JP2006148794A - Imaging apparatus, correction processing method, correction processing program and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus, correction processing method, and correction processing computer program in which a look of a defective pixel of a specific color in an image after color reproduction processing is improved and image quality reduction with too much or too little defective pixel correction can be avoided. <P>SOLUTION: A system control circuit 50 of an image processing apparatus 100 performs defective pixel correction processing, for an output of a photographing element 14, on level and address information of a defective pixel of an imaging element 14 stored in a nonvolatile memory 56 using predetermined thresholds different for each of R, G and B in accordance with white balance mode setting for correcting photographing conditions or a color temperature of a light source in photographing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging apparatus, an imaging method, a program, and a storage medium that capture, record, and reproduce a still image and a moving image, for example.

  Conventionally, as this type of imaging device, there has already been an imaging device such as an electronic camera that records and reproduces still images and moving images captured by a solid-state imaging device such as a CCD or CMOS, using a memory card having a solid-state memory element as a recording medium. It is commercially available.

  When imaging using a solid-state imaging device such as a CCD or CMOS, the pixel deficiency is corrected and the captured image data is corrected for image quality degradation caused by dark current noise generated by the imaging device or microscopic scratches inherent to the imaging device. And high-quality images can be obtained.

  In particular, dark current noise increases with the charge accumulation time and the temperature rise of the image sensor. Therefore, when performing long-time exposure or exposure at high temperatures, a large image quality improvement effect can be obtained. Therefore, pixel defect correction is a useful function.

  This pixel defect correction is usually performed as follows. First, a defective pixel of an image sensor is detected in advance, and various data relating to the defective pixel are stored in a ROM (Read Only Memory) or the like.

  With the position of the defective pixel stored in the ROM in advance as described above, the image data stored in the ROM among the image data supplied from the image sensor via the A / D converter or the like is used when the imaging apparatus is used. The defective pixel data is corrected using pixel data in the vicinity of the pixel at the position corresponding to the position data of the defective pixel (that is, the defective pixel).

  As a result, out of the video signal obtained by the image sensor, the output (defective pixel data) by the pixel (that is, defective pixel) that outputs a signal of a specific level is corrected, and a good reproduced image can be obtained. .

  In the conventional imaging device such as an electronic camera, if the output level for performing defective pixel correction is set low, a huge number of pixels are corrected as defective pixels, which leads to image quality deterioration. Therefore, a predetermined threshold value is set. There is a method for correcting defective pixels.

There are a method of setting a predetermined threshold value for the output level and a method of correcting defective pixels for a predetermined number from a large output level (for example, Document 1).
Japanese Patent Laid-Open No. 06-350926

  However, in order to perform white balance processing during color reproduction processing, different gains are applied to each pixel of Red (R), Green (G), and Blue (B). The output level at which defective pixel correction is performed differs from one to the other, and defective pixels with high gain are conspicuous, or defective pixel correction is performed more than necessary.

  Accordingly, the present invention provides an imaging apparatus, a correction processing method, and a correction that can improve that a defective pixel of a specific color is conspicuous in an image after color reproduction processing without performing unnecessary defective pixel correction. It is an object to provide a processing program and a storage medium.

  In order to achieve the above object, an imaging apparatus of the present invention comprises the following configurations (1) and (2).

  (1) An image pickup device having a plurality of pixels having different spectral characteristics, a correction data storage means having information related to an address and a level for correcting an output of a defective pixel of the image pickup device, and a plurality of the different spectral characteristics A level set for each of the different spectral characteristics set by the correction level setting means from the correction level setting means for setting a different level for each pixel output and the correction data stored in the correction data storage means An imaging apparatus comprising: correction data reading means for reading correction data in accordance with the correction data; and defective pixel correction means for correcting defective pixels with respect to the output of the imaging device using the read correction data.

  (2) An image pickup device having a plurality of pixels having different spectral characteristics, a correction data storage means having information related to an address and a level for correcting an output of a defective pixel of the image pickup device, and a plurality of the different spectral characteristics Correction number setting means for setting a different number of corrections for each pixel output, and setting for each of the different spectral characteristics set by the correction number setting means from correction data stored in the correction data storage means An imaging device comprising: correction data reading means for reading correction data in accordance with the number of corrections; and defective pixel correction means for correcting defective pixels with respect to the output of the imaging device using the read correction data. apparatus.

  That is, an image pickup apparatus for recording a photographed image on a recording medium, a means for storing the position and level of a defective pixel, and a defective pixel correction for correcting a defective pixel according to the position and level stored in the storage means In the image pickup apparatus having the means, it differs for each of R, G, and B depending on the level of a predetermined threshold value that is different for each of R, G, and B or the gain of R, G, and B of white balance. And defective pixel correction means for performing defect correction only for defective pixels having a level equal to or higher than a threshold value.

  As described above, the present invention has the following effects.

  (1) By setting the respective defect correction levels for R, G, and B, it is possible to prevent deterioration in image quality due to conspicuous defective pixels of a specific color in the final image after color reproduction processing, and with a minimum number of defect corrections. Since the correction can be made, the memory capacity is reduced and the processing speed is increased.

  (2) The scratch correction levels for R, G, and B are set in conjunction with the scratch correction levels for R, G, and B according to the white balance correction mode that corrects the color temperature of the light source during shooting. Therefore, there is an effect that it is possible to perform defect correction adapted to various shooting conditions with different light sources.

  Embodiments of an imaging apparatus, an imaging method, a program, and a storage medium of the present invention will be described with reference to the drawings. The imaging apparatus of this embodiment is applied to an electronic camera.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration of an electronic camera according to an embodiment. In the figure, reference numeral 100 denotes an image processing apparatus. Reference numeral 12 denotes a shutter having a diaphragm function for controlling the exposure amount of the image sensor 14. An image sensor 14 converts an optical image into an electric signal.

  The light beam incident on the photographing lens 310 in the lens unit 300 forms an optical image on the image sensor 14 guided by the single-lens reflex system through the diaphragm 312, the lens mounts 306 and 106, the mirror 130, and the shutter 12.

