JP2006013858A - Image processing apparatus and image processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processing apparatus for adjusting the brightness of a screen based on the information of black level correction which is performed by an electronic camera concerning ex-post image processing in a computer, etc. <P>SOLUTION: The image processing apparatus processes the photographed image of the electronic camera, including an imaging element provided with an effective pixel area and a lightproof area formed around the effective pixel area. The apparatus comprises a reader for reading photographed image data having image data which are generated based on the output of the effective pixel area and black level standard data which are generated based on the output of the lightproof area; a display unit for displaying a correspondence relation between the black level standard data and the image data; an input part for changing the black level standard data; and a correction processor for correcting the black level of the image data based on the black level standard data which are changed by the input part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image processing apparatus and an image processing program for processing a photographed image photographed by an electronic camera.

In recent years, electronic cameras that generate digital data (photographed image data) of a photographed image by photoelectrically converting a subject image using an image sensor have been rapidly spread. In general, various parameters of photographed image data are adjusted on a computer to create an image in accordance with the user's intention.
Here, Patent Document 1 discloses an image reproduction apparatus configured to deliver incidental information relating to photographing conditions such as date and time and photographing location to a computer in association with photographed image data when a digital image is reproduced on a computer. Yes.
JP 2000-66312 A

  By the way, the output of the image sensor of the electronic camera contains noise for the black level due to the dark current component, and the electronic camera detects the black level by shielding a part of the image sensor and detects the black level detected from the image level. Black level correction is performed by subtracting the level. Therefore, when adjusting the brightness of the image by processing the captured image data on the computer, if there is information on the black level correction performed by the electronic camera, it becomes a reference for adjusting the brightness of the image, and the correction range is also It becomes clear.

  However, conventionally, no information on black level correction is left in captured image data generated by an electronic camera, and when a user performs image processing on a computer, what kind of black level correction is performed from the image data. It was extremely difficult to judge whether or not Also in the above-mentioned Patent Document 1, the incidental information does not include information indicating the contents of image processing performed by the electronic camera. Therefore, the user is forced to repeat trial and error when adjusting the brightness of the image on the computer, and can sufficiently meet the user's request to adjust the fine brightness of the image data on the computer. The fact was not.

  The present invention is to solve the above-described problems of the prior art, and in the subsequent image processing using a computer or the like, the user adjusts the screen brightness based on the information of the black level correction performed by the electronic camera. An image processing apparatus capable of adjustment is provided.

  The invention according to claim 1 is an image processing apparatus for processing a captured image of an electronic camera having an imaging element having an effective pixel area and a light shielding area formed on an outer periphery of the effective pixel area, wherein the effective pixel area A reading unit that reads captured image data including image data generated based on the output of the image, and black level reference data generated based on the output of the light shielding area, the black level reference data, and the image data A display unit for displaying the correspondence relationship, an input unit for changing the black level reference data, and a correction process for correcting the black level of the image data based on the black level reference data changed by the input unit And a portion.

According to a second aspect of the present invention, in the first aspect of the invention, the display unit displays a current value and a changeable range of the black level reference data, and a reproduced image based on the image data. .
According to a third aspect of the present invention, in the first or second aspect of the present invention, the black level reference data includes a plurality of values, and the plurality of values are each processing unit obtained by dividing the image data in a horizontal direction or a vertical direction. When the black level reference data at a designated position arbitrarily selected from the processing unit is changed, the black level correction unit is configured to make the processing adjacent to the designated position in the horizontal direction or the vertical direction. The unit black level reference data is changed in conjunction with the change of the black level reference data at the designated position, and the change of the black level reference data from the designated position to the predetermined range is smoothly interpolated.

  According to a fourth aspect of the present invention, there is provided an image processing apparatus for processing an image captured by an electronic camera having an image pickup device having an effective pixel region and a light shielding region formed on an outer periphery of the effective pixel region, wherein the effective pixel region And a plurality of black data generated based on the output of the light shielding region and associated with each processing unit. A reading unit that reads captured image data including level reference data; a singularity determination unit that detects a singularity where the spatial change amount is equal to or greater than a threshold based on the spatial change amount of the black level reference data; And a correction processing unit that corrects the black level reference data corresponding to a singular point based on the amount of spatial change.

