 154 calculates a color temperature using image data captured by the TTL method.

  Reference numeral 155 denotes a color temperature correction data calculation circuit which compares the external color measurement temperature calculated by the external measurement white balance calculation circuit 153 with the internal color measurement temperature calculated by the internal measurement white balance calculation circuit 154 and is attached. Color temperature correction data corresponding to the spectral characteristics unique to the lens unit 300 is calculated, and the aperture value, focus position, and focus of the lens unit 300 when the color correction data acquired from the lens unit 300 is created are calculated as the calculated color temperature correction data. Attach distance information.

  A white balance control circuit 156 is a white balance adjustment gain set in advance according to the light source selection and color temperature input by the photographer, the external color measurement temperature calculated by the external measurement white balance calculation circuit 153, and the internal measurement. Based on the internal colorimetric temperature calculated by the white balance calculation circuit 154 and the color temperature correction data calculated by the color temperature correction data calculation circuit 155, the white balance necessary for the image processing circuit 20 to perform white balance processing. Correction data is calculated.

  A color temperature correction data storage unit 157 stores a plurality of color temperature correction data specific to the mounted lens unit 300 for each value of the aperture value, the focus position, and the focal length of the lens unit 300.

  Reference numeral 160 denotes a warning unit. When the photographing method to be used by the color temperature correction data is selected by the color temperature correction mode switch 68, the color temperature correction data unique to the lens unit 300 mounted on the color temperature correction data storage unit 157 is selected. Is stored, the color temperature correction data is not stored, and shooting using the color temperature correction data is impossible, and the aperture value, focus position, and focus of the lens unit 300 at the time of shooting If the color temperature correction data created under the same condition as the distance is not stored, the display unit 54 warns the photographer that the color temperature correction data cannot be used.

  Reference numeral 200 denotes a recording medium such as a memory card or a hard disk.

  The recording medium 200 includes a recording unit 202 composed of a semiconductor memory, a magnetic disk, or the like, an interface 204 with the electronic camera body 100, and a connector 206 for connecting with the electronic camera body 100.

  Reference numeral 210 denotes a recording medium such as a memory card or a hard disk.

  The recording medium 210 includes a recording unit 212 composed of a semiconductor memory, a magnetic disk, or the like, an interface 214 with the electronic camera body 100, and a connector 216 for connecting with the electronic camera body 100.

  Reference numeral 300 denotes an interchangeable lens type lens unit.

  Reference numeral 306 denotes a lens mount that mechanically couples the lens unit 300 to the electronic camera body 100. The lens mount 306 includes various functions for electrically connecting the lens unit 300 to the electronic camera body 100.

  Reference numeral 310 denotes a photographing lens, and 312 denotes an aperture.

  Reference numeral 320 denotes an interface for connecting the lens unit 300 to the electronic camera body 100 in the lens mount 306, and 322 denotes a connector for electrically connecting the lens unit 300 to the electronic camera body 100.

  The connector 322 transmits a control signal, a status signal, a data signal, and the like between the electronic camera body 100 and the lens unit 300, and also has a function of supplying or supplying currents of various voltages. The connector 322 may be configured to transmit not only electrical communication but also optical communication, voice communication, and the like.

  Reference numeral 340 denotes an aperture control unit that controls the aperture 312 in cooperation with the shutter control unit 40 that controls the shutter 12 based on photometric information from the photometry unit 46.

  Reference numeral 342 denotes distance measurement control means for controlling the focusing of the photographing lens 310, and reference numeral 344 denotes zoom control means for controlling zooming of the photographing lens 310.

  A lens system control circuit 350 controls the entire lens unit 300. The lens system control circuit 350 includes a memory for storing operation constants, variables, programs and the like, identification information such as a number unique to the lens unit 300, management information, function information such as an open aperture value, a minimum aperture value, a focal length, It also has a non-volatile memory function for holding current and past set values.

  FIG. 3 shows a flowchart for creating color temperature correction data of the mounted lens.

  First, in step S101, when the color temperature correction data registration switch 66 is turned on, a color temperature correction data creation mode for creating color temperature correction data unique to the lens unit 300 attached to the electronic camera body 100 is entered.