  Reference numeral 16 denotes an A / D converter that converts an analog signal output from 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. The image processing circuit 20 performs predetermined calculation processing using image data taken as necessary, and the system control circuit 50 controls the exposure (shutter) control unit 40 and the distance measurement control unit 42 based on the obtained calculation result. TTL (through-the-lens) AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash dimming) processing for control are performed. The image processing circuit 20 performs predetermined arithmetic processing using the captured image data, and performs TTL AWB (auto white balance) processing based on the obtained arithmetic result.

  In the present embodiment, since the distance measurement control unit 42 and the photometry control unit 46 are provided exclusively, the system control circuit 50 uses the distance measurement control unit 42 and the photometry control unit 46 to perform AF (autofocus) processing. , AE (automatic exposure) processing and EF (flash dimming) processing are performed, and the image processing circuit 20 is used for AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash dimming) processing. It is good also as a structure which does not perform each process.

  Further, the AF (auto focus) process, the AE (automatic exposure) process, and the EF (flash dimming) process are performed using the distance measurement control unit 42 and the photometry control unit 46, and the image processing circuit 20 is used. The AF (autofocus) process, the AE (automatic exposure) process, and the EF (flash dimming) process may be performed.

  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.

  Data from 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 directly via the memory control circuit 22.

  Reference numeral 24 is an image display memory, and 26 is a D / A converter. Reference numeral 28 denotes an image display unit comprising a TFT type LCD. The display image data written in the image display memory 24 is displayed on the image display unit 28 via the D / A converter 26. When the captured image data is sequentially displayed on the image display unit 28, an electronic viewfinder function can be realized. Further, the image display unit 28 can arbitrarily turn on / off the display in accordance with an instruction from the system control circuit 50. When the display is turned off, the power consumption of the image processing apparatus 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. Therefore, even in 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 a shutter control unit that controls the shutter 12 in cooperation with an aperture control unit 340 that controls the aperture 312 based on photometry information from the photometry control unit 46. 42
Is a distance measurement control unit for performing AF (autofocus) processing. Light beams incident on the photographing lens 310 in the lens unit 300 are used to stop the aperture 312, lens mounts 306 and 106, the mirror 130, and a distance measurement sub-mirror (not shown). 1), the in-focus state of the image formed as an optical image is measured.

  A thermometer 44 detects the ambient temperature in the photographing environment. When the thermometer 44 is in the image sensor (sensor) 14, it is possible to predict the dark current of the sensor more accurately.

  Reference numeral 46 denotes a photometric control unit for performing AE (automatic exposure) processing. The light beam incident on the photographing lens 310 in the lens unit 300 is converted into an aperture 312, lens mounts 306 and 106, a mirror 130, and a photometric sub-mirror (not shown). The exposure state of the image formed as an optical image is measured. The photometry control unit 46 also has an EF (flash dimming) processing function in cooperation with the flash unit 48. A flash unit 48 has an AF auxiliary light projecting function and a flash light control function.

  As described above, based on the calculation result calculated by the image processing circuit 20 using the image data picked up by the image pickup device 14, the system control circuit 50 includes the exposure (shutter) control unit 40, the aperture control unit 340, It is possible to perform exposure control and AF (autofocus) control using the video TTL system for the distance measurement control unit 342.

  Further, AF (autofocus) control may be performed using a measurement result obtained by the distance measurement control unit 42 and a calculation result obtained by calculating the image data captured by the image sensor 14 by the image processing circuit 20. Further, exposure control may be performed using the measurement result obtained by the photometry control 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 image processing apparatus 100 and incorporates a known CPU and the like. Reference numeral 52 denotes a memory for storing constants, variables, programs, and the like for operating the system control circuit 50. Reference numeral 54 denotes a display unit having a liquid crystal display device, a speaker, and the like for displaying an operation state and a message with characters, images, voices, and the like in accordance with execution of a program in the system control circuit 50. An operation unit of the image processing device 100 It is installed at one or a plurality of places that are easily visible in the vicinity. The display unit 54 is configured by a combination of an LCD, an LED, a sound generating element, and the like. Some functions of the display unit 54 are provided in the optical viewfinder 104.

  Among the display contents of the display unit 54, what is displayed on the LCD or the like includes single shot / continuous shooting display, self-timer display, compression rate display, number of recorded pixels, number of recorded pixels, number of remaining images that can be captured, 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 and recording There are an attachment / detachment state display of the media 200 and 210, an attachment / detachment state display of the lens unit 300, a communication I / F operation display, a date / time display, and a display showing a connection state with an external computer.

  Among the display contents of the display unit 54, what is displayed in the optical finder 104 includes in-focus display, shooting preparation completion display, camera shake warning display, flash charge display, flash charge completion display, shutter speed display, aperture value. Display, exposure compensation display, recording medium writing operation display, and the like.

  Furthermore, 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, flash charge display, flash charge completion display, recording medium writing operation display, Macro shooting setting notification display, secondary battery charge display, etc.

  Among the display contents of the display unit 54, what is displayed on a lamp or the like includes, for example, a self-timer notification lamp. This self-timer notification lamp may be shared with AF auxiliary light.

  Reference numeral 56 denotes an electrically erasable / recordable nonvolatile memory in which programs and the like to be described later are stored, and an EEPROM or the like is used as the nonvolatile memory 56. The nonvolatile memory 56 stores various parameters, setting values such as ISO sensitivity, setting modes, and data on the position and level of defective pixels.

  The position and level data of the defective pixel is created and written at the time of adjustment or inspection in the production process. As a method for creating the data of the position and level of the defective pixel, for example, a method of generating data by extracting a pixel having an output of a predetermined level or higher of an image obtained by performing dark photographing can be considered.

  Reference numerals 60, 62, 64, 66, 68 and 70 are operation units for inputting various operation instructions of the system control circuit 50, and include one or a plurality of switches, dials, touch panels, pointing by line-of-sight detection, voice recognition devices, and the like. Composed of a combination. Details of these operation units are shown below.

