JP2006033159A - Electronic camera system - Google Patents

Abstract

Provided is an electronic camera system capable of exchanging a lens that can perform a good white balance adjustment even when it is difficult to create color temperature correction data under the same conditions as shooting conditions immediately before shooting.
An interchangeable photographic lens unit, an image sensor, a first white balance calculating means, a second white balance calculating means, a color temperature correction data calculating means, a white balance control means, Color temperature correction data composition for synthesizing a plurality of color temperature correction data and calculating combined color temperature correction data in an electronic camera system comprising color temperature correction data storage means for storing previous color temperature correction data And color temperature correction data selection means for selecting color temperature correction data to be combined, and the color temperature correction data storage means includes the combined color temperature correction data combined by the color temperature correction data combining means. It is memorized.
[Selection] Figure 1

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, in conventional electronic cameras with interchangeable lenses, the spectral characteristics differ depending on the lens used.
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, the spectral characteristics differ greatly from the standard lens depending on the actual interchangeable lens used. However, there was a problem that the white balance could not be adjusted accurately.

  On the other hand, the photographer creates color temperature correction information corresponding to the spectral characteristics of the photographic lens unit that can be exchanged for the camera body, and stores the color temperature correction information in the camera body. A video camera and an interchangeable lens capable of exchanging a lens by performing white balance adjustment on the basis of which the lens can be favorably adjusted have been proposed.

JP-A-10-155100

  However, the conventional method has the following disadvantages.

  In other words, color temperature correction information corresponding to the spectral characteristics of the interchangeable photographic lens unit is created and stored in the camera body in advance, so that good white balance adjustment is possible. The value of the color temperature correction data changes depending on the conditions at the time of temperature correction data creation, and deterioration over time such as image burn-in of the lens or image pickup element. In addition, when it is difficult to create color temperature correction data immediately before shooting, shooting using color temperature correction data created under the same conditions as shooting conditions is impossible, and it was created under conditions that differ from shooting conditions. There was no choice but to shoot using the color temperature correction data.

  The present invention eliminates the drawbacks as described above, and provides an electronic camera system capable of exchanging lenses that can perform good white balance adjustment even when it is difficult to create color temperature correction data under the same conditions as the shooting conditions immediately before shooting. For the purpose.

  In order to achieve the above object, the invention described in claim 1 includes an interchangeable photographic lens unit, an image sensor that photoelectrically converts a subject image formed through the photographic lens unit, and a device other than the image sensor. First white balance calculation means for obtaining a first white balance control signal for white balance adjustment using data from a colorimetric sensor, and data from a signal obtained from an image sensor through the photographing lens unit Second white balance calculation means for obtaining a second white balance control signal for white balance adjustment, the first white balance control signal obtained from the first white balance calculation means, and the second white balance The second white balance control signal obtained from the calculating means is compared with the photographing lens unit. Color temperature correction data calculating means for calculating specific color temperature correction data, attaching date and time information when the color temperature correction data was created, and lens information specific to the photographing lens unit; and the first A white balance control means for controlling white balance adjustment by a white balance control signal, the second white balance control signal and the color temperature correction data; and a color temperature correction data storage means for storing a plurality of previous color temperature correction data. An electronic camera system comprising: a color temperature correction data combining means for combining a plurality of color temperature correction data to calculate combined color temperature correction data; and color temperature correction data for selecting the color temperature correction data to be combined Selection means, and the color temperature correction data storage means is synthesized by the color temperature correction data synthesis means. Characterized in that said storing and composite color temperature correction data.

  According to a second aspect of the present invention, in the first aspect of the invention, the color temperature correction data calculating means attaches date and time information when the color temperature correction data is created to the calculated color temperature correction data. The color temperature correction data synthesizing means changes the composition ratio according to the date of creation of the color temperature correction data.

  According to a third aspect of the present invention, in the first aspect of the invention, the color temperature correction data calculating unit attaches lens information specific to the photographing lens unit to the color temperature correction data, and the color temperature correction data selecting unit. Is characterized in that a plurality of the color temperature correction data to be combined are selected according to lens information specific to the photographing lens unit attached to the color temperature correction data.

  According to the first aspect of the present invention, the photographer can create standard color temperature correction data unique to the photographing lens unit.

  According to the second aspect of the present invention, when the photographer creates standard color temperature correction data, the standard color is obtained by increasing the composition ratio of the color temperature correction data having a creation date close to the current date. Temperature correction data can be created.

  According to the third aspect of the present invention, when the photographer selects the color temperature correction data to be combined in order to create standard color temperature correction data, the photographing lens unit specific to the color temperature correction data is selected. With this lens information, it is possible to easily select a plurality of color temperature correction data necessary for synthesis.

  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 an 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 exposure 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 passed through the image processing circuit 20 and the memory control circuit 22, or the data of the A / D converter 16 is passed directly through the memory control circuit 22 to the image display memory 24 or the memory 30. Is written to.

  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.