In step S102, when the shutter switch SW1 (62) is turned on, in step S103, the colorimetric sensor 151 performs color measurement of the external light, and the analog output from the colorimetric sensor 151 is output by the A / D circuit 152. From the ratio of the red signal R ₁ and the blue signal B ₁ converted into a digital signal and obtained from the colorimetric sensor 151, the external measurement white balance calculation circuit 153 converts the color temperature of the external light to R ₁ / G ₁ and B ₁ / G. _{Get one} .

  When the shutter switch SW2 (64) is turned on in step S104, the photographer photographs a predetermined blank sheet in step S105.

In step S <b> 106, the image sensor 14 receives the light transmitted through the attached lens unit 300, converts the analog signal output from the image sensor 14 into a digital signal by the A / D converter 16, and obtains it from the image sensor 14. from obtained red signal _{R 2} and the ratio of the blue signal _{B 2,} to obtain a _R 2 / _{G 2} and _B 2 / _{G 2} a lens unit 300 by the inner measuring white balance calculation circuit 154 as the color temperature of the transmitted external light.

In step S107, the color temperature R ₁ / G ₁ and B ₁ / G _{1 of} the external light obtained by the external measurement white balance calculation circuit 153 and the lens unit 300 obtained by the internal measurement white balance calculation circuit 154 are obtained. Based on the color temperatures R ₂ / G ₂ and B ₂ / G _{2 of the} transmitted external light, the color temperature correction data calculation circuit 155 performs color temperature correction data R ₃ / G ₃ and B corresponding to the spectral characteristics unique to the lens unit 300. ₃ / _{G 3} is calculated.

  In step S108, the lens system control circuit 350 of the lens unit 300 acquires information on the aperture value, the focus position, and the focal length when creating the color temperature correction data.

In step S109, the color temperature correction data R ₃ / G ₃ and B ₃ / G ₃ unique to the lens unit 300 obtained from the color temperature correction data calculation circuit 155 are obtained from the lens system control circuit 350 of the lens unit 300. The identification information such as the number unique to the lens unit 300, management information, and information on the aperture value, focus position, and focal length at the time of color temperature data creation are stored in the color temperature correction data storage means 157.

  FIG. 4 shows a flowchart of photographing using color temperature correction data unique to the attached lens unit 300.

  First, when the shutter switch SW1 (62) is turned on in step S201, it is determined in step S202 whether the white balance processing is auto white balance or manual white balance by operating the white balance selection switch 72.

  If auto white balance has been selected, in step S203, the colorimetric sensor 151 measures the color of external light, and the analog signal output from the colorimetric sensor 151 is digitally converted by the A / D converter 152. The external measurement white balance calculation circuit 153 calculates the gain of external measurement white balance adjustment from the ratio of the red signal R and the blue signal B obtained by conversion to a signal and obtained from the color measurement sensor 151.

  When the shutter switch SW2 (64) is turned on in step S204, image data is stored in the image sensor 14 in step S205.

  In step S206, the analog signal output from the image sensor 14 is converted into a digital signal by the A / D converter 16, and an internal white balance calculation circuit is calculated from the ratio of the red signal R and the blue signal B obtained from the captured image data. By 154, the gain of the internal measurement white balance adjustment is calculated.

  In step S209, the white balance control circuit 156 receives identification information such as a number unique to the lens unit 300, management information, and the aperture value, focus position, and focal length at the time of shooting from the lens system control circuit 350 of the mounted lens unit 300. Get information.

  In step S210, the white balance control circuit 156 detects identification information such as a number unique to the lens unit 300 obtained from the lens system control circuit 350 of the mounted lens unit 300, management information, and an aperture value, focus position, Based on the focal length information, the color temperature correction data stored in the same conditions as the aperture value, focus position, and focal length at the time of shooting, which are specific to the mounted lens unit 300, are read from the color temperature correction data storage unit 157. .

  In step S211, the white balance control circuit 156 corrects the white balance correction value of the photographed image calculated based on the gain of the external measurement white balance adjustment, the gain of the internal measurement white balance, and the color temperature correction data specific to the attached lens unit 300. Is sent to the image processing circuit 20 to adjust the white balance of the photographed image.