  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 shooting mode, a sports shooting mode, a night view shooting mode, and a panoramic shooting mode can be switched and set.

  A shutter switch (SW1) 62 is turned on during the operation of a shutter button (not shown), and AF (auto focus) processing, AE (automatic exposure) processing, AWB (auto white balance) processing, EF (flash adjustment). Instructs the start of operation such as light processing.

  Reference numeral 64 denotes a shutter switch (SW2), which is turned on when the operation of a shutter button (not shown) is completed. The shutter switch (SW2) 64 is an exposure process for writing image data into the memory 30 via the A / D converter 16 and the memory control circuit 22 through the signal read from the image sensor 14, the image processing circuit 20 and the memory control circuit 22. The development processing using the calculation in the above, the image data is read from the memory 30, compressed by the compression / decompression circuit 32, and the start of a series of processing operations such as recording processing for writing the image data to the recording media 200 and 210 is instructed.

  Reference numeral 66 denotes a playback switch, which instructs to start a playback operation for reading an image shot in the shooting mode state from the memory 30 or the recording medium 200 or 210 and displaying it on the image display unit 28.

  Reference numeral 68 denotes a single / continuous shooting switch. When the shutter switch SW2 64 is pressed, a single shooting mode in which one frame is shot to enter a standby state, and shooting is continuously performed while the shutter switch SW2 64 is pressed. It is possible to set the continuous shooting mode to continue.

  Reference numeral 69 denotes an ISO sensitivity setting switch, which can set the ISO sensitivity by changing the gain setting in the image sensor 14 or the image processing circuit 20.

  Reference numeral 70 denotes an operation unit composed of 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, menu movement + (plus ) Button, menu shift-(minus) button, playback image shift + (plus) button, playback image-(minus) button, shooting image quality selection button, exposure compensation button, date / time setting button, panorama mode shooting and playback A selection / switch button for setting selection and switching of various functions at the time of execution, a determination / execution button for setting determination and execution of various functions at the time of shooting and playback in panoramic mode, etc. Image display ON / OFF switch to set ON / OFF, image taken immediately after shooting Quick review ON / OFF switch for setting the quick review function for automatically reproducing data, for selecting the compression rate of JPEG compression, or for selecting the CCD RAW mode for digitizing the image sensor signal and recording it on a recording medium Auto-focus operation starts when pressing the shutter switch SW1, a playback switch that can set each function mode, such as a compression mode switch, playback mode, multi-screen playback / erase mode, and PC connection mode. In this case, 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 the autofocus operation continuously while pressing the shutter switch SW1.

  Further, the functions of the plus button and the minus button can be selected more easily with numerical values and functions by providing a rotary dial switch.

  Reference numeral 72 denotes a power switch, which can be set to switch between power-on and power-off modes of the image processing apparatus 100. In addition, the power on and power off settings of various accessory devices such as the lens unit 300, the external strobe, and the recording media 200 and 210 connected to the image processing apparatus 100 can be switched.

  Reference numeral 80 denotes a power control unit, which includes a battery detection circuit, a DC-DC converter, a switch circuit that switches a block to be energized, and the like, detects whether or not a battery is installed, the type of battery, and the remaining battery level. The DC-DC converter is controlled based on the detection result and the instruction of the system control circuit 50, and a necessary voltage is supplied to each part including the recording medium for a necessary period.

  Reference numerals 82 and 84 denote connectors, 86 denotes 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.

  Reference numerals 90 and 94 denote interfaces with recording media 200 and 210 such as memory cards and hard disks, reference numerals 92 and 96 denote connectors for connecting to recording media such as memory cards and hard disks, and reference numeral 98 denotes connectors 92 and 96 that are connected to the recording media 200 and 210. Is a recording medium attachment / detachment detection unit that detects whether or not the is attached.

  In this embodiment, two interfaces and connectors for attaching the recording medium are provided. However, a single or an arbitrary number of interfaces and connectors for attaching the recording medium may be provided. Further, as interfaces and connectors of different standards, those conforming to standards such as PCMCIA cards and CF (Compact Flash (registered trademark)) cards may be used.

  Further, when the interfaces 90 and 94 and the connectors 92 and 96 are configured using a standard conforming to a PCMCIA card or a CF (Compact Flash (registered trademark)) card, a LAN card, a modem card, a USB card, and an IEEE 1394 card are used. By connecting various communication cards such as communication cards such as P1284 card, SCSI card, PHS, etc., image data and management information attached to the image data are mutually transferred between peripheral devices such as other computers and printers. Is possible.

  Reference numeral 104 denotes an optical viewfinder, which guides a light beam incident on the photographing lens 310 through an aperture 312, lens mounts 306 and 106, and mirrors 130 and 132 by a single-lens reflex system, and forms an optical image for display. Is possible. Accordingly, it is possible to perform shooting using only the optical viewfinder 104 without using the electronic viewfinder function of the image display unit 28. Further, 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 provided.

  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 image processing apparatus 100 to another device by the communication unit 110 or an antenna for performing wireless communication.

  Reference numeral 120 denotes an interface for connecting the image processing apparatus 100 to the lens unit 300 in the lens mount 106. A connector 122 electrically connects the image processing apparatus 100 to the lens unit 300. Although not shown, a lens attachment / detachment detection unit for detecting whether or not the lens unit 300 is attached to the lens mount 106 and / or the connector 122 is provided.

  The connector 122 transmits control signals, status signals, data signals, and the like between the image processing apparatus 100 and the lens unit 300, and also has a function of supplying currents of various voltages. Further, the connector 122 may be configured to transmit not only electrical communication but also optical communication, voice communication, and the like.

  Reference numerals 130 and 132 denote mirrors that guide light rays incident on the photographing lens 310 to the optical viewfinder 104 by a single-lens reflex system. The mirror 132 may be either a quick return mirror or a half mirror.