  Further, 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. Can do.

  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. Accordingly, 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. Write to 30.

  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. By making the light incident on the photometric means 46, 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.

  Furthermore, 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 positions 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.

  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, shooting 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 | ramp etc. among the display contents of the display part 54 includes a self-timer notification lamp etc., 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, 72 and 162 are operation means for inputting various operation instructions of the system control circuit 50, and are switches, dials, touch panels, pointing by line-of-sight detection, and voice recognition devices. Etc., or a combination of a plurality of them.

  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 sport shooting mode, a night view shooting mode, a panorama shooting mode, and the like can be switched and set.

  Reference numeral 62 denotes a shutter switch SW1, which is turned ON during the operation of a shutter button (not shown), and performs operations such as AF (auto focus) 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 out image data from the memory 30, compression in the compression / decompression circuit 32, and writing the image data in the recording medium 200 or 210 The operation start of a series of processes is instructed.

  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.

  A color temperature correction data selection switch 70 selects color temperature correction data for creating composite color temperature correction data from a plurality of color temperature correction data stored in the color temperature correction data storage unit 157.

  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. 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) Alternatively, 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. The gain of the green signal circuit and the gain of the green signal circuit select a preset white light source and a manual white balance set to a fixed gain specific to the color temperature.

  74 is an operation unit composed of various buttons, a touch panel, and the like. Menu button, set button, macro button, multi-screen playback page break button, flash setting button, single shooting / continuous shooting / self-timer switching button, 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 Quick review ON / OFF switch for setting the quick review function for automatic playback, a switch for selecting the compression rate of JPEG compression, or a switch for selecting the CCD RAW mode for digitizing the image sensor signal and recording it on the recording medium. A certain compression mode switch, playback mode, multi-screen playback / erase mode, playback switch that can set each function mode, such as PC connection mode, auto-focus operation starts when the shutter switch SW1 is pressed, once focused Then, there is an AF mode setting switch or the like 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. Also, the power on and power off settings of various accessory devices such as the lens unit 300 connected to the electronic camera main body 100, an external strobe (not shown), and the recording media 200 and 210 can 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, 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.

  82 is a connector, 84 is a connector, 86 is a primary battery such as an alkaline battery or lithium battery, a secondary battery such as a NiCd battery, NiMH battery or 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. It is a recording medium attachment / detachment detecting means for detecting whether or not the recording medium is being used.

  In the present embodiment, it is assumed that there are two interfaces and connectors for attaching a recording medium. Of course, the interface and the connector for attaching the recording medium may have a single or plural number of systems. Further, a configuration including a combination of interfaces and connectors of different standards may be used.

  The interface and connector may be configured using a PCMCIA card, a CF (compact flash) 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, a CF (compact flash) card, or the like, a LAN card, a modem card, a USB card, an IEEE 1394 card, a P1284 card. By connecting various communication cards such as SCSI cards and communication cards such as PHS, image data and management information attached to the image data can be transferred to and from peripheral devices such as other computers and printers. .

  Reference numeral 104 denotes an optical viewfinder, which can guide a light beam incident on the lens 310 through an aperture 312, lens mounts 306 and 106, and mirrors 130 and 132 by an SLR system, and form an image as an optical image. Thereby, it is possible to perform photographing 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, such as an in-focus display, a camera shake warning display, a flash charge display, a shutter speed display, an aperture value display, and an exposure correction display, 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 means 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, 124 is the lens mount 106 and / or Lens attachment / detachment detection means for detecting whether or not the lens unit 300 is attached to the connector 122.

  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 color temperature correction data combining unit that combines the color temperature correction data selected by the color temperature correction data selection switch 70 and the color temperature correction data automatic selection unit 164 (described later) to calculate combined color temperature correction data. .

  Reference numeral 162 denotes a color temperature correction data combining switch, which instructs the calculation of the combined color temperature correction data by the color temperature correction data combining unit 162.

  Reference numeral 164 denotes color temperature correction data automatic selection means, which is stored in the color temperature correction data storage means 157 by the lens information of the lens unit 300 attached to the color temperature correction data selected by the color temperature correction data selection switch 70. The color temperature correction data of the lens unit 300 is automatically selected from the plurality of color temperature correction data.

  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 main 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 external light, and the analog output from the colorimetric sensor 151 is output by the A / D circuit 152. Red signal R1 obtained by conversion to digital signal and obtained from the colorimetric sensor 151
And from the ratio of blue signal B _1, obtaining a R ₁ / G ₁ and B ₁ / G ₁ as the color temperature of ambient light by the external measuring white balance calculation circuit 153.

  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. Red signal R2
And from the ratio of 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 107, 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 changed. Based on the color temperature R ₂ / G ₂ and B ₂ / G _{2 of the} transmitted external light, the color temperature correction data calculation circuit 155 calculates the 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 108, identification information such as a number unique to the lens unit 300, management information, and information on the time when the color temperature correction data is created are acquired from the lens system production circuit 350 of the lens unit 300.

