JP2008147956A - Unit and method for video signal processing, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive video signal processing unit preventing the display of a discontinuous image during optical zooming. <P>SOLUTION: The video signal processing unit includes an on/off decision means for deciding a release button to be on or off, and a completion decision means for deciding whether or not field processing is completed when the release button is decided to be off. Further, the video signal processing unit includes a position variation decision means for deciding the presence or absence of a zoom position change when the completion of field processing is decided, and a first setting means for setting a coefficient gain and a shading coefficient corresponding to the zoom position when the zoom position change is decided. Further, when the release button is decided to be on, the video signal processing unit includes a second setting means for setting the shading coefficient corresponding to the zoom position when a shutter is closed after the exposure of the image concerned. A system control circuit 90 has the function of each means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video signal processing apparatus and method, a program, and a recording medium, and more particularly to a video signal processing apparatus and method, such as an electronic still camera or a video camera, and a program and a recording medium.

  In general, in an image pickup apparatus having a lens system and an image pickup device, image quality deterioration occurs in an image to be picked up due to, for example, a decrease in peripheral light amount due to the lens system. For such a decrease in the amount of peripheral light, for example, a lens system may be designed with a large number of lenses to reduce the degree of light loss, but such a lens system designed with a large number of lenses becomes expensive. Tend to.

  On the other hand, for example, when a signal is extracted according to XY coordinates as in a device using a semiconductor image sensor, an image can be corrected by digital processing on the extracted video signal.

  Therefore, conventionally, for example, a technique for digitally correcting lens shading such as distortion caused by imaging with an inexpensive lens system, peripheral light loss, and color blurring has been proposed.

  For example, Patent Document 1 proposes the following technique.

  In general, since lens shading is considered to be a function of the distance from the lens optical axis to the correction pixel, d = √ (X ^ 2 + Y ^ 2) using the so-called Pythagorean theorem, the correction pixel from the lens optical axis. The distance d to is calculated. Then, a correction is performed by applying a shading coefficient, which is a function of the distance from the lens system optical axis to the correction pixel, to each correction pixel.

A compact electronic still camera that digitally corrects a decrease in the amount of light in the periphery of a lens system using the above-described technology has become widespread. In such a camera, the degree of peripheral light loss changes depending on the magnification of the optical zoom, so the shading correction coefficient is switched for each optical zoom magnification used for shooting (or whether shading correction is applied or not). Is common.
JP 2004-266750 A

  However, as described above, when the shading coefficient is switched for each photographing optical magnification, an unnatural image is displayed for the following reason. That is, when the optical zoom is continuously operated while framing with the electronic viewfinder, the image of the switching of the shading coefficient (or the switching of whether to apply shading correction) is discontinuous for a moment. In the case of a moving image, since the recorded moving image is discontinuous for a moment, an unnatural moving image is recorded.

  Also, as in Document 1, if each pixel in the radial direction has a shading coefficient, the data size of the shading coefficient increases, and the flash ROM and memory increase, thus increasing the cost.

  An object of the present invention is to provide a video signal processing apparatus and method, a program, and a recording medium that are inexpensive and do not display discontinuous images during optical zoom.

  In order to achieve the above object, the video signal processing apparatus according to claim 1, wherein the release button is turned off by the on / off judgment means for judging whether the release button is on or off, and the on / off judgment means. An end determination means for determining whether or not the field processing is completed if it is determined, and a position change determination means for determining whether or not the zoom position has changed if the end determination means determines that the field processing is ended. When the position variation determining means determines that the zoom position has changed, a first setting means for setting a coefficient gain and a shading coefficient corresponding to the zoom position, and the release button by the on / off determining means. If it is determined that the shutter is closed after the main image exposure, the shading coefficient corresponding to the zoom position is set. Characterized in that it comprises a second setting means for constant.

  The video signal processing apparatus according to claim 2, wherein the field processing ends when the release button is judged to be off by the on / off judgment means for judging whether the release button is on or off, and the on / off judgment means. An end determination means for determining whether or not the field processing has been completed by the end determination means, a position change determination means for determining whether or not the zoom position has changed, and the position change determination means by the position change determination means. When it is determined that the zoom position has changed, when the release button is determined to be on by the first setting means for setting the distance gain and the shading coefficient corresponding to the zoom position and the on / off determination means A second setting means for setting a shading coefficient corresponding to the zoom position when the shutter is closed after the main image exposure; Characterized in that it obtain.