  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, and the like, an interface 204 with the image processing apparatus 100, and a connector 206 for connecting with the image processing apparatus 100. Reference numeral 210 denotes a recording medium such as a memory card or a hard disk, similar to the recording medium 200. 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 image processing apparatus 100, and a connector 216 for connecting with the image processing apparatus 100.

  Reference numeral 300 denotes an interchangeable lens type lens unit. A lens mount 306 mechanically couples the lens unit 300 to the image processing apparatus 100. The lens mount 306 includes various functions for electrically connecting the lens unit 300 to the image processing apparatus 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 image processing apparatus 100 in the lens mount 306. A connector 322 electrically connects the lens unit 300 to the image processing apparatus 100.

  The connector 322 has a function of transmitting a control signal, a status signal, a data signal, and the like between the image processing apparatus 100 and the lens unit 300 and supplying various currents or supplying currents. The connector 322 may be configured to transmit not only an electrical signal but also an optical signal, an audio signal, 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 control unit 46. A distance measurement control unit 342 controls focusing of the photographing lens 310. A zoom control unit 344 controls 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 identification information such as a memory and an identification number unique to the lens unit 300, management information, function information such as an open aperture value, a minimum aperture value, and a focal length. It also has a non-volatile memory function for holding current and past set values.

  The operation of the electronic camera having the above configuration will be described. 2, 3, and 4 are flowcharts showing the photographing operation processing procedure of the image processing apparatus 100. This processing program is stored in a storage medium such as the nonvolatile memory 56, loaded into the memory 52, and executed by the CPU in the system control circuit 50.

  Upon power-on such as battery replacement, the system control circuit 50 initializes flags, control variables, and the like, and performs necessary initial settings for each part of the image processing apparatus 100 (step S101). The system control circuit 50 determines the set position of the power switch 72, and determines whether or not the power switch 72 is set to power OFF (step S102).

  When the power switch 72 is set to power OFF, the display of each display unit is changed to the end state, and necessary parameters, setting values, and setting modes including flags and control variables are recorded in the nonvolatile memory 56. After the power control unit 80 performs a predetermined end process such as cutting off unnecessary power of each part of the image processing apparatus 100 including the image display unit 28 (step S103), the process returns to the process of step S102.

  On the other hand, when the power switch 72 is set to ON, the system control circuit 50 determines whether the remaining capacity of the power source 86 such as a battery and the operation status have a problem in the operation of the image processing apparatus 100 by the power control unit 80. Is determined (step S104). If it is determined that there is a problem, a predetermined warning is given by displaying an image or outputting sound on the display unit 54 (step S105), and then the process returns to step S102.

  On the other hand, if it is determined that there is no problem with the power supply 86, the system control circuit 50 determines the setting position of the mode dial switch 60 and determines whether or not the mode dial switch 60 is set to the shooting mode (step S106). ). When the mode dial switch 60 is set to another mode, the system control circuit 50 executes processing according to the selected mode (step S107), and returns to the processing of step S102 after execution.

  On the other hand, when the mode dial switch 60 is set to the shooting mode, it is determined whether or not the recording media 200 and 210 are attached, acquisition of management information of the image data recorded on the recording media 200 and 210, and recording. It is determined whether or not the operation state of the media 200 and 210 has a problem in the operation of the image processing apparatus 100, in particular, the recording / reproducing operation of the image data on the recording medium (step S108). If it is determined that there is a problem, a predetermined warning is given by displaying an image or outputting sound on the display unit 54 (step S105), and then the process returns to step S102.

  On the other hand, if it is determined in step S108 that there is no problem, the system control circuit 50 displays various setting states of the image processing apparatus 100 using images and sounds using the display unit 54 (step S109). Here, when the image display switch of the image display unit 28 is ON, various setting states of the image processing apparatus 100 may be displayed by an image or sound using the image display unit 28.

  It is determined whether or not the shutter switch SW1 62 has been pressed (step S113). If the shutter switch SW1 62 has not been pressed, the process returns to step S102. On the other hand, when the shutter switch SW1 62 is pressed, the system control circuit 50 performs a distance measurement process to focus the photographing lens 310 on the subject, and performs a light measurement process to determine an aperture value and a shutter speed. A photometric process is performed (step S114). In the photometric process, the flash is set if necessary.

  Then, it is determined whether or not the shutter switch SW2 64 is pressed (step S115). If the shutter switch SW2 64 is not pressed, it is determined whether or not the shutter switch SW1 62 is released (step S116). Steps S115 and S116 are repeated until the shutter switch SW1 62 is released or the shutter switch SW2 64 is pressed. If the shutter switch SW1 62 is released in step S116, the process proceeds to step S102.

  On the other hand, when the shutter switch SW264 is pressed in step S115, the system control circuit 50 determines whether or not the memory 30 has an image storage buffer area in which captured image data can be stored (step S126). If it is determined that there is no area where new image data can be stored in the image storage buffer area of the memory 30, a predetermined warning is given to the display unit 54 by displaying an image or outputting sound (step S127). The process returns to step S102.

  For example, immediately after performing the maximum number of continuous shots that can be stored in the image storage buffer area of the memory 30, the first image to be read from the memory 30 and written to the storage media 200, 210 is still the storage media 200, 210. This is a case where a single blank area cannot be secured in the image storage buffer area of the memory 30.

  Note that when the captured image data is compressed and stored in the image storage buffer area of the memory 30, the area that can be stored in consideration of the fact that the amount of compressed image data varies depending on the compression mode setting. Is in the image storage buffer area of the memory 30, it is determined in the process of step S126.

  On the other hand, if it is determined in step S126 that there is an image storage buffer area capable of storing the image data captured in the memory 30, the system control circuit 50 reads out the imaging signal that has been captured and accumulated for a predetermined time from the imaging element 14, and The photographed image data is written in a predetermined area of the memory 30 via the A / D converter 16, the image processing circuit 20 and the memory control circuit 22, or directly from the A / D converter 16 via the memory control circuit 22. An imaging process is executed (step S128). Details of this photographing process will be described later.

