JP4819479B2 - Imaging apparatus and image data correction method - Google Patents

Description

  The present invention relates to an imaging apparatus and a method for correcting image data, for example, a technique suitable for use in performing image processing.

  Currently, an imaging device such as an electronic camera that records and reproduces a still image or a moving image 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 is already on the market.

  When imaging using a solid-state imaging device such as the CCD or CMOS, the defective pixel is corrected and the captured image data is corrected for image quality deterioration due to dark current noise generated in the imaging device or a minute scratch peculiar 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, defective pixel 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.

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

  Thereby, image data (defective image data) including a pixel (that is, defective pixel) that outputs a signal of a specific level among video signals obtained by the image sensor is corrected, and a good reproduced image can be obtained. (For example, refer to Patent Document 1).

JP 2003-333435 A

  Defective pixels include the one that increases the output level of one pixel due to the so-called dark current that occurs at the temperature and accumulation time of the image sensor as described above, as well as the wiring leak in the device of the image sensor and the impact of electrons. In recent years, it has been found that there are micro-luminescences caused by ionization and the like that affect the output level of peripheral pixels.

  FIG. 9 is a diagram showing that defective pixels are spread as the accumulation time becomes longer. As shown in FIG. 9 (a), one pixel was defective in the accumulation time of 4 seconds, but 10 seconds as shown in FIG. 9 (b), 20 seconds as shown in FIG. 9 (c), and FIG. 9 (d). As can be seen from the graph, when the storage time is long, such as 40 seconds, the time increases as the time increases centering on the defective pixel generated during the storage time of 1 second. Due to recent advances in noise suppression technology for image sensors, image quality improvement over a long period of time is desired more than ever.

  However, in the conventional technique, since the defective pixel correction is performed on the pixel corresponding to the address information of the defective pixel detected in advance, it is not assumed that the range of the defective pixel is expanded as the accumulation time increases. However, there is a problem that a correction error occurs when the accumulation time is long.

  In order to cope with the problem that a correction error occurs due to an increase in the range of defective pixels due to the long accumulation time described above, it is conceivable to expand the range of defective pixel correction. However, if the range of defective pixel correction is expanded more than necessary, the efficiency of defective pixel correction processing will be reduced, and a large burden will be placed on the CPU and other circuits, increasing the size and manufacturing cost of the device. There was a problem of end.

  In view of the above-described problems, the present invention makes it possible to perform defective pixel correction that does not cause a correction error due to a difference in accumulation time, and to perform defective pixel correction within a necessary minimum range. The purpose is to be.

An image pickup apparatus according to the present invention includes an image pickup element composed of a plurality of pixels, storage means for storing address information of defective pixels of the image pickup element, and a correction range set around a pixel corresponding to the address information. A defective pixel correction unit that corrects a signal output from the pixel, and the correction range is widened as the accumulation time of the image sensor increases, and the accumulation time of the image sensor is equal to or longer than a predetermined time, or the correction range Control means for controlling the correction range to be fixed when the value reaches a predetermined range.
Another feature of the imaging device of the present invention is that it corresponds to the address information, an image sensor composed of a plurality of pixels, storage means for storing address information of defective pixels of the image sensor, and A defective pixel correction unit that corrects a signal output from a pixel in a correction range that is set centering on the pixel to be operated, and the correction range is widened as the shutter speed is slow, and the shutter speed is equal to or higher than a predetermined speed, And a control unit that controls the correction range to be fixed when the correction range reaches a predetermined range.
Another feature of the imaging device of the present invention is that the imaging device includes a plurality of pixels, storage means for storing address information of defective pixels of the imaging device, and correspondence to the address information. A defective pixel correction unit that corrects a signal output from a pixel in a correction range set around the pixel to be changed, and the setting of the correction range is changed according to shooting conditions, and the correction range exceeds a predetermined range Control means for performing accumulation in the dark for the same time as the accumulation time of the image sensor and performing subtraction processing with the output of the image sensor accumulated in the dark.

An image data correction method according to the present invention includes a step of reading out address information of a defective pixel of an image sensor composed of a plurality of pixels from a storage unit, and a pixel in a correction range set around the pixel corresponding to the address information. A defective pixel correction step for correcting an output signal and the correction range is expanded as the accumulation time of the image sensor becomes longer, and the accumulation range of the image sensor is equal to or longer than a predetermined time, or the correction range is a predetermined range And a control step of controlling the correction range to be fixed when the value reaches the value.
Another feature of the image data correction method of the present invention is that a step of reading out address information of a defective pixel of an image sensor composed of a plurality of pixels from a storage means, and a pixel corresponding to the address information A defective pixel correction step for correcting a signal output from a pixel in the correction range set as the center, and the correction range is expanded as the shutter speed becomes slower and the shutter speed is equal to or higher than a predetermined speed, or the correction range is And a control step of controlling the correction range to be fixed when the predetermined range is reached.
Another feature of the image data correction method of the present invention is that a step of reading out address information of a defective pixel of an image sensor composed of a plurality of pixels from a storage means, and a pixel corresponding to the address information A defective pixel correction step for correcting a signal output from a pixel in the correction range set as the center, and the setting of the correction range is changed according to shooting conditions, and the imaging element when the correction range exceeds a predetermined range And a control step of performing control so that accumulation is performed in the dark for the same time as the accumulation time of the image, and subtraction processing is performed using the output of the image sensor accumulated in the dark.