  In step S212, together with the image data, the color temperature correction data specific to the attached lens unit 300 is stored in the recording unit 202 or the recording unit 212 as various types of shooting information accompanying the shot image.

  In step S202, when manual white balance is selected by operating the white balance selection switch 72, when the shutter switch SW2 (64) is turned on in step S207, image data is accumulated in the image sensor 14 in step S208. The analog signal output from the image sensor 14 is converted into a digital signal by the A / D converter 16.

  In step S209, the white balance control circuit 156 stores the color temperature correction data based on identification information such as a unique number of the lens unit 300 obtained from the lens system control circuit 350 of the mounted lens unit 300, and various information such as management information. The means 157 reads color temperature correction data specific to the mounted lens unit 300. In step S209, the white balance control circuit 156 receives identification information such as a number unique to the lens unit 300, management information, and the aperture value, focus position, and focal length at the time of shooting from the lens system control circuit 350 of the mounted lens unit 300. Get information.

  In step 210, the white balance control circuit 156 identifies identification information such as a number unique to the lens unit 300 obtained from the lens system control circuit 350 of the lens unit 300 attached, management information, and the aperture value, focus position, Based on the focal length information, the color temperature correction data stored in the same conditions as the aperture value, focus position, and focal length at the time of shooting, which are specific to the mounted lens unit 300, are read from the color temperature correction data storage unit 157. .

  In step S211, the white balance control circuit 156 corrects the white balance correction value of the photographed image calculated based on the gain of the external measurement white balance adjustment, the gain of the internal measurement white balance, and the color temperature correction data specific to the attached lens unit 300. Is sent to the image processing circuit 20 to adjust the white balance of the photographed image.

  When the color temperature correction data created under the same conditions as the aperture value, focus position, and focal length at the time of photographing unique to the mounted lens unit 300 are not stored in the color temperature correction data storage unit 157 in step 210 In step S213, the white balance control circuit 156 determines identification information such as a unique number of the lens unit 300 obtained from the lens system control circuit 350 of the mounted lens unit 300, management information, and an aperture value at the time of shooting. Based on the information on the focus position / focal length, the color created from the color temperature correction data storage means 157 under the conditions closest to the conditions of the aperture value, focus position, and focal length at the time of shooting specific to the mounted lens unit 300 Read temperature correction data.

  In step S214, since the photographer cannot perform shooting using the color temperature correction data created under the same conditions as the aperture value, focus position, and focal length at the time of shooting unique to the lens unit 300 to which the camera is attached, the warning unit 160 warns the user. Then, it is displayed on the display unit 54 that the color temperature correction data created under the same conditions as the aperture value, focus position, and focal length at the time of shooting are not used.

  FIG. 5 shows a lens unit 300 in which the color temperature correction data is not stored in the color temperature data storage unit 157, and a lens system control circuit 350 that stores various lens information such as identification information such as a number unique to the lens unit 300 and management information. 6 is a flowchart of color temperature data selection and warning operations when a lens unit 300 having no lens is attached to the electronic camera body 100.

  First, when the color temperature correction mode switch 68 is turned on in step S301, in step S302, the white balance control circuit 157 identifies identification information such as a number unique to the lens unit 300 from the lens system control circuit 350 of the mounted lens unit 300. Read various lens information such as management information.

  In step S303, the white balance control circuit 156 corrects the color temperature based on various lens information such as identification information such as a number unique to the lens unit 300 and management information obtained from the lens system control circuit 350 of the mounted lens unit 300. The data storage means 157 is searched for color temperature correction data specific to the mounted lens unit 300.

  If the color temperature correction data specific to the lens unit 300 attached in step S303 is stored in the color temperature correction data storage unit 157, the photographer obtains color temperature correction data specific to the attached lens unit in step S306. The used photographing becomes possible, and the processing shifts to a photographing sequence using the color temperature correction data unique to the lens unit 300 to which the lens unit 300 is attached as shown in FIG.