  When the photographing process in step S128 is completed, the system control circuit 50 performs defective pixel correction using the data of the scratch correction table stored in the internal memory or the memory 52 (step S129). Details of the defective pixel correction processing will be described later.

  Next, the process proceeds to the development process (step S130). The system control circuit 50 reads a part of image data written in a predetermined area of the memory 30 via the memory control circuit 22 and performs WB (white balance) integration calculation processing, OB (optical) necessary for development processing. Black) Integral calculation processing is performed, and the calculation result is stored in the internal memory or the memory 52 of the system control circuit 50.

  Then, the system control circuit 50 uses the memory control circuit 22 and, if necessary, the image processing circuit 20 to read the captured image data written in a predetermined area of the memory 30 and reads the internal memory or the memory 52 of the system control circuit 50. Are used to perform various development processes including an AWB (auto white balance) process, a gamma conversion process, and a color conversion process (step S130).

  The system control circuit 50 reads out the image data written in a predetermined area of the memory 30, performs image compression processing according to the set mode by the compression / decompression circuit 32, and free images in the image storage buffer area of the memory 30. The image data that has been shot and finished a series of processing is written in the portion (step S131).

  Then, the system control circuit 50 reads the image data stored in the image storage buffer area of the memory 30 and records it on a memory card, a compact flash (registered trademark) card or the like via the interfaces 90 and 94 and the connectors 92 and 96. Recording processing for writing the read image data on the media 200 and 210 is started (step S132). This recording start process is performed on the image data every time new image data is shot and written in the empty image portion of the image storage buffer area of the memory 30.

  Note that while writing image data to the recording media 200 and 210, in order to indicate that the writing operation is being performed, a recording medium writing operation display such as blinking an LED is performed on the display unit 54, for example.

  Furthermore, the system control circuit 50 determines whether or not the shutter switch SW1 62 has been pressed (step S133). If the shutter switch SW1 62 is released, the process returns to step S102. On the other hand, if the shutter switch SW1 62 has been pressed and if single shooting has been set, the process returns to step S115, and the current process is repeated until the shutter switch SW1 62 is released. As a result, a series of processing relating to photographing is completed.

  FIG. 5 is a flowchart showing the distance measurement / photometry processing procedure in step S114. In the distance measurement / photometry processing, the exchange of various signals between the system control circuit 50 and the aperture control unit 340 or the distance measurement control unit 342 includes an interface 120, a connector 122, a connector 322, an interface 320, and a lens system control circuit 350. Is done through.

  The system control circuit 50 starts an AF (autofocus) process using the image sensor 14, the distance measurement control unit 42, and the distance measurement control unit 342 (step S201).

The system control circuit 50 converts the light incident on the taking lens 310 into a stop 312,
By making it enter the distance measurement control unit 42 through the lens mounts 306 and 106, the mirror 130, and the distance measurement sub-mirror (not shown), the in-focus state of the image formed as an optical image is determined, and the measurement is performed. Until the distance (AF) is determined to be in focus, the distance measurement control unit 342 is used to drive the photographing lens 310 while the distance measurement control unit 42 is used to detect the in-focus state (step AF). S202, S203).

  When ranging (AF) is determined to be in focus in step S203, the system control circuit 50 determines a focused distance point from a plurality of distance measurement points on the shooting screen, and the determined distance measurement point. Ranging data and / or setting parameters are stored in the internal memory of the system control circuit 50 or the memory 52 together with the data (step S204).

  Subsequently, the system control circuit 50 starts an AE (automatic exposure) process using the photometry control unit 46 (step S205). The system control circuit 50 causes the light beam incident on the photographing lens 310 to enter the photometry control unit 46 via the aperture 312, the lens mounts 306 and 106, the mirrors 130 and 132, and the photometry lens (not shown). Then, the exposure state of the image formed as an optical image is measured, and photometric processing is performed using the exposure (shutter) control unit 40 until it is determined that the exposure (AE) is appropriate (steps S206 and S207).

  The system control circuit 50 determines the aperture value (Av value) and the shutter speed (Tv value) according to the exposure (AE) result detected by the photometric processing in step S206 and the photographing mode set by the mode dial switch 60. Is done.

  Here, the system control circuit 50 determines the charge accumulation time of the image sensor 14 according to the determined shutter speed (Tv value).

  If it is determined in step S207 that the exposure (AE) is appropriate, the system control circuit 50 determines whether or not flashing is necessary based on the measurement data obtained by the photometric process in step S206 (step S208). If the flash is necessary, the flash flag is set and the flash unit 48 is charged until the charging is completed (steps S209 and S210). Then, when the charging of the flash unit 48 is completed, this process is terminated and the process returns to the main process.

  FIG. 6 is a flowchart showing the photographing processing procedure in step S128. In this photographing process, various signals are exchanged between the system control circuit 50 and the aperture control unit 340 or the distance measurement control unit 342 via the interface 120, the connector 122, the connector 322, the interface 320, and the lens system control circuit 350. Done.

  The system control circuit 50 moves the mirror 130 to the mirror up position by a mirror driving unit (not shown) (step S301), and according to the photometric data stored in the internal memory of the system control circuit 50 or the memory 52, the aperture control unit The diaphragm 312 is driven to a predetermined diaphragm value by 340 (step S302).

  After performing the charge clear operation of the image sensor 14 (step S303), the system control circuit 50 starts charge accumulation of the image sensor 14 (step S304), and opens the shutter 12 by the shutter control unit 40 (step S305). Exposure of the image sensor 14 is started (step S306).

  Then, it is determined whether or not the flash unit 48 is necessary based on the flash flag (step S307), and if necessary, the flash unit 48 is caused to emit light (step S308).

  The system control circuit 50 waits for the exposure of the image sensor 14 according to the photometric data (step S309), and when the exposure ends, the shutter control unit 40 closes the shutter 12 (step S310) and ends the exposure of the image sensor 14. .