  According to the present invention, based on the address information of the defective pixel of the image sensor stored in the storage means, the range for performing defective pixel correction is expanded as the accumulation time is increased, or the range is increased as the shutter speed is decreased. The correction range is fixed when the accumulation time is longer than the predetermined time, when the shutter speed is higher than the predetermined speed, or when the correction range reaches the predetermined range. It is possible to perform correction, and it is possible to perform necessary minimum defective pixel correction that matches the shutter speed and accumulation time. As a result, it is possible to satisfactorily prevent deterioration in image quality due to the difference in accumulation time without increasing the size of the apparatus or increasing the manufacturing cost.

(First embodiment)
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. Note that the imaging apparatus of this embodiment is applied to an electronic camera.

FIG. 1 is a block diagram illustrating a configuration example of an electronic camera according to the present embodiment.
In FIG. 1, 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, and reference numeral 14 denotes an image sensor that converts an optical image into an electric signal.

  The light beam incident on the photographing lens 310 in the lens unit 300 is an optical image on the image sensor 14 guided by the single-lens reflex system through the diaphragm 312, the outer lens mount 306, the inner lens mount 106, the first mirror 130 and the shutter 12. To form an image.

  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 image data sent from the A / D converter 16 or the image data sent from the memory control circuit 22. The image processing circuit 20 performs predetermined calculation processing using image data captured as necessary, and the system control circuit 50 performs exposure (shutter) control unit 40 and first distance measurement control based on the obtained calculation result. A TTL (through-the-lens) AF (autofocus) process, an AE (automatic exposure) process, and an EF (flash dimming) process for controlling the unit 42 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 this embodiment, since the first distance measurement control unit 42 and the photometry control unit 46 are provided exclusively, the system control circuit 50 uses the first distance measurement control unit 42 and the photometry control unit 46. AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash light control) processing are performed, and the image processing circuit 20 is used to perform AF (autofocus) processing, AE (automatic exposure) processing, and EF. The (flash dimming) process may be configured not to be performed.

  The first distance measurement control unit 42 and the photometry control unit 46 are used to perform AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash light control) processing, and an image processing circuit. 20 may be configured to perform AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash light control) processing.

  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 first memory 30, and the compression / decompression circuit 32. To do.

  The image data sent from the A / D converter 16 is written to the image display memory 24 or the first 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 denotes an image display memory, and reference numeral 26 denotes 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 first memory for storing captured still images and moving images, and has a storage capacity sufficient to store a predetermined number of still images and moving images for a predetermined time. 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 first memory 30 at high speed. The first 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 first memory 30, performs compression processing or decompression processing, and finishes the processing. Data is written to the first memory 30.

  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 sent from the photometry control unit 46. Reference numeral 42 denotes a first distance measurement control unit for performing AF (autofocus) processing. A light beam incident on the photographing lens 310 in the lens unit 300 is used for a diaphragm 312, an outer lens mount 306, an inner lens mount 106, and a first one. The in-focus state of an image formed as an optical image is measured by entering with a single-lens reflex system through a mirror 130 and a distance measuring sub-mirror (not shown).

  A thermometer 44 detects the ambient temperature in the photographing environment. When the thermometer is in the image sensor (sensor) 14, the dark current of the sensor can be predicted more accurately.

  Reference numeral 46 denotes a photometric control unit for performing AE (automatic exposure) processing. Light beams incident on the photographing lens 310 in the lens unit 300 are converted into a diaphragm 312, an outer lens mount 306, an inner lens mount 106, and a first mirror 130. In addition, the exposure state of an image formed as an optical image is measured by entering with a single-lens reflex system through a photometric sub-mirror (not shown).

  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 captured by the image sensor 14, the system control circuit 50 performs 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 second distance measurement control unit 342.

  Further, AF (autofocus) control is performed using the measurement result obtained by the first distance measurement control unit 42 and the calculation result obtained by calculating the image data captured by the image sensor 14 by the image processing circuit 20. Also good. 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 second memory that stores constants, variables, programs, and the like for operation of 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 in a single or a plurality of places near 70 that are easily visible. 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 display, exposure compensation display, flash display, red-eye reduction display, macro shooting display, buzzer setting display, battery level display for clock, battery level display, error display, multi-digit number information display, There are an attachment / detachment state display of the first recording medium 200 and the second recording medium 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 displayed on the display unit 54, the display in the optical viewfinder 104 includes in-focus display, photographing preparation completion display, camera shake warning display, flash charge display, flash charge completion display, shutter speed display. , Aperture value display, exposure correction display, recording medium writing operation display, and the like.

  Further, among the display contents displayed on the display unit 54, the display 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 There are an operation display, a macro shooting setting notification display, a secondary battery charge display, and the like.