  4. The video signal processing method according to claim 3, wherein when the release button is determined to be off by the on / off determination step for determining whether the release button is on or off, and the on / off determination step, the field processing ends. An end determination step for determining whether or not the field processing has been ended by the end determination step, a position change determination step for determining whether or not the zoom position has changed, and the position change determination step. When it is determined that the zoom position has changed, when the release button is determined to be ON by the first setting step for setting the coefficient gain and the shading coefficient corresponding to the zoom position and the ON / OFF determination step When the shutter is closed after the main image exposure, shading corresponding to the zoom position Characterized in that it comprises a second setting step of setting a number.

  5. The video signal processing method according to claim 4, wherein when the release button is determined to be OFF by the ON / OFF determination step for determining whether the release button is ON or OFF, and the ON / OFF determination step, the field processing ends. An end determination step for determining whether or not the field processing has been ended by the end determination step, a position change determination step for determining whether or not the zoom position has changed, and the position change determination step. When it is determined that the zoom position has changed, when the release button is determined to be ON by the first setting step for setting the distance gain and the shading coefficient corresponding to the zoom position and the ON / OFF determination step When the shutter is closed after the main image exposure, shading corresponding to the zoom position Characterized in that it comprises a second setting step of setting a number.

  6. The video signal processing program according to claim 5, wherein when the release button is determined to be off by the on / off determination module for determining whether the release button is on or off, and the on / off determination module, the field processing ends. An end determination module that determines whether or not the field processing is ended by the end determination module, a position variation determination module that determines whether or not the zoom position has changed, and the position variation determination module When it is determined that the zoom position has changed, when the release button is determined to be ON by the first setting module for setting the coefficient gain and the shading coefficient corresponding to the zoom position and the ON / OFF determination module When the shutter is closed after this image exposure, Characterized in that to execute a second setting module for setting a response to shading coefficient computer.

  7. The video signal processing program according to claim 6, wherein when the release button is determined to be off by the on / off determination module for determining whether the release button is on or off, and the on / off determination module, the field processing ends. An end determination module that determines whether or not the field processing is ended by the end determination module, a position variation determination module that determines whether or not the zoom position has changed, and the position variation determination module When it is determined that the zoom position has changed, when the release button is determined to be on by the first setting module for setting the distance gain and the shading coefficient corresponding to the zoom position and the on / off determination module When the shutter is closed after this image exposure, Characterized in that to execute a second setting module for setting a response to shading coefficient computer.

  A computer-readable recording medium according to a seventh aspect stores the video signal processing program according to the fifth aspect.

  A computer-readable recording medium according to an eighth aspect stores the video signal processing program according to the sixth aspect.

  The video signal processing apparatus according to claim 9, a lens that forms a desired subject image, a zoom control unit that controls a zoom magnification of the lens, a zoom magnification detection unit that detects a zoom magnification of the lens, and a subject An image sensor that forms an image and outputs a video signal corresponding to the image, an image sensor control unit that controls the image sensor, and correction data that corrects the signal level of the video signal obtained from the image sensor, Storage means for storing a plurality of sets corresponding to the zoom magnification obtained by the zoom magnification detection means, and correction data corresponding to the zoom magnification obtained by the zoom magnification detection means is read from the storage means and obtained zoom magnification Correction data processing means for performing correction to correct the correction data in accordance with the output data from the image sensor based on the output data of the correction data processing means Correction means for correcting the signal level of the video signal to be obtained, and the correction data processing means smoothly switches the correction data according to the zoom magnification obtained by the zoom magnification detection means and applies the correction data to the correction means, A video signal corresponding to a desired subject is corrected.

  The video signal processing apparatus according to claim 12, a lens that forms a desired subject image, an imaging element that forms the subject image and outputs a video signal corresponding to the image, and an imaging that controls the imaging element An element control unit, a storage unit for storing correction data for correcting the luminance level of the video signal obtained from the image sensor, and a correction for reading the correction data from the storage unit and performing an interpolation operation using the nearby correction data A data interpolating unit, a region selecting unit for selecting a specific region of the video signal, and a luminance unevenness correcting unit for correcting the luminance level of the video signal obtained from the image sensor based on the correction data; The luminance unevenness is corrected only in the region selected by the region selecting means of the video signal according to the above.