  The system control circuit 50 drives the aperture 312 to the open aperture value by the aperture controller 340 (step S311), and moves the mirror 130 to the mirror down position by the mirror driver (not shown) (step S312).

  It is determined whether or not the set charge accumulation time has elapsed (step S313). If the set charge accumulation time has elapsed, the system control circuit 50 finishes the charge accumulation of the image sensor 14 (step S314), and then performs imaging. A charge signal is read out from the element 14, and a predetermined area of the memory 30 through the A / D converter 16, the image processing circuit 20, the memory control circuit 22, or directly from the A / D converter 16 through the memory control circuit 22. The photographed image data is written in (Step S315). When the series of processes is completed, the present process is terminated and the process returns to the main process.

  FIG. 7 is a detailed flowchart of the scratch correction process in step S129 of FIG. First, the system control circuit 50 of the image processing apparatus 100 reads out defect correction data to be used when performing defect correction processing (step S401). In this case, the defect correction data is stored in the nonvolatile memory 56 or the built-in memory of the system control circuit 50, and the defect correction data that is actually used in the defect correction processing after photographing is read out.

  Here, the defect correction data is obtained from the information obtained by sorting the defective pixels detected in advance in the order of the output level, from the gain for each color of R, G, and B that is selectively changed by the setting of the white balance mode, or from the captured image. This data holds information related to the address of the defective pixel selected according to the output level corresponding to the gain for each color that is calculated and changed.

  The defect correction data reading sequence will be described in detail with reference to FIGS. 8 and 9 are detailed flowcharts and tables for reading correction data for flaw correction in step S401 in FIG. When the image sensor 14 is shipped, various scratch pixels (defective pixels) are extracted from image data obtained at a predetermined environmental temperature and a predetermined charge accumulation time. These scratched pixels are separated for each of R, G, and B and sorted for each output level. Based on the shipping data in which the address and scratch level are described, the data stored in the memory in the image processing apparatus 100 Is molded. This process is performed externally by the image processing apparatus 100.

  8 will be described in the order of steps corresponding to the above description. First, the system control circuit 50 and ISO sensitivity setting values (for example, 100, 200, 400, 800) are confirmed (step S501). ), The shutter speed is confirmed (step S502), the white balance mode setting is confirmed (step S503), and ISO setting value> 400 is determined (step S504). If the ISO setting value is 400 or less, LEVEL 1 is put into (step 505). If the ISO setting exceeds 400, LEVEL is set to 2 (step S507). Next, it is determined whether the shutter speed is 1 second or less (step 506). If the shutter speed exceeds 1 second, 1 is added to LEVEL (step S508). If the shutter speed is 1 second or less, a scratch correction level is set (step S509).

  Here, the ISO setting performed in step S509 and the setting of the scratch correction level according to the shutter speed will be described.

  Many white scratches tend to increase in level according to the exposure time (charge accumulation time) of the image sensor 14, and even if the white scratches are at the same level, the set ISO sensitivity (gain of the image sensor 14 and image) Depending on the gain of the processing circuit 20, the level of scratches in the case of an image changes.

  For example, the higher the ISO is, the higher the scratch level in the image is, and it is necessary to lower the value of the scratch correction level in the shipping data for extracting the pixel address that needs to be corrected. Further, the system control circuit 50 determines the charge accumulation time of the image sensor 14 according to the shutter speed (Tv value) determined in the photometric process (S206 in FIG. 5). As the charge accumulation time becomes longer, the white scratch level rises, and the output of a pixel that does not cause a problem in a short time may become a large scratch level in a long time. Therefore, it is necessary to decrease the value of the scratch correction level in the shipping data as the shutter speed increases.

  For example, referring to FIGS. 9 (a) and 9 (b), the defect correction level corresponding to the ISO sensitivity and the shutter speed Tv is set in three levels LEVEL1, LEVEL2, and LEVEL3, and the defect correction level in the shipping data is 10 mV or more, respectively. 5 mV or more and 2 mV or more.

  When ISO is 400 or less and the shutter speed is 1 second or less, the scratch correction level is set to 10 mV. If the ISO exceeds 400 and the shutter speed exceeds 1 second, the scratch correction level is set to 2 mV.

  Next, white balance gain correction is performed (step S510).

  Here, the white balance gain correction will be described. When the white balance correction for correcting the difference in color temperature of the light source at the time of shooting is performed, a different gain is applied to each color of R, G, and B. As a result, the level of scratches will change for each color.

  As shown in FIG. 9C, using the white balance mode set at the time of shooting, for example, the R gain, G gain, and B gain set for each of the sunlight mode, fluorescent lamp mode, and bulb mode, (c) The scratch correction level (R, G, B) is set for each of R, G, B according to the arithmetic expression shown in FIG.

  Next, the scratch data set for each of R, G, and B is read (step S510). In step S510, R, G, B data (DataR, DataG, DataB) stored in the nonvolatile memory 56 or the built-in memory of the system control circuit 50 are set to R, G, B respectively. Reads address information related to scratches above the scratch correction level and returns.

  Returning to FIG. 7, the system control circuit 50 specifies the flaw correction data to be used in step S <b> 402, and then describes the flaw correction data specified in step S <b> 402 in order to compensate for white flaws in the image sensor 14. While referring to the information indicating the address of the white defect pixel, the point defect correction process is performed on the corresponding pixel of the photographed image written in the predetermined area of the memory 30 using the photographed image data of the adjacent same color pixel. First, the system control circuit 50 reads flaw address information for one pixel from the head of the selected flaw correction data (S403). By referring to this address information, it is possible to specify the address of the corresponding pixel in the captured image written in the memory 30.

  Next, the system control circuit 50 reads captured image data of the same color pixel adjacent to the corresponding pixel whose address is specified in step S403 (step S404). Next, the system control circuit 50 calculates the correction amount of the corresponding pixel from the value of the adjacent pixel obtained in step S404 (step S405). Subsequently, the system control circuit 50 writes the correction amount of the corresponding pixel calculated in step S405 to the corresponding address in the memory 30 (step S406). Thereby, the correction process of the corresponding pixel is completed.