  Among the display contents displayed on 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 non-volatile memory in which programs and the like to be described later are stored. As the non-volatile memory 56, an EEPROM or the like is used. The nonvolatile memory 56 stores various parameters, setting values such as ISO (International Organization for Standardization) sensitivity, setting mode, and defective pixel position and level data.

  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 denote operation materials for inputting various operation instructions of the system control circuit 50, and one or a plurality of switches, dials, touch panels, pointing by line-of-sight detection, voice recognition devices, etc It is composed of the combination. Details of these operation members and the like 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. It is possible to switch and set each function shooting mode such as a shooting mode, a sports shooting mode, a night view shooting mode, and a panoramic shooting mode.

  Reference numeral 62 denotes a first shutter switch (SW1) which is turned on during the operation of a shutter button (not shown), and performs AF (auto focus) processing, AE (automatic exposure) processing, AWB (auto white balance) processing, EF Instructs the start of operations such as (flash dimming) processing.

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

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

  Reference numeral 68 denotes a single / continuous shooting switch. When the second shutter switch 64 is pressed, a single shooting mode in which one frame is shot to enter a standby state and the second shutter switch 64 is continuously pressed. Thus, it is possible to set a continuous shooting mode in which shooting continues.

  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 movement-(minus) button, playback image movement + (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 / switching button for setting selection and switching of various functions when executing, a determination / execution button for setting determination and execution of various functions when performing shooting and playback in panorama mode, etc. Image display ON / OFF switch to set ON / OFF, image data taken immediately after shooting A quick review ON / OFF switch for setting a quick review function for automatic reproduction, a JPEG compression ratio is selected, or a signal from the image sensor 14 is directly digitized and recorded on the first and second recording media 200 and 210. When the first shutter switch is pressed, a compression switch that is a switch for selecting a CCD RAW mode to be used, a playback switch that can set a function mode such as a playback mode, a multi-screen playback / erase mode, and a PC connection mode. The auto-focus operation can be started. Once focused, the one-shot AF mode that keeps the in-focus state and the servo AF mode that keeps the auto-focus operation continuously while pressing the first shutter switch can be set. AF mode setting switch.

  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 72 denotes a power switch, which can 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 connected to the image processing apparatus 100, the external strobe, and the first and second recording media 200 and 210 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 unit including the recording media 200 and 210 for a necessary period.

  Reference numerals 82 and 84 denote a first inner connector and a first outer connector, respectively, and 86 denotes a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, NiMH battery, or Li battery, or an AC adapter. It is a power supply part.

  Reference numeral 90 denotes a first interface with a first recording medium 200 such as a memory card or a hard disk, and reference numeral 94 denotes a second interface with a second recording medium 210 such as a memory card or a hard disk.

  Reference numerals 92 and 96 denote a second inner connector and a third inner connector for connection to the first and second recording media 200 and 210 such as a memory card and a hard disk, and 98 denotes a second and third inner connector. Reference numerals 92 and 96 denote recording medium attachment / detachment detectors that detect whether the first and second recording media 200 and 210 are attached.

  In the present embodiment, two interfaces and connectors for attaching the recording medium are provided. However, a single interface or connectors for attaching the recording medium may be provided. Further, as interfaces and connectors of different standards, those compliant with standards such as PCMCIA cards and CF (compact flash (registered trademark)) cards may be used.

  Further, when the first and second interfaces 90 and 94 and the second and third connectors 92 and 96 are configured using a standard conforming to a PCMCIA card or a CF (Compact Flash (registered trademark)) card. Image data with peripheral devices such as other computers and printers by connecting various communication cards such as LAN cards, modem cards, USB cards, IEEE1394 cards, P1284 cards, SCSI cards, PHS, etc. And management information attached to image data can be transferred to each other.

  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, a first mirror 130, and a second mirror 132 by an SLR method, and forms an optical image. It is possible to display the image. 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 a third interface for connecting the image processing apparatus 100 to the lens unit 300 in the lens mount 106. Reference numeral 122 denotes a fourth inner connector that electrically connects the image processing apparatus 100 to the lens unit 300. In the present embodiment, the lens mount 106 and / or the fourth inner connector 122 includes a lens attachment / detachment detection unit (not shown) that detects whether or not the lens unit 300 is attached.

  The fourth inner connector 122 transmits a control signal, a status signal, a data signal, 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. The fourth inner 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 first and second mirrors, respectively, which guide light rays incident on the photographing lens 310 to the optical viewfinder 104 by a single-lens reflex system. The second mirror 132 may be either a quick return mirror or a half mirror.

  Reference numeral 200 denotes a first recording medium such as a memory card or a hard disk. The first recording medium 200 includes a first recording unit 202 configured by a semiconductor memory, a magnetic disk, and the like, a fourth interface 204 with the image processing apparatus 100, and a second interface that connects the image processing apparatus 100. And an outer connector 206.

  Reference numeral 210 denotes a second recording medium such as a memory card or a hard disk, similar to the first recording medium 200. The second recording medium 210 includes a second recording unit 212 configured by a semiconductor memory, a magnetic disk, or the like, a fifth interface 214 with the image processing apparatus 100, and a third interface for connecting to the image processing apparatus 100. And an outer connector 216.