  If the color temperature correction data of the lens unit 300 mounted in step S303 is not stored in the color temperature correction data storage unit 157, the photographer uses the mounted lens unit 300 and is unique to the mounted lens unit 300. Since the photographing using the color temperature correction data cannot be performed, in step S305, the warning unit 160 warns the user and displays on the display unit 54 that the color temperature correction data cannot be used.

  When various lens information such as identification information such as a number unique to the lens unit 300 and management information are not obtained from the lens system control circuit 350 of the lens unit 300 mounted in step S302, color temperature correction data is obtained in step S304. The use warning means 160 warns the photographer that the color temperature correction data could not be retrieved and displays it on the display unit 54.

It is the schematic of the electronic camera system which shows the Example of this invention. It is the block diagram which showed the internal structure of the electronic camera system which shows the Example of this invention. FIG. 5 is a flowchart for creating color temperature correction data of a mounted lens unit 300 in an embodiment of the present invention. In the embodiment of the present invention, a flowchart of photographing using the color temperature correction data of the mounted lens unit 300 is shown. In the embodiment of the present invention, the lens unit 300 in which the color temperature correction data is not stored in the color temperature data storage means, or the lens unit 300 that does not have the lens system control circuit 350 in which various lens information such as the lens ID is stored, is an electronic camera. 6 is a flowchart of color temperature data selection and warning operations when the main body 100 is mounted.

Explanation of symbols

14 Image sensor 16 A / D converter 20 Image processing circuit 50 System control circuit 54 Display unit 62 Release shutter switch SW1
64 Release shutter switch SW2
66 Color temperature correction data registration switch 68 Color temperature correction mode switch 70 Color temperature correction data automatic selection means 72 White balance selection switch 100 Electronic camera body 151 Color measurement sensor 152 A / D converter 153 External measurement white balance calculation circuit 154 Internal measurement White balance calculation circuit 155 Color temperature correction data calculation circuit 156 White balance control circuit 157 Color temperature correction data storage means 160 Color temperature correction data automatic selection warning means 200 Recording medium 210 Recording medium 300 Lens unit 350 Lens system control circuit

Claims (5)

  An interchangeable photographic lens unit, an image sensor that photoelectrically converts a subject image formed through the photographic lens unit, and white balance adjustment using data from colorimetric sensors other than the image sensor A first white balance calculation means for obtaining a first white balance control signal and a second white balance control signal for white balance adjustment are obtained using data from a signal obtained from an image sensor through the photographing lens unit. A second white balance calculating means; the first white balance control signal obtained from the first white balance calculating means; and the second white balance control signal obtained from the second white balance calculating means. In comparison, the color temperature correction data specific to the photographing lens unit is calculated, and the color temperature correction data is calculated. Data calculating means, white balance control means for controlling white balance adjustment based on the first white balance control signal, the second white balance control signal, and the color temperature correction data, and a color for storing the color temperature correction data. In the electronic camera system, the color temperature correction data calculation unit includes identification information acquired from the photographing lens unit, and an aperture value, a focus position, and a focus at the time of data creation. An electronic camera system, wherein distance information is attached to the color temperature correction data.   2. The electronic camera system according to claim 1, wherein the color temperature correction data storage means stores color temperature correction data specific to the interchangeable photographic lens unit for each value of aperture value, focus position, and focal length. .   Color temperature correction data created from the plurality of color temperature correction data stored in the color temperature correction data storage means with the same aperture value, focus position, and focal length as the state of the photographing lens unit at the time of shooting 3. The electronic camera system according to claim 2, further comprising color temperature correction data automatic selection means for automatically selecting a color temperature correction data.   Color temperature correction data selection warning means for warning the photographer when color temperature correction data created under the same conditions as the state of the photographing lens unit at the time of photographing is not stored in the color temperature correction data storage means The electronic camera system according to claim 1, further comprising:   The color temperature correction data automatic selection unit is configured to perform shooting at the time of shooting when the color temperature correction data created under the same conditions as the state of the shooting lens unit at the time of shooting is not stored in the color temperature correction data storage unit. 4. The electronic camera system according to claim 3, wherein the color temperature correction data created under a condition closest to the state of the lens unit is automatically selected.

Images