  Next, the system control circuit 50 determines whether or not all the defect correction processes for the defect pixels described in the designated drawing correction data have been completed (step S407).

  If it is determined that the defect pixel correction process has not been completed, the process returns to step S403, the next defect address information described in the defect correction data is read, and the same process as described above is repeated. On the other hand, if the system control circuit 50 determines that all the scratch correction processes described in the specified scratch correction data have been completed, the system control circuit 50 determines whether there is data to be corrected next (step S408).

  When all the defect correction processes for all the defect pixels read out in S401 are completed, the entire defect correction processing sequence is completed.

  As described above, the present embodiment has the following effects.

  (1) By setting the respective defect correction levels for R, G, and B, it is possible to prevent deterioration in image quality due to conspicuous defective pixels of a specific color in the final image after color reproduction processing, and with a minimum number of defect corrections. Since the correction can be made, the memory capacity is reduced and the processing speed is increased.

  (2) The scratch correction levels for R, G, and B are set in conjunction with the scratch correction levels for R, G, and B according to the white balance correction mode that corrects the color temperature of the light source during shooting. Therefore, there is an effect of enabling defect correction adapted to various shooting conditions with different light sources.

(Second Embodiment)
In the first embodiment, the scratch correction level is set differently for R, G, and B. However, there is of course no problem even if the scratch correction level is set differently for R, G, and B.

  For example, as shown in FIG. 10B, the scratch correction level corresponding to the ISO sensitivity and the shutter speed Tv is set in three levels of LEVEL1, LEVEL2, and LEVEL3, and the number of scratch corrections in the shipping data is 500 and 1000, respectively. 5000 pieces.

  When the ISO is 400 or less and the shutter speed is 1 second or less, 500 is set as the number of flaw corrections. When the ISO exceeds 400 and the shutter speed also exceeds 1 second, 1000 is set as the number of defect corrections.

  Next, white balance gain correction is performed (step S510).

  Here, the white balance gain correction will be described. When the white balance correction for correcting the difference in color temperature of the light source at the time of shooting is performed, a different gain is applied to each color of R, G, and B. As a result, the level of scratches will change for each color.

  As shown in FIG. 9C, the white balance mode set at the time of shooting, for example, the R gain, G gain, and B gain set for each of the sunlight mode, the fluorescent lamp mode, and the bulb mode are used. According to the arithmetic expression shown in d), the number of scratch corrections (R, G, B) is set for each of R, G, B.

  Next, the flaw data set for each of R, G, and B is read (step S511). In step S511, the R, G, and B data (DataR, DataG, and DataB) stored in the nonvolatile memory 56 or the built-in memory of the system control circuit 50 are scratched to R, G, and B respectively. Read the address information of the number of scratch corrections set from the largest, and return.

(Other embodiments)
In the present embodiment, fixed R, G, and B gains corresponding to three types of white balance modes are selected. However, auto white balance (AWB) that performs white balance correction by calculating from a captured image. ) Mode, manual white balance mode for calculating R, G, B gain for white balance correction from a specified image, or setting an arbitrary color temperature to set R, G, B gain, white The color temperature specified white balance mode for performing balance correction, but the R.D. Of course, there is no problem even if each gain of G and B is used.

  In the present embodiment, a defect correction level is set for each color of R, G, and B, and stored in the nonvolatile memory 56 or the built-in memory of the system control circuit 50. The address information related to the scratches with the scratch level equal to or higher than the scratch correction level set to each of R, G, and B is read from each data (DataR, DataG, DataB), but the data (DataR1) divided in advance for each scratch level. , DataR2, DataR3), (DataG1, DataG2, DataG3), (DataB1, DataB2, DataB3) are stored in the nonvolatile memory 56 or the built-in memory of the system control circuit 50, and each of R, G, and B has a white balance R , G, B table according to the gain Even if the constant no of course a problem.

  In this embodiment, there are three types of color division, R, G, and B, but it is of course possible to perform processing according to the number of color filters applied to the image sensor 14.

  In this embodiment, the color filter color applied to the image sensor 14 is divided into R, G, and B, but has spectral characteristics of Magenta (M), Yellow (Y), and Cyan (C). Of course, it is possible to use an image sensor.

  In this embodiment, the scratch correction LEVEL has three stages. However, the present invention is not limited to this, and there is of course no problem if the shutter speed or ISO division is changed to increase or decrease the scratch correction level.

  Further, in the present embodiment, the case where the photographing operation is performed by moving the mirror 130 between the mirror up position and the mirror down position has been described. However, the mirror 130 is configured as a half mirror so that the photographing operation is performed without moving. Of course there is no problem.

  In this embodiment, the recording media 200 and 210 are not only memory cards such as PCMCIA cards and compact flash (registered trademark), hard disks, but also micro DAT, magneto-optical disks, CD-Rs, CD-RWs, and the like. Of course, there is no problem even if it is constituted by a phase change optical disk such as an optical disk or DVD. Further, there is no problem even if the recording media 200 and 210 are composite media in which a memory card and a hard disk are integrated. In this case, of course, there is no problem even if a part of the composite medium is detachable.

In this embodiment, the recording media 200 and 210 are separated from the image processing apparatus 100 and can be arbitrarily connected. However, any or all of the recording media are fixed to the image processing apparatus 100. It may be left alone. Of course, there is no problem even if the recording medium 200 or 210 can be connected to the image processing apparatus 100 by an arbitrary number or a plurality of recording media.
In this embodiment, the recording mediums 200 and 210 are described as being mounted on the image processing apparatus 100. However, there is of course no problem if the recording medium has a single or a plurality of combinations.

  It goes without saying that the present invention can also be applied to a case where the present invention is achieved by supplying software program codes for realizing the functions of the above-described embodiments to a system or apparatus. In this case, the program code itself realizes the novel function of the present invention, and the program itself and the storage medium storing the program constitute the present invention.