  The invention according to claim 5 is an image processing apparatus for processing a captured image of an electronic camera having an image pickup device having an effective pixel area and a light shielding area formed on an outer periphery of the effective pixel area, wherein the effective pixel area And a plurality of black data generated based on the output of the light shielding region and associated with each processing unit. A reading unit that reads captured image data including level reference data; a correction coefficient generation unit that generates a horizontal or vertical shading correction coefficient based on a spatial change amount of the black level reference data; and the correction coefficient And a correction processing unit that performs shading correction on the image data.

According to a sixth aspect of the present invention, in the first to fifth aspects of the present invention, the electronic camera further includes a clamp unit that performs black level correction of the image data, and the black level reference data is stored in the clamp unit. The data is used for black level correction.
According to a seventh aspect of the present invention, in the first to sixth aspects of the present invention, the recording unit further stores a correspondence relationship between the photographing condition of the electronic camera and the offset value of the black level reference data based on the photographing condition. And the correction processing unit acquires the offset value corresponding to the shooting condition from the recording unit based on the shooting condition of the electronic camera, and corrects the black level of the image data based on the offset value. It is characterized by doing.

  The invention according to claim 8 is an image processing program for processing an image captured by an electronic camera having an imaging element having an effective pixel area and a light shielding area formed on an outer periphery of the effective pixel area, wherein the effective pixel area A procedure for reading captured image data including image data generated based on the output of the image and black level reference data generated based on the output of the light-shielding region, and the black level reference data and the image data. The computer is caused to execute a procedure for displaying the correspondence relationship and a procedure for correcting the black level of the image data based on the black level reference data changed by an operator input.

  The invention according to claim 9 is an image processing program for processing an image captured by an electronic camera having an image sensor having an effective pixel area and a light-shielding area formed on an outer periphery of the effective pixel area, wherein the effective pixel area And a plurality of black data generated based on the output of the light shielding region and associated with each processing unit. Corresponding to the procedure for reading captured image data including level reference data, the procedure for detecting a singular point where the spatial change amount is equal to or greater than a threshold based on the spatial change amount of the black level reference data, and the singular point And correcting the black level reference data based on the amount of change.

  The invention according to claim 10 is an image processing program for processing an image captured by an electronic camera having an image pickup device having an effective pixel area and a light-shielding area formed on an outer periphery of the effective pixel area, wherein the effective pixel area And a plurality of black data generated based on the output of the light shielding region and associated with each processing unit. A procedure for reading captured image data including level reference data; a procedure for generating a shading correction coefficient in a horizontal direction or a vertical direction based on a spatial change amount of the black level reference data; and And causing the computer to execute a procedure for performing shading correction on the image data.

  In the present invention, the black level reference data relating to the black level correction performed by the electronic camera is displayed in association with the image data. And, since the user can adjust the screen brightness based on the information of the black level correction performed by the electronic camera, it is easy to perform a finer black level correction in the subsequent image processing using a computer or the like. Is possible. The effect is particularly remarkable when RAW data (raw data output from the image sensor) of an electronic camera is processed by software on a computer.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
(Description of the first embodiment)
FIG. 1 is a functional block diagram of the image processing apparatus of the first embodiment (corresponding to the image processing apparatus of claims 1 to 7 and the image processing program of claims 8 to 10). The present embodiment is an example in which an image processing apparatus is configured by causing a personal computer or the like to execute an image processing program.

  First, based on FIG. 2, the outline | summary of the picked-up image data used as the object of this embodiment is demonstrated. The photographed image data is generated by an electronic camera and has image data and black level reference data. The image data is data generated based on the output of the effective pixel area of the image sensor of the electronic camera, and the subject image formed by the photographing optical system of the electronic camera is recorded. On the other hand, the black level reference data is data based on the output of a light shielding region (optical black region) formed adjacent to the outer periphery of the effective pixel region and having its surface covered with a light shielding film.

The output of the light-shielding region in the image sensor can be regarded as a portion where no subject light is incident, that is, data corresponding to black in the subject image. Therefore, the electronic camera corrects the black level of the image data using the output of the light shielding area.
In the example of FIG. 2, the clamp data used for the black level correction of each row in the horizontal direction by the electronic camera is recorded in the portion of the light-shielding region located on the right side of the image data (see FIG. 2B). At the end of each line of image data, clamp data used for correcting the line is recorded in association with each other. In the present embodiment, the above clamp data constitutes black level reference data in the horizontal direction. Depending on the electronic camera, it can be assumed that all lines are corrected with the same black level value, or that correction is made with the same black level value in units of multiple lines. The corresponding minutes are recorded.

