JP2006042320A - Digital camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a digital camera having an image blur correction mechanism. <P>SOLUTION: A CCD is driven along with a surface vertical to an optical axis of a photographing lens in order to correct image blurring caused by camera-shake or the like. It is checked whether or not pixels comprising a valid pixel region 101 of the CCD are located outside an image circle 100 of the photographing lens after driving for image blur correction. This check is carried out for each time of image blur correction repeated for the unit of a predetermined time during a charge accumulation time, and a time for each pixel to be located outside the image circle 100 is measured. Based on this time, a correction coefficient of luminance information is operated and luminance information of each of pixels obtained after the lapse of the charge accumulation time is corrected by the correction coefficient. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital camera having an image blur correction function.

Conventionally, some digital cameras have an image blur correction function. In the image blur correction process using the image blur correction function, first, for example, a blur (a blur direction and a blur amount) of a digital camera is calculated based on a gyro sensor. Then, a solid-state imaging device such as a CCD or a correction optical system that constitutes a part of the photographing optical system is driven so that the calculated blur is canceled. As a result, image blur caused by camera shake or the like is corrected, and a good image is obtained.
JP-A-63-217778

  Normally, the solid-state image sensor is arranged so that the center of its effective area coincides with the center of the image circle of the photographing optical system, and the photographing optical system is optical Designed. Here, the image circle is a limit outer circumference circle that can obtain a light quantity of a predetermined ratio or more (for example, 50% or more) with respect to the light quantity on the optical axis of the photographing optical system. Therefore, in the optical image formed by the photographing optical system, the portion located outside the range of the image circle has low brightness and sharpness is also reduced.

  However, when the solid-state imaging device or the correction optical system is driven by the above-described image blur correction, the relative positional relationship between the image circle and the solid-state imaging device is lost, and a part of the solid-state imaging device comes out of the image circle. May end up. As described above, since the brightness of the portion outside the image circle in the optical image is low, there is a problem that a high-quality image cannot be obtained even if image blur correction is performed.

  In order to solve such a problem, even if the relative positional relationship between the photographing optical system and the solid-state image sensor changes during image blur correction, the image circle is always located in the image circle. Can be considered to be sufficiently large. However, in order to enlarge the image circle, it is necessary to increase the size of the photographing optical system, and as a result, there is a problem that miniaturization of the digital camera is prevented.

  The present invention solves the above-described problems, and an object thereof is to reduce the size of a digital camera having an image blur correction function.

  The digital camera according to the present invention includes an image blur correcting unit that corrects an image blur by adjusting a relative positional relationship between an optical axis of a photographing optical system and an imaging center of an image sensor, and an image blur correction by the image blur correcting unit. As a result of the processing, the image pickup device is provided with a luminance correction unit that corrects luminance information of a pixel located outside the image circle of the photographing optical system.

Preferably, the luminance correction unit causes each pixel of the image sensor to go out of the image circle in an image blur correction process that is repeatedly executed at predetermined time intervals by the image blur correction unit during the charge accumulation time of the image sensor. Measuring means for measuring the number of times determined to be, and weighting for amplifying the luminance information of each pixel of the image sensor based on the number of times measured by the measuring means, and the luminance of each pixel based on this weighting Luminance information adjusting means for amplifying the information.

  Preferably, the measurement unit includes a unit that calculates a distance from the center of the image circle to the pixel of the image sensor, a comparison unit that compares the distance calculated by the calculation unit and the length of the radius of the image circle, Determination means for determining whether the pixel is located outside the image circle based on the comparison result.

  The image blur correction unit is, for example, along the plane in which the optical axes of the photographing optical system are orthogonal so that the blur detection unit for detecting the blur amount of the digital camera and the blur amount detected by the blur detection unit are offset. And a control means for driving the image sensor.

  The brightness correction unit corrects the brightness information based on a time during which each pixel is out of the image circle in the image blur correction process. Furthermore, the brightness correction unit corrects the brightness information based on the distance from the optical axis of the pixel of the image sensor that has been moved by the image blur correction process.

  In addition, the digital camera according to the present invention includes an image blur correction unit that corrects image blur by driving the image sensor with respect to the optical axis of the photographing optical system, and an image sensor that is moved by image blur correction processing of the image blur correction unit. A calculating means for calculating a moving distance of the pixel from the optical axis of the photographing optical system, and a luminance correcting means for correcting the luminance information of the pixel in accordance with the moving distance calculated by the calculating means. To do.

  Further, the brightness correction method according to the present invention includes means for detecting the distance from the optical axis of the pixel of the image sensor when the image sensor is moved by image blur correction processing by the image blur correction unit of the digital camera. And a correction unit that amplifies the luminance of the pixel based on the distance.