  In the above embodiment, the program codes shown in the flowcharts of FIGS. 2 to 8 are stored in the ROM that is a storage medium. The storage medium for supplying the program code is not limited to the ROM, and for example, a flexible disk, a hard disk, a nonvolatile memory card, or the like can be used.

It is a block diagram which shows the structure of the electronic camera in embodiment of this invention. It is a figure which shows the flowchart of the main routine in the electronic camera in embodiment of this invention. It is a figure which shows the flowchart of the main routine in the electronic camera in embodiment of this invention. It is a figure which shows the flowchart of the main routine in the electronic camera in embodiment of this invention. It is a flowchart which shows the ranging / photometry processing procedure in step S114. It is a flowchart which shows the imaging | photography process sequence in step S128. It is a flowchart which shows the defect correction process procedure in step S129. It is a flowchart which shows the defect correction data read-out process procedure in step S401. It is a figure which shows the detail of the crack correction data read-out process in step S509,510. It is a figure which shows the detail of the defect correction data read-out process of 2nd Embodiment in step S509,510.

Explanation of symbols

14 Image sensor 44 Thermometer 50 System control circuit 56 Non-volatile memory 60 Mode dial 62 Shutter switch SW1
64 Shutter switch SW2
69 ISO sensitivity setting switch 100 Image processing apparatus

Claims (19)

  An image sensor having a plurality of pixels having different spectral characteristics, a correction data storage means having information on an address and a level for correcting an output of a defective pixel of the image sensor, and a plurality of pixel outputs having the different spectral characteristics Correction level setting means for setting a different level for each, and correction data according to the set level for each of the different spectral characteristics set by the correction level setting means from the correction data stored in the correction data storage means An image pickup apparatus comprising: correction data reading means for reading out image data; and defective pixel correction means for correcting defective pixels with respect to the output of the image pickup device using the read correction data.   The plurality of pixels having different spectral characteristics have spectral characteristics of at least Red (R), Green (G), Blue (B), Magenta (M), Yellow (Y), and Cyan (C). An imaging device.   The correction data storage means has address information corresponding to a plurality of pixels having different spectral characteristics, and information related to an output level in darkness.   The correction level setting means is an image pickup apparatus that sets a correction level according to an output ratio of pixels having different spectral characteristics generated due to a difference in color temperature of a light source.   5. The imaging apparatus according to claim 4, wherein the correction level setting means lowers the correction level as the output of a pixel having different spectral characteristics generated due to a difference in color temperature of the light source is lower.   The correction data reading unit reads an address corresponding to a pixel having a level equal to or higher than the correction level set by the correction level setting unit with respect to the correction data stored in the correction data storage unit. An imaging device.   An image sensor having a plurality of pixels having different spectral characteristics, a correction data storage means having information on an address and a level for correcting an output of a defective pixel of the image sensor, and a plurality of pixel outputs having the different spectral characteristics Correction number setting means for setting a different number of corrections for each, and the set number for each of the different spectral characteristics set by the correction number setting means from the correction data stored in the correction data storage means An imaging apparatus comprising: correction data reading means for reading correction data in accordance with the correction data; and defective pixel correction means for correcting defective pixels with respect to the output of the imaging device using the read correction data.   8. The imaging device according to claim 7, wherein the plurality of pixels having different spectral characteristics are at least Red (R), Green (G), Blue (B), or Magenta (M), Yellow (Y), and Cyan (C). An imaging device having spectral characteristics.   8. The imaging apparatus according to claim 7, wherein the correction data storage means includes address information corresponding to a plurality of pixels having different spectral characteristics and information relating to an output level in the dark.   8. The imaging apparatus according to claim 7, wherein the correction number setting means sets the correction number in accordance with an output ratio of pixels having different spectral characteristics generated due to a difference in color temperature of the light source.   11. The imaging apparatus according to claim 10, wherein the correction number setting means increases the correction number as the output of the pixel having different spectral characteristics generated due to the difference in color temperature of the light source is lower.   8. The image pickup apparatus according to claim 7, wherein the correction data reading means uses the correction data stored in the correction data storage means, and the correction data read from the one having a high scratch level to the correction number set by the correction number setting means. An image pickup apparatus having correction data reading means for reading an address corresponding to a pixel.   Different levels are output for each of the plurality of pixel outputs having different spectral characteristics from the correction data having information on the address and level for correcting the output of the defective pixel of the imaging device having the plurality of pixels having different spectral characteristics. With the correction data read method set by the correction level setting method to be set and read out the correction data in accordance with the set level for each of the set different spectral characteristics, the output of the image sensor is read using the correction data read out. A correction processing method comprising correcting a defective pixel.   14. The correction processing method according to claim 13, wherein the plurality of pixels having different spectral characteristics are at least Red (R), Green (G), Blue (B), Magenta (M), Yellow (Y), and Cyan (C). A correction processing method characterized by having the following spectral characteristics:   14. The correction processing method according to claim 13, wherein the correction level setting method sets a correction level according to an output ratio of pixels having different spectral characteristics generated due to a difference in color temperature of a light source. Method.   Correction for setting a different level for each pixel output of the different spectral characteristics from correction data having information on the address and level for correcting the output of the defective pixel of the image sensor having a plurality of pixels having different spectral characteristics A step of setting by a level setting method, and a step of reading by a correction data reading method of reading correction data in accordance with the set level for each of the set different spectral characteristics. A correction processing computer program comprising a step of correcting a defective pixel with respect to an output of the image sensor using data.   17. The correction processing computer program according to claim 16, wherein the plurality of pixels having different spectral characteristics are at least Red (R), Green (G), Blue (B), Magenta (M), Yellow (Y), and Cyan (C The computer program for correction processing having the spectral characteristics of   17. The correction processing computer program according to claim 16, wherein the correction level setting method sets a correction level in accordance with an output ratio of pixels having different spectral characteristics generated due to a difference in color temperature of a light source. Processing computer program.   17. A storage medium storing the correction processing computer program according to claim 16.

Images