  Next, the configuration of the image processing apparatus 1 of the present embodiment will be described. The image processing apparatus 1 includes a microprocessor 2, a memory 3, a bus interface unit 4, a display driver unit 5, a disk drive unit 6, and a system bus 7 that connects the units. The image processing apparatus 1 is connected to an input unit 8 such as a keyboard or a pointing device, and a monitor 9.

  The microprocessor 2 controls each part of the image processing apparatus 1 and executes an image processing program described later to correct the black level of the captured image data. In the memory 3, there is a correspondence relationship between shooting conditions (for example, characteristics of an image pickup device depending on a camera model, shooting time, exposure correction, and the like) and an offset value of black level reference data that changes according to a combination of the shooting conditions. It is stored as a table. Note that the offset value of the black level reference data may be a statistically obtained value in advance or may be data customized by the user.

The bus interface unit 4 controls data transmission / reception with peripheral devices connected to the image processing apparatus 1 in accordance with a serial communication standard such as USB (Universal Serial Bus) or IEEE1394. The display driver unit 5 outputs an image to the monitor 9. The disk drive unit 6 reads / writes data from / to the magneto-optical recording medium.
The image processing apparatus 1 of the first embodiment is configured as described above, and the operation of the image processing program of the present embodiment will be described below with reference to the flowchart of FIG.

Step S101: The microprocessor 2 takes a photographed image from a recording medium connected to the bus interface unit 4 (or an electronic camera itself connected to the bus interface unit 4), a magneto-optical recording medium inserted into the disk drive unit 6, and the like. Read data.
Step S102: The microprocessor 2 outputs a display relating to the image data and the black level reference data to the monitor 9. As shown in FIG. 4, a reproduced image 10 of the image data is displayed at the center on the monitor 9. A display area 11 for displaying the current value of the black level value based on the black level reference data is displayed on the left side of the reproduced image 10 on the monitor 9. In the display area 11, black level values corresponding to the horizontal rows of the image data are displayed.

  In the display area 11 on the monitor 9, the upper limit “H” and lower limit “L” (changeable range) of the black level value and the current value of the black level value for each line are displayed. As shown in FIG. 4, the change in the black level value in the vertical direction of the screen is displayed in a graph in the display area 11. Further, a pointer 12 for designating any one of the lines is displayed in the display area 11, and the pointer 12 can be moved in each display area by an input from the input means 8 (note that FIG. In FIG. 4, a designated line is virtually indicated by a one-dot chain line). A black level value corresponding to the line designated by the pointer 12 is displayed near the display area of the monitor 9.

Therefore, the user confirms the black level value based on the image data (reproduced image) of the photographed image data and the clamp data on the reproduced image 10 and the display area 11 on the monitor 9, and the changeable range of the black level value of the image data It is possible to clearly grasp the change in the black level value in the vertical direction of the screen and determine whether correction is necessary.
Step S103: The microprocessor 2 determines whether or not the user ends the operation of changing the reproduced and displayed image data (for example, whether there is an instruction to read another captured image data or an instruction to end the image processing program). . When the user ends the change operation (YES side), the microprocessor 2 ends the process for the current captured image data. At this time, the captured image data may be stored in an arbitrary recording medium. On the other hand, when the user does not end the change operation (NO side), the microprocessor 2 proceeds to step S104.

Step S104: The microprocessor 2 determines whether or not the auto correction mode is OFF. If the auto correction mode is OFF (YES side), the microprocessor 2 proceeds to step S105. On the other hand, when the auto correction mode is ON (NO side), the microprocessor 2 proceeds to step S106.
Step S105: In this case, the microprocessor 2 corrects the black level of the image data based on the user input. The user operates the pointer 12 of the display area 11 with the input means 8 to designate a line for changing the black level value. Next, the user changes the black level value of the designated line by sliding the pointer 12 left and right in the designated line or by directly inputting the numerical value of the black level value.

  For example, the case where the representation range of the image data is 12 bits (0 to 4095 LSB: the thinner the numerical value, the thinner) will be described. When the black level value of the designated row is 200 LSB, the reproduced image has a gradation of 200 to 4095 LSB. It is expressed. When the user desires a lighter image, the black level value is increased, and when the user desires a darker image, the black level value is decreased. Then, the microprocessor 2 re-corrects the black level of the image data based on the difference between the black level values before and after the change, and updates the black level reference data in the specified row of the image data with the changed black level value data. .