  The video signal processing apparatus according to the present invention includes an on / off judging means for judging whether the release button is on or off, and an end judging means for judging whether or not the field processing is finished when the release button is judged to be off. Prepare. Further, when it is determined that the field processing has been completed, a position variation determination unit that determines whether or not the zoom position has changed, and when it is determined that the zoom position has changed, a coefficient gain and a shading coefficient corresponding to the zoom position First setting means for setting. In addition, when it is determined that the release button is on, there is provided second setting means for setting a shading coefficient corresponding to the zoom position when the shutter is closed after the main image exposure.

  As a result, discontinuous images are not displayed during optical zoom while being inexpensive.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic block diagram of a video signal processing apparatus according to an embodiment of the present invention.

  In FIG. 1, the configuration of the video signal processing apparatus 100 will be described together with its functions and operations.

  The imaging lens 10 optically forms a captured image. The shutter 11 adjusts the exposure of the captured image. The image sensor 12 converts the captured image into an analog electrical signal. The A / D converter 14 converts the analog signal output of the image sensor 12 into a digital signal. Here, the digital data output from the A / D converter 14 is hereinafter referred to as CCD-RAW data.

  The display image data written in the memory 40 is converted from digital data to analog data via the D / A converter 16 and displayed by the image display unit 18. Further, an electronic viewfinder (EVF) function is realized by continuously reading out video signals from the image sensor 12 and displaying them on the image display unit 18.

  Recorded image data or the like is recorded on a recording medium 20 such as a memory card or a hard disk. The image processing circuit 30 performs development processing and resizing processing such as WB correction processing, predetermined pixel interpolation processing, and color conversion processing on CCD-RAW data that has been shot or recorded.

  The memory 40 expands the data in the ROM 96 and temporarily stores captured image data, and has a recording capacity sufficient to store a predetermined number of still images and a predetermined time of moving images. Yes.

  For example, CCD-RAW data output from the A / D converter 14 is written into the memory 40 via the memory control circuit 50, the image processing circuit 30, the JPEG circuit 60, or directly via the memory control circuit 50.

  The memory control circuit 50 includes an A / D converter 14, a D / A converter 16, a recording medium 20, an image processing circuit 30, a memory 40, a JPEG circuit 60, an OB detection circuit 70, an OB correction circuit 72, and a shading correction circuit 74. , The data flow to the WB detection circuit 78 is controlled.

  The JPEG circuit 60 compresses / decompresses image data by the baseline JPEG method. The OB detection circuit 70 detects the OB level. Depending on the color filter arrangement of the image sensor 12, for example, the OB level is detected by integrating the video signal for each color of R / G / B.

  The OB correction circuit 72 clamps the OB level of the OB detection circuit 70 from the video signal and corrects the OB level difference. The shading correction circuit 74 multiplies the video signal by a shading correction coefficient corresponding to the distance from the optical center.

  In addition, the video signal processing apparatus of the present invention is not limited to this. For example, the video signal processing apparatus may multiply a shading correction coefficient according to a horizontal coordinate or a shading correction coefficient according to a vertical coordinate, or according to a two-dimensional coordinate. The shading correction coefficient may be multiplied.

  In the shading correction circuit 74, the coefficient processing circuit 75 generates a shading coefficient. The multiplier 76 is for shading calculation.

  Circuit 78 detects WB. The zoom position detector 80 detects the position of the lens 10. It is.

  The system control circuit 90 controls the operation of the entire video signal processing apparatus 100 and each circuit constituting the video signal processing apparatus 100 according to the setting by the operation unit 92 and according to the contents stored in the ROM 96 (read-only memory). .

  For example, the operation unit 92 can switch and set each function mode such as power-off, shooting mode, and playback mode.

  The ROM 96 stores in advance programs used by the system control circuit 90, shading correction coefficients used by the shading correction circuit 74 (at least the number of zoom stop positions at which shading correction is performed is prepared), and the like. Yes.

  FIG. 2 is a block diagram showing a first embodiment of the shading correction circuit in FIG.

  2, the count processing circuit 75 includes an XY counter 200, a distance square calculation circuit 202, a square root circuit 204, a coefficient data interpolation circuit 208, a multiplier 210, and a coefficient selector 214.

  The XY counter 200 counts the number of pixels of the input CCD-RAW data. The distance square calculation circuit 202 calculates the distance square R ^ 2 = (X−X0) ^ from the center to the processing pixel from the XY count value (X, Y) and center coordinates (X0, Y0) of the pixel being processed. 2+ (Y−Y0) ^ 2 is calculated.