  Reference numeral 300 denotes an interchangeable lens type lens unit. Reference numeral 306 denotes an outer lens mount that mechanically couples the lens unit 300 to the image processing apparatus 100. Various functions for electrically connecting the lens unit 300 to the image processing apparatus 100 are included in the outer lens mount 306.

  Reference numeral 310 denotes a photographing lens, and 312 denotes an aperture. Reference numeral 320 denotes a sixth interface for connecting the lens unit 300 to the image processing apparatus 100 in the outer lens mount 306. Reference numeral 322 denotes a fourth outer connector that electrically connects the lens unit 300 to the image processing apparatus 100.

  The fourth outer 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 fourth outer 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. Reference numeral 342 denotes a second distance measurement control unit that 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 block configuration will be described.
2, 3, and 4 are flowcharts illustrating an example of a shooting operation processing procedure of the image processing apparatus 100 according to the present embodiment. This processing program is stored in a storage medium such as the nonvolatile memory 56, loaded into the second memory 52, and executed by the CPU in the system control circuit 50.

  In FIG. 2, when power is turned 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). ). Next, the system control unit 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).

  As a result of this determination, if 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 nonvolatile. The data is recorded in the memory 56, and the power control unit 80 performs a predetermined end process (step S103) such as shutting off unnecessary power of each unit of the image processing apparatus 100 including the image display unit 28. And it is discriminate | determined whether all the imaging operation processes are complete | finished (step S110). As a result of the determination, if all the imaging operation processes are not completed, the process returns to step S102. On the other hand, as a result of the determination in step S110, when all the imaging operation processing is to be ended, the processing is ended as it is.

  On the other hand, if the power switch 72 is set to ON as a result of the determination in step S102, the remaining capacity of the power source such as a battery controlled by the power control unit 80 and the operation status are controlled by the system control circuit 50 by image processing. It is determined whether or not there is a problem in the operation of the apparatus 100 (step S104). If it is determined that there is a problem as a result of this determination, a predetermined warning (step S105) is given by displaying an image or outputting sound on the display unit 54, and then the process returns to step S102.

  On the other hand, if it is determined in step S104 that there is no problem with the power supply, the system control circuit 50 determines the setting position of the mode dial switch 60 and determines whether the mode dial switch 60 is set to the shooting mode. It is determined whether or not the mode is set (step S106). As a result of the determination, if 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 after execution, the processing of step S102 is performed. Return.

  On the other hand, if the result of the determination in step S106 is that the mode dial switch 60 is set to the shooting mode, it is determined whether or not the first and second recording media 200 and 210 are loaded, the first and second Management information of the image data recorded in the recording media 200 and 210, and the operating states of the first and second recording media 200 and 210 are the operations of the image processing apparatus 100, particularly the first and second recording media 200. , 210 determines whether there is a problem in the recording / reproducing operation of the image data (step S108). If it is determined that there is a problem as a result of this determination, a predetermined warning (step S105) is given by displaying an image or outputting sound on the display unit 54, and then the process returns to step S102.

  On the other hand, if it is determined that there is no problem as a result of the determination in step S108, the system control circuit 50 displays various setting states of the image processing apparatus 100 with 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 using the image display unit 28 by an image or sound.

  Next, in FIG. 3, it is determined whether or not the first shutter switch 62 (SW1) is pressed (step S113). If the result of this determination is that the first shutter switch 62 has not been pressed, processing returns to step S102. On the other hand, if the result of determination in step S113 is that the first shutter switch 62 has been pressed, the system control circuit 50 performs distance measurement processing to focus the photographing lens 310 on the subject and perform photometry processing. Distance measurement / photometry processing for determining the aperture value and shutter speed is performed (step S114). In the photometric process, the flash is set if necessary.

  Next, it is determined whether or not the second shutter switch 64 (SW2) is pressed (step S115). If the result of this determination is that the second shutter switch 64 has not been pressed, it is determined whether or not the first shutter switch 62 has been released (step S116). If the result of this determination is that the first shutter switch 62 has not been released, processing returns to step S115.

  On the other hand, if the result of determination in step S116 is that the first shutter switch 62 has been released, the process proceeds to step S102. If it is determined in step S115 that the second shutter switch 64 has been pressed, the process proceeds to step S126.

  Next, in FIG. 4, the system control circuit 50 determines whether or not the first memory 30 has an image storage buffer area in which captured image data can be stored (step S126). As a result of this determination, if it is determined that there is no area where new image data can be stored in the image storage buffer area of the first memory 30, a predetermined warning (by displaying an image or outputting sound on the display unit 54). After performing 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 first memory 30, the first image to be read from the first memory 30 and written to the recording media 200, 210 is This is the case where the recording medium 200 or 210 has not yet been recorded, and one free area cannot yet be secured in the image storage buffer area of the first memory 30.

  Note that when the captured image data is compressed and stored in the image storage buffer area of the first memory 30, the amount of image data after compression differs depending on the compression mode setting. Whether or not the storable area is on the image storage buffer area of the first memory 30 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 first memory 30, the imaging signal is captured by the system control circuit 50 and accumulated for a predetermined time. To the predetermined area of the first 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. A photographing process for writing the photographed image data 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 defect 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 also be described later.