Here, if only the black level of the line designated in the above correction is corrected, only the designated line corrected in the reproduced image may float from the surroundings. For this reason, the microprocessor 2 may perform black level correction in conjunction with black level correction of the designated row even for a predetermined range of rows that are close to each other above and below the designated row (see FIG. 5).
For example, the microprocessor 2 corrects, by adding to the current black level value a value obtained by multiplying the change amount of the black level value in the designated row by an interpolation coefficient for rows within a predetermined range from the designated row. Thereby, the change of the black level value from the designated line to the predetermined range becomes smooth. The interpolation coefficient is set to be greater than 0 and less than 1 and decrease as the distance from the designated row increases. In particular, it is preferable to set the interpolation coefficient so that the black level value from the designated line to the predetermined range changes in a curved line. For the calculation of the interpolation coefficient, for example, a known interpolation method such as spline interpolation can be applied.

After the black level correction is executed in step S105, the microprocessor 2 moves to step S102, and displays the reproduced image with the black level recorrected and the updated black level value on the monitor 9. Thereby, the user can determine the suitability of the black level correction.
Step S106: In this case, the microprocessor 2 selectively executes the following correction processes (1) to (3) according to user settings.

(1) Correction of dark transition phenomenon “Dark transition phenomenon” means that when a high brightness subject is located in the vicinity of a light shielding area used for black level correction, stray light enters the light shielding area near the high brightness subject and the signal level is increased. This is a phenomenon in which the black level corrected image sinks darkly in a streak shape (see FIG. 6). In this correction mode, the microprocessor 2 executes the following processing shown in FIG.

  First, the microprocessor 2 calculates the difference (spatial change amount) between the black level reference data of the adjacent rows above and below for each row (S201). Next, the microprocessor 2 detects a singular point where the calculated space change amount is equal to or greater than a threshold value (S202). The line with the singular point corresponds to the start point (or end point) of the dark phenomenon. Then, the microprocessor 2 corrects the black level value in the range corresponding to the singular point (the row where the dark phenomenon has occurred) based on the amount of spatial change in the singular point row, thereby correcting the black level of the image data ( S203). With the above-described operation, it is possible to alleviate the dark transition phenomenon of the captured image using the black level reference data in the post-processing step by the image processing apparatus, and it is possible to obtain a better captured image.

(2) Shading correction A local distortion (shading) in the amplitude is generated in the output of the image sensor of the electronic camera due to the sensitivity unevenness of the sensor, and this is corrected. In this correction mode, the microprocessor 2 executes the following processing shown in FIG.
First, the microprocessor 2 samples the black level value at regular intervals in the vertical direction, and calculates the difference (space change amount) between these black level reference data (S301). Next, the microprocessor 2 sets the black level value at an arbitrary sampling point as an offset amount (S302). The microprocessor 2 adds a value based on the spatial change amount of each row to the offset amount of S302, and calculates a shading correction coefficient for each row (S303). Then, the microprocessor 2 corrects the black level of the image data by subtracting the shading correction coefficient from the black level value for each row (S304). With the above operation, shading correction in the vertical direction of the screen can be performed using the black level reference data in the post-processing step by the image processing apparatus, and a better captured image can be obtained.

(3) Correction by Offset Value Based on Shooting Condition In this correction mode, the microprocessor 2 reads from the memory 3 based on the shooting condition setting (camera model, shooting time, exposure correction, etc.) specified in advance by the user. The offset value of the black level reference data is read, and the black level of the image data is corrected by the offset value. With the above-described operation, it is possible to easily perform different black level correction for each photographing condition in the post-processing step by the image processing apparatus, and it is possible to easily obtain a photographed image intended by the user.

  After the black level correction is executed in step S106, the microprocessor 2 moves to step S102, and displays the reproduced image with the black level recorrected and the updated black level value on the monitor 9. As a result, the user can determine whether black level correction is appropriate or not, and when correction is necessary, a photographed image intended by the user can be realized by manual correction in S105.

(Description of Second Embodiment)
FIG. 9 is a diagram showing an example of a display screen in the image processing program of the second embodiment (corresponding to the image processing apparatus of claims 1 to 7 and the image processing program of claims 8 to 10). The second embodiment is a modification of the first embodiment, in which black level correction using clamp data is performed for each horizontal row of image data, and light shielding region data is also used for each vertical column. This is an example of performing the correction processing. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and description is abbreviate | omitted.