  The coefficient data interpolation circuit 208 reads out the corresponding coefficient data based on the distance R from the center of the processing pixel, and calculates the coefficient data by interpolation. Multiplier 210 multiplies coefficient data by a gain. The XY comparator 212 selects a rectangular area with reference to the XY count value.

  In the present embodiment, the square root circuit 204 may be omitted and the coefficient data may be read based on the square of the distance. Instead of the coefficient selector 214, the gain multiplication data and the through data are output to the output of the shading correction circuit 74. This selector may be provided.

  FIG. 3 is a characteristic diagram showing the output of the multiplier in FIG. 2, and FIG. 4 is a diagram for explaining the application range of shading correction by the shading correction circuit in FIG.

  Hereinafter, the operation of the coefficient processing circuit 75 will be described with reference to FIGS. 3 and 4. In this example, it is assumed that an image as shown in FIG. 4 is processed, and shading correction is performed only inside the dotted rectangle.

  FIG. 3 shows the output of the multiplier 210. The horizontal axis is the distance R from the center, and the vertical axis is the shading coefficient. In the broken line, where there is a symbol, coefficient data corresponding to the distance R is actually stored in the memory 40, and points between them are calculated by interpolation, for example, linear interpolation is performed from coefficient data on both sides. To do. The coefficient gain is set by the system control circuit 90 (in this embodiment, the coefficient gain is 1 or less, but may be 1 or more).

  A polygonal line with a coefficient gain of 1 indicates a shading correction coefficient at the zoom stop position, and is read from the memory 40. A broken line with a coefficient gain other than 1 indicates a shading correction coefficient during zoom movement, and the shading correction coefficient read from the memory 40 is multiplied by a coefficient gain corresponding to the zoom position during movement.

  FIG. 4 is a diagram for specifically explaining the application range of the CCD-RAW data to be processed and the shading coefficient. The gray area in the figure indicates the OB area.

  In order to multiply the shading coefficient only inside the dotted rectangle in the figure, the output of the multiplier 210 is selected by the coefficient selector 214 inside the dotted rectangle, and the fixed value gain 1 is selected otherwise. A select signal is output from.

  That is, the XY comparator 212 performs control so that the coefficient selector 214 outputs 1 when X ≧ 2 and X <26, and Y ≧ 3 and Y <21, and otherwise outputs a multiplier. Control to output 210 outputs.

  Also, (1) and (2) in the figure show cross sections of the shading coefficient in the horizontal and vertical directions.

  FIG. 5 is a flowchart showing a first procedure of photographing operation processing executed by the video signal processing apparatus of FIG.

  This process is executed by the system control circuit 90 in FIG.

  In FIG. 5, first, when EVF is activated, EVF display is started on the image display unit 18 after initialization such as setting of each processing circuit (step S501). During the EVF operation, the user is instructed by the operation unit 92 to end the photographing operation (step S502) and turn on the release button (step S503) (on / off determination means).

  When the processing of the captured image is completed for one field (YES in step S504) (end determination means), it is determined from the zoom position information of the zoom position detector 80 whether or not the zoom position has changed with respect to the previous field ( Step S505) (position variation determining means).

  If it has changed, the coefficient gain and the zoom stop position shading coefficient are reset (step S506. If the zoom position is at the zoom stop position, the coefficient gain is 1) (first setting means). Thereafter, the EVF restart is performed to display the next field (step S507).

  If the release button is turned on during the EVF operation (YES in step S503), each processing circuit is reset for the main image capture (step S508), and exposure of the main image starts (step S509).

  When the exposure is completed, the shutter is closed (step S510), a shading correction coefficient corresponding to the zoom stop position is set (step S511) (second determination means), and shading is performed on the CCD-RAW data read from the sensor. Correction is performed (step S512).

  If the user notifies the end of shooting during the EVF operation via the operation unit 92 (YES in step S502), the process ends.

  In the present embodiment, EVF has been described. However, the same processing can be applied to shading correction when a moving image is recorded.

  In this embodiment, the case where the subject is framed by EVF is shown. However, the present invention is not limited to this, and the subject may be framed by an optical viewfinder (OVF).

  FIG. 6 is a block diagram showing a second embodiment of the shading correction circuit in FIG.