  Next, the process proceeds to development processing (step S130). Specifically, the system control circuit 50 reads a part of the image data written in a predetermined area of the first memory 30 through the memory control circuit 22 and performs WB (white balance) necessary for development processing. ) Integration calculation processing and OB (optical black) integration calculation processing are 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 reads out the captured image data written in the predetermined area of the first memory 30 using the memory control circuit 22 and, if necessary, the image processing circuit 20, and the internal memory of the system control circuit 50 Alternatively, various development processes including an AWB (auto white balance) process, a gamma conversion process, and a color conversion process are performed using the calculation result stored in the memory 52 (step S130).

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

  Then, the image data stored in the image storage buffer area of the first memory 30 is read by the system control circuit 50, and the memory card or the compact flash (registered trademark) card is read via the interfaces 90 and 94 and the connectors 92 and 96. The recording process for writing the read image data to the first and second recording media 200 and 210 such as the above is started (step S132).

  This recording start process is performed on the image data every time new image data is written in the empty image portion of the image storage buffer area of the first memory 30 and the series of processes is completed. Is done.

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

  Next, the system control circuit 50 determines whether or not the first shutter switch 62 (SW1) is being pressed (step S133). If the result of this determination is that the first shutter switch 62 has been released, processing returns to step S102.

  On the other hand, if the result of determination in step S133 is that the first shutter switch 62 has been pressed, it is determined whether or not single shooting has been set (step S134). If it is determined as a result of this determination that continuous shooting has been performed, the process returns to step S115 to proceed to the next shooting. If it is determined in step S134 that single shooting has been performed, the process returns to step S133, and the current process is repeated until the first shutter switch 62 is released. As described above, a series of processing relating to photographing is completed.

  FIG. 5 is a flowchart showing an example of the distance measurement / photometry processing procedure in step S114 of FIG. In the distance measurement / photometry processing, various signals are exchanged between the system control circuit 50 and the aperture control unit 340 or the second distance measurement control unit 342. The third interface 120, the fourth inner connector 122, the second 4 outside connector 322, sixth interface 320 and lens system control circuit 350.

  In FIG. 5, the system control circuit 50 starts an AF (autofocus) process using the image sensor 14, the first distance measurement control unit 42, and the second distance measurement control unit 342 (step S201).

  Next, the system control circuit 50 causes the light incident on the photographic lens 310 to pass through the aperture 312, the outer lens mount 306, the inner lens mount 106, the first mirror 130, and a distance measuring sub-mirror (not shown). By making the light incident on the first distance measurement control unit 42, AF control for detecting an in-focus state is performed using the distance measurement control unit 42 while driving the photographing lens 310 using the distance measurement control unit 342 ( Step S202).

  Next, the in-focus state of the image formed as an optical image is determined (step S203). If it is determined that the in-focus state is not obtained as a result of the determination, the process returns to step S202.

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

  Next, the system control circuit 50 starts AE (automatic exposure) processing using the photometry control unit 46 (step S205). Then, the system control circuit 50 converts the light incident on the photographing lens 310 into a diaphragm 312, an outer lens mount 306, an inner lens mount 106, a first mirror 130, a second mirror 132, and a photometric lens (not shown). Then, the exposure state of the image formed as an optical image is measured, and the exposure (shutter) control unit 40 is used to perform photometry processing (step S206). ).

  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 shooting 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).

  Next, it is determined whether or not the exposure (AE) is appropriate (step S207). As a result of this determination, if it is determined that the exposure (AE) is not appropriate, the process returns to step S206. If the exposure (AE) is determined to be appropriate as a result of the determination in step S207, the system control circuit 50 determines whether flash is necessary from the measurement data obtained in the photometry process in step S206. Is determined (step S208).

  If the result of this determination is that a flash is not required, the distance measurement / photometry process ends as it is. On the other hand, if the result of determination in step S208 is that flashing is necessary, the flash flag is set and the flash unit 48 is charged until charging is completed (step S209).

  Next, it is determined whether or not the charging of the flash unit 48 has been completed (step S210). As a result of this determination, if not completed, the process returns to step S209 and is repeated until charging is completed. If charging is completed as a result of the determination in step S210, the process is terminated and the process returns to the main process.

  FIG. 6 is a flowchart showing an example of the photographing processing procedure in step S128 of FIG. In this photographing process, various signals are exchanged between the system control circuit 50 and the aperture control unit 340 or the second distance measurement control unit 342. The third interface 120, the fourth inner connector 122, and the fourth This is done via the outer connector 322, the sixth interface 320 and the lens system control circuit 350.

  In FIG. 6, when the process is started, the system control circuit 50 moves the first mirror 130 to the mirror-up position by a mirror driving unit (not shown) (step S301). Next, the aperture control unit 340 drives the aperture 312 to a predetermined aperture value according to the photometric data stored in the internal memory of the system control circuit 50 or the second memory 52 (step S302).