The microprocessor 2 according to the second embodiment generates black level reference data corresponding to each column in the vertical direction from the raw data of the light shielding area located above or below the effective pixel area. A display area 11 for displaying the black level value in each column in the vertical direction of the image data is set above the reproduced image 10 of the monitor 9 shown in FIG.
In the second embodiment, the user can change the black level value of any column by operating the pointer 12 of the display area 11 for each column in the vertical direction, and can re-correct the black level of the image data. Note that the black level value corresponding to the vertical direction of the image data is overwritten and stored in a predetermined format in the unused portion in the data area corresponding to the light shielding area.

  In the second embodiment, since the black level value in the vertical direction of the image data can be changed, it is possible to correct shading correction in the left-right direction of the screen, and correction of blooming extending to the upper and lower ends of the screen. Here, “blooming” is a phenomenon in which when a high-brightness object is photographed with a CCD, electrons exceeding the saturation capacity of the pixel are generated, and electrons leak into adjacent pixels along the direction of the readout line of the CCD. (See FIG. 10).

  The blooming can be corrected by the microprocessor 2 in substantially the same process as that for correcting the dark phenomenon. That is, the microprocessor 2 calculates the difference (space change amount) between the black level reference data of the columns adjacent to the left and right for each column. Next, the microprocessor 2 detects a singular point where the calculated spatial change amount is equal to or greater than a threshold value. This column with singular points corresponds to the start point (or end point) of blooming. Then, the microprocessor 2 corrects the black level of the image data by changing the black level value of the range corresponding to the singular point (the column in which blooming has occurred) based on the amount of spatial change.

  Here, if the amount of spatial change of the singularity column is subtracted from the black level value as it is in the blooming correction, the correction portion sinks darkly in a high-luminance subject portion, resulting in an unnatural image ( FIG. 11). Therefore, in the blooming correction, the spatial change amount in the row of singular points is not used as a correction value as it is, but a value obtained by multiplying the spatial change amount by a predetermined coefficient (for example, a value of 50 to 80% of the spatial change amount). Is preferably used as the correction value.

By the above operation, blooming extending to the upper and lower ends of the screen in the post-processing step by the image processing apparatus is alleviated, and a better captured image can be obtained.
(Correspondence between Claims and Embodiments)
Here, the correspondence between the claims and the embodiment is shown. Note that the correspondence shown below is an interpretation given for reference only, and does not limit the technical scope of the present invention.

  The “reading unit” corresponds to the bus interface unit 4 and the disk drive unit 6. The “display unit” corresponds to the monitor 9. The input means 8 corresponds to the “input unit”. The microprocessor 2 corresponds to the “correction processing unit”, “singular point determination unit”, and “correction coefficient generation unit”. The “recording unit” corresponds to the memory 3. The program according to claims 8 to 10 is executed by the microprocessor 2.

(Supplementary items of the embodiment)
As mentioned above, although this invention has been demonstrated by said embodiment, the technical scope of this invention is not limited to the said embodiment. For example, the darkening phenomenon, shading correction, and blooming correction can be corrected by manual correction (S105) by the user.

  In the above-described embodiment, an example in which the image processing apparatus is realized on a computer has been described. However, for example, by causing the electronic camera to execute the program, the darkening phenomenon or blooming of an image after shooting is automatically performed on the electronic camera. Correction may be made. In this case, it is not always necessary to display the black level value outside.

  The present invention can be applied to an image processing apparatus and an image processing program for processing a captured image of an electronic camera.

Functional block diagram of the image processing apparatus of the first embodiment Overview of captured image data Flow chart showing the operation of the image processing program of the first embodiment The figure which shows an example of the display screen in the image processing program of 1st Embodiment Diagram illustrating interpolation of black level reference data from a specified line to a predetermined range Illustration of dark phenomenon Flow chart of dark phenomenon correction Shading correction flowchart The figure which shows an example of the display screen in the image processing program of 2nd Embodiment Illustration of blooming Explanatory diagram when blooming correction is performed by applying the spatial variation of the singularity column as it is

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image processing apparatus 2 Microprocessor 3 Memory 4 Bus interface part 5 Display driver part 6 Disk drive part 7 System bus 8 Input means 9 Monitor 10 Reproduction image 11 Black level value display area 12 Pointer

Claims (10)