In step 109, the color temperature correction data R ₃ / G ₃ and B ₃ / G ₃ specific 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 a unique number of the lens unit 300, management information, and information on the time when the color temperature correction data was created are stored in the color temperature correction data storage means 157.

  FIG. 4 is a flowchart for creating composite color temperature correction data using color temperature correction data unique to the lens unit 300.

  First, when the color temperature correction data composition switch 162 is turned on in step S201, a plurality of color temperature correction data for composition is selected by operating the color temperature correction data selection switch 70 in step S202.

  In step S203, the color temperature correction data combining unit 160 combines the plurality of color temperature correction data selected in step S202 to create combined color temperature correction data.

  The combined color temperature correction data created in step S203 is stored in the color temperature correction data storage unit 157 in step S204.

  FIG. 5 is a flowchart for creating the combined color temperature correction data using the color temperature correction data unique to the lens unit 300 and the time information when the color temperature correction data is created.

  First, when the color temperature correction data composition switch 162 is turned on in step S301, a plurality of color temperature correction data for composition is selected by operating the color temperature correction data selection switch 70 in step S302.

  In step S303, the color temperature correction data synthesizing unit 160 acquires information on the time at which each color temperature correction data was created from the plurality of color temperature correction data selected in step S302.

  In step S304, a plurality of color temperature correction data selected in step S302 is created by the color temperature correction data combining unit 160 based on the time information when each color temperature correction data obtained in step S303 is created. Composition is performed by changing the composition ratio according to time, and composite color temperature correction data is created.

  The combined color temperature correction data created in step S304 is stored in the color temperature correction data storage unit 157 in step S305.

  FIG. 6 is a flowchart for creating composite color temperature correction data by selecting a plurality of color temperature correction data using identification information such as a number unique to the lens unit 300 and management information.

  First, when the color temperature correction data composition switch 162 is turned on in step S401, one color temperature correction data for composition is selected by operating the color temperature correction data selection switch 70 in step S402.

  In step S403, the color temperature correction data automatic selection unit 164 acquires identification information such as a number unique to the lens unit 300 and management information from the color temperature correction data selected in step S402.

  In step S404, the color temperature correction data automatic selection unit 164 uses the ID of the same ID and management information obtained from the color temperature correction data in step S403 based on identification information such as a lens unit 300-specific number and management information. A plurality of other color temperature correction data specific to the lens unit 300 are automatically selected.

  In step S405, a plurality of color temperature correction data selected in steps S404 and S402 are combined to create color temperature correction data.

  The combined color temperature correction data created in step S405 is stored in the color temperature correction data storage unit 157 in step S406.

It is the schematic of the electronic camera system which shows embodiment of this invention. It is the block diagram which showed the internal structure of the electronic camera system which shows embodiment of this invention. 6 is a flowchart for creating color temperature correction data of a mounted lens unit in the embodiment of the present invention. 6 is a flowchart for creating combined color temperature correction data using color temperature correction data unique to a lens unit in the embodiment of the present invention. 6 is a flowchart for creating combined color temperature correction data using color temperature correction data unique to a lens unit and time information when the color temperature correction data is created in the embodiment of the present invention. 5 is a flowchart for creating composite color temperature correction data by selecting a plurality of color temperature correction data using identification information such as a number unique to the lens unit and management information in the embodiment of the present invention. .

Explanation of symbols

100 Electronic Camera Body 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 selection switch 72 White balance selection switch 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 composition means 162 Color temperature correction data composition switch 164 Color temperature correction data automatic selection means 200 Recording medium 210 Recording medium 300 Lens unit 350 Lens system control circuit

Claims (3)

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, color temperature correction data specific to the photographing lens unit is calculated, and the color temperature correction data is calculated. Color temperature correction data calculation means for attaching date and time information when the data was created and lens information specific to the photographing lens unit, the first white balance control signal, and the second white balance control signal In an electronic camera system, comprising: white balance control means for controlling white balance adjustment by the color temperature correction data; and color temperature correction data storage means for storing a plurality of previous color temperature correction data.
Color temperature correction data combining means for combining a plurality of color temperature correction data and calculating combined color temperature correction data; and color temperature correction data selection means for selecting color temperature correction data to be combined, and storing the color temperature correction data The means stores the synthesized color temperature correction data synthesized by the color temperature correction data synthesizing means.   The color temperature correction data calculation means attaches information on the date and time when the color temperature correction data was created to the calculated color temperature correction data, and the color temperature correction data composition means creates color temperature correction data. 2. The electronic camera system according to claim 1, wherein the composition ratio is changed depending on the day.   The color temperature correction data calculation means attaches lens information specific to the photographing lens unit to the color temperature correction data, and the color temperature correction data selection means attaches the photographing lens unit attached to the color temperature correction data. 2. The electronic camera system according to claim 1, wherein a plurality of the color temperature correction data to be combined are selected based on unique lens information.

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