  Next, the system control circuit 50 performs the charge clear operation of the image sensor 14 (step S303), and starts the charge accumulation of the image sensor 14 (step S304). Then, the shutter 12 is opened under the control of the shutter control unit 40 (step S305), and exposure of the image sensor 14 is started (step S306).

  Next, it is determined whether or not the flash unit 48 is necessary based on the flash flag (step S307). As a result of this determination, if necessary, the flash unit 48 is caused to emit light (step S308), and the process proceeds to step S309. On the other hand, if the result of determination in step S307 is not necessary, the process jumps to step S309.

  Next, the system control circuit 50 determines whether or not the exposure of the image sensor 14 is finished according to the photometric data (step S309). If the exposure is not completed as a result of the determination, the process waits until the exposure is completed. If the exposure is completed as a result of the determination in step S309, the shutter 12 is closed by the control from the shutter control unit 40 (step S310), and the exposure of the image sensor 14 is ended.

  Next, the system control circuit 50 drives the aperture 312 to the open aperture value by the aperture control unit 340 (step S311), and moves the first mirror 130 to the mirror down position by the mirror drive unit (not shown). (Step S312).

  Then, it is determined whether or not the set charge accumulation time has elapsed (step S313). As a result of this determination, if the set charge accumulation time has not elapsed, the process waits until it elapses. As a result of the determination in step S313, if the set charge accumulation time has elapsed, the system control circuit 50 ends the charge accumulation of the image sensor 14 (step S314).

  Next, a charge signal is read out from the image sensor 14, and the first signal is output from the A / D converter 16, the image processing circuit 20 and 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 into a predetermined area of the first memory 30 (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 flowchart showing an example of a defect correction processing procedure in step S129 of FIG.
In FIG. 7, the system control circuit 50 of the image processing apparatus 100 first 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 data that holds information relating to the address of the defective pixel selected according to the type of defective pixel detected in advance.

The scratch correction data read sequence will be described in detail with reference to FIG.
FIG. 8 is a flowchart showing an example of a correction data read processing procedure for flaw correction in step S401 of FIG.

  When the image sensor 14 is shipped, various flaw pixels (defective pixels) are extracted from image data obtained at a predetermined environmental temperature and a predetermined charge accumulation time. Specifically, a pixel having an output exceeding a predetermined level set with reference to the median value (median value) of the peripheral pixels is detected as a defect. These flaw pixels detect whether or not the addresses of defective pixels exist adjacent to each other, are separated for each of R, G, and B, and are divided into types. Then, data to be stored in the memory in the image processing apparatus 100 is formed based on the shipping data in which the address and the scratch level are described. This process is performed outside the image processing apparatus 100.

  Scratch pixel types are generated due to dust or the like, generated due to low pixel sensitivity, generated due to a large amount of dark current, generated due to leaks in the circuit near the pixel or minute light emission. It is classified according to several causes, such as those that do not respond to light and pixels that do not respond to light. Then, it is classified into a flaw correction table for each use condition such as environmental temperature and shutter speed. In the present embodiment, the scratch table that does not depend on the shutter speed is 1, and the scratch table that changes the scratch size depending on the shutter speed is 2.

  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). ). Next, the shutter speed (Tv) is confirmed (step S502), and 1 is entered in the table setting information (TABLE) for flaw correction (step S503).

  Next, it is determined whether or not the shutter speed exceeds 1 second. As a result of this determination, if it exceeds 1 second, 2 is further added to the TABLE for scratch correction (step 505). If the result of determination in step S504 does not exceed 1 second, the process jumps to step S506.

  Next, scratch correction data is read (step S506). In step S506, the table of setting values input in the table setting information (TABLE) is read. If 1 is entered in TABLE, the address information of the scratch correction table 1 is read. If 1 and 2 are entered in TABLE, the address information of the scratch correction tables 1 and 2 is read.

  Next, it is determined whether or not the shutter speed has exceeded 8 seconds (step S507). If the result of this determination is that the shutter speed does not exceed 8 seconds, 1 is entered in the AREA that sets the magnitude for flaw correction (step S508), and the flow proceeds to step S514.

  On the other hand, if the result of determination in step S507 is that the shutter speed has exceeded 8 seconds, processing proceeds to step S509, where it is determined whether or not the shutter speed has exceeded 15 seconds. If the result of this determination is that the shutter speed does not exceed 15 seconds, 2 is entered in the AREA for setting the magnitude for flaw correction (step S510), and the flow proceeds to step S514.

  On the other hand, if the result of determination in step S509 is that the shutter speed has exceeded 15 seconds, processing proceeds to step S511, where it is determined whether or not the shutter speed has exceeded 30 seconds. If the result of this determination is that it does not exceed 30 seconds, 3 is entered in the AREA for setting the size for flaw correction (step S512), and the process proceeds to step S514.

  On the other hand, if the result of determination in step S511 is that the shutter speed has exceeded 30 seconds, processing proceeds to step S513, where 4 is entered in AREA for setting the size for flaw correction (step S513), and processing proceeds to step 514.

  In step S514, the size of the scratch correction for each AREA is set for the scratch address of the scratch correction table (TABLE2), and the scratch correction range is set. Thereafter, the present process is terminated and the process returns to the main process.