  As described above, according to the present invention, the luminance information of the part of the image sensor that protrudes outside the image circle of the photographing optical system is corrected by image blur correction. In addition, the luminance information is corrected according to the moving distance of the pixels constituting the image sensor from the optical axis of the imaging optical system. Therefore, an image obtained by image blur correction can be improved in image quality while suppressing an increase in the image circle.

  FIG. 1 is a front view of a digital camera to which an embodiment according to the present invention is applied, and FIG. 2 is a perspective view showing the digital camera from the back. A Pon button 11 for turning on / off the power is provided on the back surface of the digital camera 1, and a release button 13 is provided on the top surface. Reflected light from the subject is guided into the digital camera 1 by the photographing lens 10 and forms an image on a light receiving surface of a CCD, which will be described later, via an image blur correction unit 15. The image data acquired by the CCD is subjected to predetermined image processing and reproduced on the LCD 16 on the back of the digital camera 1. Further, by operating the image blur correction button 14, the image blur correction is started / stopped.

  In the present embodiment, the first direction x is a direction orthogonal to the optical axis OP of the photographing optical system, and corresponds to the horizontal direction in the normal holding posture of the digital camera 1. The second direction y is a direction perpendicular to the optical axis OP and perpendicular to the first direction x, and corresponds to the vertical direction in the normal holding posture of the digital camera 1. The third direction z coincides with the optical axis OP.

  A first angular velocity sensor 26 and a second angular velocity sensor 27 are provided in the digital camera 1. The first angular velocity sensor is a sensor for detecting the rotational angular velocity around the y-axis (axis along the second direction y), and the second angular velocity sensor is the x-axis (axis along the first direction x). These are sensors for detecting the surrounding rotational angular velocity, and for example, a gyro sensor is used.

  FIG. 3 is a block diagram of the digital camera 1. The switch 11 a is a switch that is turned on / off in conjunction with the operation of the Pon button 11. When the switch 11 a is turned on, power is supplied to each circuit of the digital camera 1.

  When the release button 13 is half-pressed, the photometry switch 12a is turned on to start photometry processing. When the release button 13 is fully pressed, the release switch 13a is turned on and imaging processing is started. The image blur correction switch 14 a is a switch that is turned on / off in conjunction with the operation of the image blur correction button 14. The image blur correction process described later is started when the image blur correction switch 14a is turned on, and is stopped when the image blur correction switch 14a is turned off.

  The AE unit 23 performs a photometric operation of the subject to calculate an exposure value, and calculates an aperture value and an exposure time (charge accumulation time) necessary for photographing based on the exposure value. The AF unit 24 performs distance measurement, and performs focus adjustment by displacing the photographing lens 10 in the direction of the optical axis OP based on the distance measurement result.

  When the release switch 13a is turned on, a control signal is output from the CPU 20 to the CCD drive circuit 21. Based on the control signal from the CPU 20, a drive signal is output from the CCD drive circuit 21 to the CCD 39a. As a result, photoelectric conversion of the optical image formed on the light receiving surface of the CCD 39a is performed by the photographing lens 10, and image data is output from the CCD 39a. The image data output from the CCD 39 a is subjected to A / D conversion and predetermined image signal processing in the image signal processing unit 22 and stored in the image memory 50.

  The angular velocity detection unit 25 includes first and second angular velocity sensors 26 and 27 and an amplifier / high pass filter circuit 28. The first and second angular velocity sensors 26 and 27 detect the angular velocities around the y axis and the x axis at regular intervals (1 ms) of the digital camera 1. The amplifier / high pass filter circuit 28 amplifies the signal related to the angular velocity, cuts the null voltage and panning of the first and second angular velocity sensors 26, 27, and outputs an analog signal as the first and second angular velocities vx, vy of the CPU 20 Input to A / D0 and A / D1.

  The CPU 20 performs A / D conversion on the first and second angular velocities vx and vy input to A / D0 and A / D1, and then performs integration processing, and in a certain time (1 ms) by a conversion coefficient considering the focal length and the like. The amount of image blur that has occurred is calculated. That is, the displacement amount of the digital camera 1 in the first direction x is calculated based on the output of the first angular velocity sensor 26, and the displacement amount of the digital camera 1 in the second direction y is calculated based on the output of the second angular velocity sensor 27. Is done.

  The CPU 20 calculates, for each of the first direction x and the second direction y, the position S to which the CCD 39a should move according to the image blur amount obtained by the calculation. The first direction x component of the position S is sx, and the second direction y component is sy. The movable part 30a including the CCD 39a is moved by an electromagnetic force described later. In order to move the movable part 30a to this position S, the first direction x component of the driving force D that drives the driver circuit 29 is defined as a first PWM duty dx, and the second direction y component is defined as a second PWM duty dy.