  In FIG. 6, the coefficient processing circuit 75 of the shading correction circuit 74 according to the second embodiment includes a multiplier 306 that multiplies the distance from the center by a gain between the square root circuit 204 and the coefficient data interpolation circuit 208. Further, the multiplier 210 in FIG. 2 is not provided. Other configurations are the same as those of the coefficient processing circuit 75 of the shading correction circuit 74 of the second embodiment of FIG.

  Hereinafter, the operation of the coefficient processing circuit 75 will be described with reference to FIGS. 4 and 7. In this example, it is assumed that an image as shown in FIG. 4 is processed, and shading correction is performed only inside the dotted rectangle.

  FIG. 7 is a characteristic diagram showing the output of the multiplier in FIG.

  In FIG. 7, the horizontal axis represents the distance R from the center, and the vertical axis represents the shading coefficient. In the broken line, where there is a symbol, coefficient data corresponding to the distance R is actually stored in the memory 40, and points between them are calculated by interpolation, for example, linear interpolation is performed from coefficient data on both sides. To do. The coefficient gain is set by the system control circuit 90.

  A polygonal line with a coefficient gain of 1 indicates a shading correction coefficient at the zoom stop position, and is read from the memory 40. A broken line with a coefficient gain other than 1 indicates a shading correction coefficient during zoom movement, and the shading correction coefficient read from the memory 40 is multiplied by a coefficient gain corresponding to the zoom position during movement.

  In this embodiment, the zoom has a wide-side shading coefficient, and a large distance gain is applied each time the telephoto side moves, thereby realizing shading correction during zooming.

  However, the present invention is not limited to this, and shading correction during zooming may be realized by having a shading coefficient on the telephoto side of zooming and applying a small distance gain each time the zooming unit moves to the wide side.

  The application range of the processed CCD-RAW data and the shading coefficient in the present embodiment is the same as in FIG.

  FIG. 8 is a flowchart showing a second procedure of the photographing operation process executed by the video signal processing apparatus of FIG.

  This process is executed by the system control circuit 90 in FIG.

  In FIG. 8, first, when the EVF is activated, EVF display is started on the image display unit 18 after initialization such as setting of each processing circuit (step S801). During the EVF operation, the operation unit 92 instructs the user to finish the shooting operation (step S802) or turn on the release button (step S803).

  When the processing of the captured image is completed for one field (YES in step S804), it is determined from the zoom position information of the zoom position detector 80 whether or not the zoom position has changed with respect to the previous field (step S805).

  If so, the distance gain and the zoom stop position shading coefficient are reset (step S806. If the zoom position is at the zoom stop position, the distance gain is 1). Thereafter, the EVF restart is performed to display the next field (step S807).

  When the release button is turned on during the EVF operation (YES in step S803), each processing circuit is reset for the main image capture (step S808), and exposure of the main image starts (step S809).

  When exposure is completed, the shutter is closed (step S810), a shading correction coefficient corresponding to the zoom stop position is set (step S811), and shading correction is performed on the CCD-RAW data read from the sensor (step S811). S812).

  If the user notifies the end of shooting during the EVF operation via the operation unit 92 (YES in step S802), the process ends.

  In the present embodiment, EVF has been described. However, the same processing can be applied to shading correction when a moving image is recorded.

  In this embodiment, the case where the subject is framed by EVF is shown. However, the present invention is not limited to this, and the subject may be framed by an optical viewfinder (OVF).

  According to the present invention, since the shading coefficient between the photographing optical zoom magnifications is gently changed, continuous and natural display and moving image recording can be realized even if the optical zoom is operated during electronic viewfinder display or moving image recording. Can do.

  According to the present invention, since the shading coefficient between the photographic optical zoom magnifications is generated by multiplying the shading coefficient at the photographic optical zoom magnification by the gain, the capacity of the flash and the ROM can be reduced. Further, when generating the shading coefficient corresponding to the zoom magnification, the density of the number of shading coefficients existing per unit distance in the radial direction does not change, so that the shading coefficient can be finely applied to the distance from the optical center. .

  Further, according to the present invention, since the shading coefficient between the photographing optical zoom magnifications is generated from the shading coefficient at the photographing optical zoom magnification, the capacity of the flash ROM can be reduced. In addition, since an image at a distance close to the optical center by the optical zoom moves to the outside of the screen, a shading coefficient curve between the photographing optical zoom magnifications with respect to the distance from the optical center can be generated more faithfully.