Here, the flaw correction range setting performed in step S514 will be described.
In the case of AREA = 1, a range for performing defect correction is set as a defect correction address with a pixel size of 1 × 1 centering on the pixel corresponding to the defect address in the defect correction table 2.

  In the case of AREA = 2, a range of 3 × 3 pixels centering on the pixel corresponding to the flaw address in the flaw correction table 2 is set as a flaw correction address. In the case of AREA = 3, similarly, the range of 5 × 5 around the pixel corresponding to the scratch address in the scratch correction table 2 is set as the scratch correction address. Further, in the case of AREA = 4, a range for performing the defect correction is set as a defect correction address with a size of 7 × 7 around the pixel corresponding to the defect address of the defect correction table 2.

  Returning to the description of FIG. 7, the system control circuit 50 next designates defect correction data to be used (step S402). Then, in order to compensate for the white defect of the image sensor 14, the information indicating the address of the white defect pixel described in the defect correction data designated in step S402 is referred to and written in a predetermined area of the first memory 30. Point scratch correction processing is performed on the corresponding pixels of the captured image using the captured image data of the adjacent pixels of the same color.

  Specifically, first, the system control circuit 50 reads flaw address information for one pixel from the top of the selected flaw correction data and the flaw correction address information set in step S514 (step S403). With reference to this defect correction address information, it is possible to specify the address of the corresponding pixel in the captured image written in the first memory 30.

  Next, the system control circuit 50 reads the 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 adjacent pixel value obtained in step S404 (step S405).

  Subsequently, the correction amount of the corresponding pixel calculated in step S405 is written to the corresponding address in the first memory 30 by the system control circuit 50 (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 specified defect correction data have been completed (step S407). If it is determined that the defect pixel correction process has not been completed as a result of the determination, 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, as a result of the determination in step S407, if it is determined that all the defect correction processes described in the specified defect correction data have been completed, the system control circuit 50 determines whether or not there is data to be corrected next. Judgment is made (step S408). If there is data to be corrected next as a result of this determination, the process returns to step S402, the next data to be corrected is designated, and the same processing as described above is repeated.

  On the other hand, as a result of the determination in step S408, if there is no data to be corrected, all the defect correction processes for all the defect pixels read in step S401 are completed, and all the defect correction processing sequences are completed.

  FIG. 10 is a diagram illustrating a state in which the scratches shown in FIG. 9 are subjected to scratch correction based on the scratch correction range setting set in step S514, and the scratches are corrected.

  As described above, according to the present embodiment, it is possible to prevent the image quality from being deteriorated due to the occurrence of a flaw correction error in the long-time accumulation due to the occurrence of a flaw that expands the defective pixel range depending on the accumulation time, and Necessary minimum correction of defective pixels according to the shutter speed and accumulation time has become possible.

  In addition, it is possible to perform flaw correction adapted to shooting conditions by combining single correction of pixels corresponding to defective flaw addresses and correction that corrects flaws in a predetermined range of pixels centering on flaw addresses. It became.

(Second Embodiment)
In the first embodiment, the setting of the scratch correction range is changed according to the shutter speed. However, there is no problem even if the setting of the scratch correction range is changed according to the temperature.

  Further, in the first embodiment, the same scratch correction range is set when the shutter speed is 30 seconds or more, but there is no problem even if the shutter speed is further extended and the scratch correction range is expanded. In that case, if the shutter speed exceeds the specified range or if the scratch correction range exceeds the specified range, a light-shielded image is taken with the same accumulation time as the shutter speed, and subtraction processing is performed with the image sensor output in the dark. But of course there is no problem.

  In the first embodiment, the scratch correction range is set in four stages of 1 × 1, 3 × 3, 5 × 5, and 7 × 7. However, the present invention is not limited to this, and the scratch correction range is not limited to this. The setting of is not limited to this. Of course, there is no problem even if the division of the scratch correction range is increased or decreased by changing the shutter speed, temperature, or ISO division.

  Further, in the first embodiment, the case where the first mirror 130 is moved in the mirror up position and the mirror down position to perform the photographing operation is shown. However, the first mirror 130 is moved as a half mirror configuration. Of course, there is no problem even if the photographing operation is performed without the above.

  In the first embodiment, the first and second recording media 200 and 210 include not only a memory card such as a PCMCIA card or a compact flash (registered trademark), a hard disk, but also a micro DAT, a magneto-optical disk, Of course, there is no problem even if it is composed of an optical disc such as CD-R or CD-RW, a phase change type optical disc such as DVD, or the like. Furthermore, there is no problem even if the first and second 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 the first embodiment, the first and second recording media 200 and 210 are separated from the image processing apparatus 100 and can be arbitrarily connected. The medium may remain fixed to the image processing apparatus 100. Of course, there is no problem even if the first and second recording media 200 and 210 can be connected to the image processing apparatus 100 in an arbitrary number or a plurality.

  In the first embodiment, the first and second recording media 200 and 210 have been described as being mounted on the image processing apparatus 100. However, the recording medium has a configuration of either a single or a plurality of combinations. But of course there is no problem.