An image processing apparatus for processing a captured image of an electronic camera having an imaging element having an effective pixel area and a light shielding area formed on an outer periphery of the effective pixel area,
A reading unit that reads captured image data including image data generated based on the output of the effective pixel region and black level reference data generated based on the output of the light shielding region;
A display unit for displaying a correspondence relationship between the black level reference data and the image data;
An input unit for changing the black level reference data;
A correction processing unit that corrects the black level of the image data based on the black level reference data changed in the input unit;
An image processing apparatus comprising:   The image processing apparatus according to claim 1, wherein the display unit displays a current value and a changeable range of the black level reference data, and a reproduced image based on the image data. The black level reference data includes a plurality of values, and the plurality of values are associated with each processing unit obtained by dividing the image data in the horizontal direction or the vertical direction,
In the case of changing the black level reference data at a designated position arbitrarily selected from the processing unit, the black level correction unit changes the black level reference data of the processing unit adjacent to the designated position in the horizontal direction or the vertical direction. 3. The change according to claim 1 or 2, wherein the change is performed in conjunction with the change in the black level reference data at the specified position, and the change in the black level reference data from the specified position to a predetermined range is smoothly interpolated. Image processing apparatus. An image processing apparatus for processing a captured image of an electronic camera having an imaging element having an effective pixel area and a light shielding area formed on an outer periphery of the effective pixel area,
Generated based on the output of the effective pixel region, divided into a plurality of processing units in the horizontal direction or the vertical direction, and generated based on the output of the light shielding region, and associated with each processing unit. A reading unit that reads captured image data including a plurality of black level reference data,
A singularity determination unit that detects a singularity where the spatial variation is equal to or greater than a threshold based on the spatial variation of the black level reference data;
A correction processing unit that corrects the black level reference data corresponding to the singular point based on the amount of spatial change;
An image processing apparatus comprising: An image processing apparatus for processing a captured image of an electronic camera having an imaging element having an effective pixel area and a light shielding area formed on an outer periphery of the effective pixel area,
Generated based on the output of the effective pixel region, divided into a plurality of processing units in the horizontal direction or the vertical direction, and generated based on the output of the light shielding region, and associated with each processing unit. A reading unit that reads captured image data including a plurality of black level reference data,
A correction coefficient generation unit that generates a horizontal or vertical shading correction coefficient based on a spatial change amount of the black level reference data;
A correction processing unit that performs shading correction on the image data using the correction coefficient;
An image processing apparatus comprising: The electronic camera further includes a clamp unit that performs black level correction of the image data,
6. The image processing apparatus according to claim 1, wherein the black level reference data is data used for black level correction in the clamp unit. A recording unit that stores a correspondence relationship between the photographing condition of the electronic camera and the offset value of the black level reference data based on the photographing condition;
The correction processing unit acquires the offset value corresponding to the shooting condition from the recording unit based on the shooting condition of the electronic camera, and corrects the black level of the image data based on the offset value. The image processing apparatus according to claim 1, wherein the image processing apparatus is characterized. An image processing program for processing a photographed image of an electronic camera having an image pickup device having an effective pixel region and a light shielding region formed on an outer periphery of the effective pixel region,
A procedure for reading captured image data including image data generated based on the output of the effective pixel region and black level reference data generated based on the output of the light shielding region;
A procedure for displaying a correspondence relationship between the black level reference data and the image data;
Correcting the black level of the image data based on the black level reference data changed by an operator's input;
An image processing program for causing a computer to execute. An image processing program for processing a photographed image of an electronic camera having an image pickup device having an effective pixel region and a light shielding region formed on an outer periphery of the effective pixel region,
Generated based on the output of the effective pixel region, divided into a plurality of processing units in the horizontal direction or the vertical direction, and generated based on the output of the light shielding region, and associated with each processing unit. A procedure for reading captured image data comprising a plurality of black level reference data,
A procedure for detecting a singular point where the spatial variation is equal to or greater than a threshold based on the spatial variation of the black level reference data;
Correcting the black level reference data corresponding to the singular point based on the amount of change;
An image processing program for causing a computer to execute. An image processing program for processing a photographed image of an electronic camera having an image pickup device having an effective pixel region and a light shielding region formed on an outer periphery of the effective pixel region,
Generated based on the output of the effective pixel region, divided into a plurality of processing units in the horizontal direction or the vertical direction, and generated based on the output of the light shielding region, and associated with each processing unit. A procedure for reading captured image data comprising a plurality of black level reference data,
Generating a horizontal or vertical shading correction coefficient based on the amount of spatial change of the black level reference data;
A procedure for performing shading correction on the image data using the correction coefficient;
An image processing program for causing a computer to execute.

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