  In addition, according to the present invention, shading coefficients are provided at coarse intervals for each of a plurality of pixels in the radial direction, and the shading coefficients of the pixels in the radial direction are calculated by interpolation. Can do. The drop in the amount of light around the lens continuously changes in the radial direction from the optical center, so there is no problem in image quality.

  Further, according to the present invention, since the application of shading correction is switched based on the rectangular window signal, even if the correction data interval is coarse, the boundary between the region where shading correction is desired and the other region can be switched at a fine interval. it can. As a result, there is no overcorrection of a region that is not desired to be shaded.

  In addition, according to the present invention, since the area other than the effective area of the image sensor is not corrected, an image quality defect (black sink etc.) of the effective area image due to the overcorrection of the OB area does not occur.

  The object of the present invention is achieved by executing the following processing. That is, a storage medium that records a program code of software that realizes the functions of the above-described embodiments is supplied to a system or apparatus, and a computer (or CPU or MPU) of the system or apparatus is stored in the storage medium. This is the process of reading the code.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code and the storage medium storing the program code constitute the present invention.

  Moreover, the following can be used as a storage medium for supplying the program code. For example, floppy (registered trademark) disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, nonvolatile memory card, ROM or the like. Alternatively, the program code may be downloaded via a network.

  Further, the present invention includes a case where the function of the above-described embodiment is realized by executing the program code read by the computer. In addition, based on the instruction of the program code, the O step S (operating system) running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing. This is also included.

  Furthermore, a case where the functions of the above-described embodiment are realized by the following processing is also included in the present invention. That is, the program code read from the storage 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. Thereafter, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

1 is a schematic block diagram of a video signal processing apparatus according to an embodiment of the present invention. It is a block diagram which shows 1st Embodiment of the shading correction circuit in FIG. FIG. 3 is a characteristic diagram showing an output of a multiplier in FIG. 2. It is a figure for demonstrating the application range of the shading correction by the shading correction circuit in FIG. 3 is a flowchart showing a first procedure of photographing operation processing executed by the video signal processing apparatus of FIG. 1. It is a block diagram which shows 2nd Embodiment of the shading correction circuit in FIG. It is a characteristic view which shows the output of the multiplier in FIG. 6 is a flowchart showing a second procedure of photographing operation processing executed by the video signal processing device of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shooting lens 11 Shutter 12 Image pick-up element 14 A / D converter 16 D / A converter 18 Image display part 20 Recording medium 30 Image processing circuit 40 Memory 50 Memory control circuit 60 JPEG circuit 70 OB detection circuit 72 OB correction circuit 74 Shading Correction circuit 75 Coefficient processing circuit 76 Multiplier 78 WB detection circuit 80 Zoom position detection unit 90 System control circuit 92 Operation unit 96 Memory (ROM)

Claims (14)