(Another embodiment according to the present invention)
Each unit constituting the imaging apparatus and each step of the imaging apparatus control method in the embodiment of the present invention described above can be realized by operating a program stored in a RAM or ROM of a computer. This program and a computer-readable recording medium recording the program are included in the present invention.

  Further, the present invention can be implemented as, for example, a system, apparatus, method, program, or recording medium, and can be applied to a system composed of a plurality of devices. Moreover, you may apply to the apparatus which consists of one apparatus.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowcharts shown in FIGS. 2 to 8) for realizing the functions of the above-described embodiments is directly or remotely supplied to a system or apparatus, This includes the case where the computer of the system or apparatus also achieves by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, and the like.

  As a recording medium for supplying the program, for example, floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card ROM, DVD (DVD-ROM, DVD-R) and the like.

  As another program supply method, a client computer browser is used to connect to an Internet homepage, and the computer program itself of the present invention or a compressed file including an automatic installation function is downloaded from the homepage to a recording medium such as a hard disk. Can also be supplied.

  It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored on a recording medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. It is also possible to execute the encrypted program by using the key information and install the program on a computer.

  In addition to the functions of the above-described embodiments being realized by the computer executing the read program, the OS running on the computer based on the instructions of the program is used for the actual processing. The functions of the above-described embodiment can be realized by performing some or all of the processes.

  Furthermore, after the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion board or The CPU or the like provided in the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

It is a block diagram which shows the structural example of the electronic camera in embodiment of this invention. 6 is a flowchart illustrating an example of a shooting operation processing procedure of the image processing apparatus according to the embodiment of the present invention. 6 is a flowchart illustrating an example of a shooting operation processing procedure of the image processing apparatus according to the embodiment of the present invention. 6 is a flowchart illustrating an example of a shooting operation processing procedure of the image processing apparatus according to the embodiment of the present invention. It is a flowchart which shows an example of the ranging / photometry processing procedure in step S114 of FIG. It is a flowchart which shows an example of the imaging | photography process procedure in step S128 of FIG. It is a flowchart which shows an example of the crack correction process procedure in step S129 of FIG. It is a flowchart which shows an example of the defect correction data read-out process procedure in step S401 of FIG. It is a figure which shows the breadth of the pixel range of a defect according to accumulation | storage time. It is a figure which shows the setting of the flaw correction range in step S514 of FIG.

Explanation of symbols

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

Claims (6)

An image sensor composed of a plurality of pixels;
Storage means for storing address information of defective pixels of the image sensor;
Defective pixel correction means for correcting a signal output from a pixel in a correction range set around the pixel corresponding to the address information;
The correction range is expanded as the accumulation time of the image sensor becomes longer, and the correction range is fixed when the accumulation time of the image sensor is equal to or longer than a predetermined time, or when the correction range reaches a predetermined range. Control means for controlling;
An imaging device comprising: An image sensor composed of a plurality of pixels;
Storage means for storing address information of defective pixels of the image sensor;
Defective pixel correction means for correcting a signal output from a pixel in a correction range set around the pixel corresponding to the address information;
Control means for expanding the correction range as the shutter speed becomes slower and controlling the correction range to be fixed when the shutter speed is equal to or higher than a predetermined speed, or when the correction range reaches a predetermined range;
An imaging device comprising: An image sensor composed of a plurality of pixels;
Storage means for storing address information of defective pixels of the image sensor;
Defective pixel correction means for correcting a signal output from a pixel in a correction range set around the pixel corresponding to the address information;
The setting of the correction range is changed according to the shooting conditions, and when the correction range exceeds a predetermined range , accumulation is performed in the dark for the same time as the accumulation time of the image sensor, and the image sensor accumulated in the dark is stored. Control means for controlling to perform subtraction processing at the output;
An imaging device comprising: A step of reading out address information of defective pixels of an image sensor composed of a plurality of pixels from a storage means;
A defective pixel correction step of correcting a signal output from a pixel in a correction range set around the pixel corresponding to the address information;
The correction range is expanded as the accumulation time of the image sensor becomes longer, and the correction range is fixed when the accumulation time of the image sensor is equal to or longer than a predetermined time, or when the correction range reaches a predetermined range. A control process to control;
A method for correcting image data, comprising: A step of reading out address information of defective pixels of an image sensor composed of a plurality of pixels from a storage means;
A defective pixel correction step of correcting a signal output from a pixel in a correction range set around the pixel corresponding to the address information;
A control step of expanding the correction range as the shutter speed becomes slower and controlling the correction range to be fixed when the shutter speed is equal to or higher than a predetermined speed, or when the correction range reaches a predetermined range;
A method for correcting image data, comprising: A step of reading out address information of defective pixels of an image sensor composed of a plurality of pixels from a storage means;
A defective pixel correction step of correcting a signal output from a pixel in a correction range set around the pixel corresponding to the address information;
The setting of the correction range is changed according to the shooting conditions, and when the correction range exceeds a predetermined range , accumulation is performed in the dark for the same time as the accumulation time of the image sensor, and the image sensor accumulated in the dark is stored. A control process for controlling to perform a subtraction process at the output;
A method for correcting image data, comprising:

Images