An on / off judging means for judging whether the release button is on or off;
An end determination means for determining whether or not the field processing is ended when the on / off determination means determines that the release button is off;
Position variation determining means for determining whether or not the zoom position has changed when it is determined by the end determining means that the field processing has ended;
A first setting unit that sets a coefficient gain and a shading coefficient corresponding to the zoom position when the position variation determination unit determines that the zoom position has changed;
A second setting means for setting a shading coefficient corresponding to the zoom position when the shutter is closed after the main image exposure when the on / off determination means determines that the release button is on;
A video signal processing apparatus comprising: An on / off judging means for judging whether the release button is on or off;
An end determination means for determining whether or not the field processing is ended when the on / off determination means determines that the release button is off;
Position variation determining means for determining whether or not the zoom position has changed when it is determined by the end determining means that the field processing has ended;
A first setting unit configured to set a distance gain and a shading coefficient corresponding to the zoom position when the position variation determination unit determines that the zoom position has changed;
A second setting means for setting a shading coefficient corresponding to a zoom position when the shutter button is closed after exposure of the main image when the on / off determination means determines that the release button is on;
A video signal processing apparatus comprising: An on / off judgment step for judging whether the release button is on or off;
An end determination step for determining whether or not the field processing is ended when it is determined in the on / off determination step that the release button is off;
A position variation determination step for determining whether or not the zoom position has changed when it is determined in the end determination step that the field processing has ended;
A first setting step for setting a coefficient gain and a shading coefficient corresponding to the zoom position when it is determined that the zoom position has changed in the position change determination step;
A second setting step for setting a shading coefficient corresponding to a zoom position when the shutter is closed after the exposure of the main image when the release button is determined to be ON by the ON / OFF determination step;
A video signal processing method comprising: An on / off judgment step for judging whether the release button is on or off;
An end determination step for determining whether or not the field processing is ended when it is determined in the on / off determination step that the release button is off;
A position variation determination step for determining whether or not the zoom position has changed when it is determined in the end determination step that the field processing has ended;
A first setting step of setting a distance gain and a shading coefficient corresponding to the zoom position when it is determined that the zoom position has changed in the position change determination step;
A second setting step for setting a shading coefficient corresponding to a zoom position when the shutter is closed after the exposure of the main image when the release button is determined to be ON by the ON / OFF determination step;
A video signal processing method comprising: An on / off determination module for determining whether the release button is on or off;
An end determination module that determines whether or not the field processing is ended when the on / off determination module determines that the release button is off;
A position variation determination module that determines whether or not the zoom position has changed when it is determined by the end determination module that the field processing has ended;
A first setting module that sets a coefficient gain and a shading coefficient corresponding to the zoom position when the position change determination module determines that the zoom position has changed;
A second setting module that sets a shading coefficient corresponding to a zoom position when the shutter is closed after the main image exposure when the on / off determination module determines that the release button is on;
A video signal processing program for causing a computer to execute the above. An on / off determination module for determining whether the release button is on or off;
An end determination module for determining whether or not the field processing is ended when the on / off determination module determines that the release button is off;
A position variation determination module that determines whether or not the zoom position has changed when it is determined by the end determination module that the field processing has ended;
A first setting module that sets a distance gain and a shading coefficient corresponding to the zoom position when the position change determination module determines that the zoom position has changed;
A second setting module that sets a shading coefficient corresponding to a zoom position when the shutter is closed after the main image exposure when the on / off determination module determines that the release button is on;
A video signal processing program for causing a computer to execute the above.   A computer-readable recording medium storing the video signal processing program according to claim 5.   A computer-readable recording medium storing the video signal processing program according to claim 6. A lens that forms a desired subject image;
Zoom control means for controlling the zoom magnification of the lens;
Zoom magnification detecting means for detecting the zoom magnification of the lens;
An image sensor that forms a subject image and outputs a video signal corresponding to the image;
Image sensor control means for controlling the image sensor;
Storage means for storing a plurality of sets of correction data for correcting the signal level of the video signal obtained from the image sensor in correspondence with the zoom magnification obtained by the zoom magnification detection means;
Correction data processing means for reading out correction data corresponding to the zoom magnification obtained by the zoom magnification detection means from the storage means, and performing a calculation for correcting the correction data according to the obtained zoom magnification;
Correction means for correcting the signal level of the video signal obtained from the image sensor based on the output data of the correction data processing means,
The correction data processing unit smoothly switches correction data according to the zoom magnification obtained by the zoom magnification detection unit and applies the correction data to the correction unit to correct a video signal corresponding to a desired subject. Video signal processing device.   10. The video signal processing apparatus according to claim 9, wherein the correction data processing unit multiplies the correction data by a gain corresponding to the zoom magnification detected by the zoom magnification detection unit.   The correction data processing unit multiplies the distance from the optical center of the subject image by a gain according to the zoom magnification detected by the zoom magnification detection unit, and corrects the correction data that is close to the optical center far from the optical center. The video signal processing apparatus according to claim 9, wherein the video signal processing apparatus is applied to an image or correction data having a long distance from the optical center is applied to an image close to the optical center. A lens that forms a desired subject image;
An image sensor that forms a subject image and outputs a video signal corresponding to the image;
Image sensor control means for controlling the image sensor;
Storage means for storing correction data for correcting the luminance level of the video signal obtained from the image sensor;
Correction data interpolating means for reading out correction data from the storage means, and performing interpolation calculation using correction data in the vicinity;
Area selection means for selecting a specific area of the video signal;
Brightness unevenness correcting means for correcting the brightness level of the video signal obtained from the image sensor based on the correction data;
A video signal processing apparatus that corrects luminance unevenness only in a region selected by the region selection unit of a video signal corresponding to a desired subject.   13. The video signal processing apparatus according to claim 12, wherein the correction data interpolation means is based on linear interpolation from a plurality of neighboring pixels.   The video signal processing apparatus according to claim 12, wherein the area selection unit selects an effective image area of the image sensor.

Images