  The image blur correction device 30 is a device that cancels the displacement of the digital camera 1 due to camera shake and the like and corrects the image blur by moving the CCD 39a to the position S to be moved calculated by the CPU 20. The image blur correction device 30 includes a movable part 30a including a CCD 39a and a movable area, and a fixed part 30b. The movable portion 30a is supported by a predetermined support mechanism (not shown) so as to be movable along the first direction x and the second direction y.

  The movement of the movable portion 30a of the image blur correction apparatus 30 in the first direction x is performed by the first driving coil 31a provided in the movable portion 30a, the first driving permanent magnet 33b provided in the fixed portion 30b, and the first. This is performed by a drive unit including the drive yoke 35b. The movable portion 30a is moved in the second direction y by a second drive coil 32a provided in the movable portion 30a, a second drive permanent magnet 34b and a second drive yoke 36b provided in the fixed portion 30b. It is performed by the drive part which consists of. That is, the movement of the movable portion 30a is controlled by controlling the current direction and the current value of the first and second drive coils 31a and 32a.

  The first and second drive coils 31 a and 32 a are connected to the driver circuit 29. Accordingly, the driving of the movable portion 30a of the image blur correction device 30 is controlled by the driver circuit 29 that receives the output of the first PWM duty dx from the PWM0 and the second PWM duty dy from the PWM1 of the CPU 20.

  The position P before or after the movement of the movable portion 30a moved by driving the driver circuit 29 is the Hall element portion 44b and the Hall element signal processing circuit 45 used in combination with the position detecting permanent magnet 41a and the position detecting yoke 43b. Detected by. Information on the detected position P is input to the A / D2 and A / D3 of the CPU 20 with the first detection position signal px as the first direction x component and the second detection position signal py as the second direction y. The first and second detection position signals px and py are A / D converted via A / D2 and A / D3. The first direction x component and the second direction y component of the position P after A / D conversion with respect to the first and second detection position signals px and py are set to pdx and pdy, respectively. PID control is performed based on the data of the detected position P (pdx, pdy) and the data of the position S (sx, sy) to be moved.

  FIG. 4 is a diagram showing the relative positional relationship between the image circle of the taking lens 10 and the CCD 39a. The center 100c of the image circle 100 coincides with the optical axis OP of the photographing lens 10. The effective pixel area 101 is a rectangular area formed by the effective pixels of the CCD 39a. When the image blur switch 14 a is off and the image blur correction function is stopped, the movable portion 30 a is positioned so that the optical axis OP passes through the center 101 c of the effective pixel region 101. The center 101c is an intersection of two diagonal lines that the effective pixel region 101 has. In the present embodiment, the positions of the movable portion 30a and the CCD 39a at this time are referred to as “movement center”. The taking lens 10 is optically designed so that the effective pixel area 101 of the CCD 39a when located at the moving center is within the image circle 100.

  As described above, in the present embodiment, the shake of the digital camera 1 caused by camera shake or the like is canceled by driving the CCD 39a. That is, the drive amount of the CCD 39a is determined according to the image blur amount. As a result, depending on the amount of image blur, some of the pixels of the driven CCD 39a may protrude from the image circle 100 of the photographing optical system. Therefore, the CPU 20 executes a brightness correction routine described below during the charge accumulation time, and corrects the brightness information of the pixels of the CCD 39a that protrudes outside the image circle 100.

  FIG. 5 is a flowchart showing a processing procedure of a luminance correction routine executed during the charge accumulation time of the CCD 39a after the release button 13 is fully pressed, the release switch 13a is turned on, and the imaging process is started. In step S100, “1” is set to a variable n indicating the number of times of image blur correction. In addition, “0” is set to a variable Gi that counts the number of pixels determined to protrude from the image circle 100 at predetermined time intervals within the charge accumulation time. Here, the subscript i of the variable Gi is a variable for identifying each effective pixel (described later). Finally, the variable Gi correlates with the time that each pixel protrudes outside the image circle 100 within the charge accumulation time. Next, in step S102, an image blur correction routine is executed.

  FIG. 6 is a flowchart showing the processing procedure of the image blur correction routine. In step S200, the first and second angular velocities vx and vy output from the angular velocity detector 25 are A / D converted and input via A / D0 and A / D1 of the CPU 20. In step S202, the first and second detection position signals px and py of the movable portion 30a, which are detected by the Hall element portion 44b and calculated by the Hall element signal processing circuit 45, are obtained from the A / D2 and A / D3 of the CPU 20, respectively. Via A / D conversion. Thus, the current position P (pdx, pdy) is obtained.

  In step S204, the state of the image blur correction switch 14a is checked to check whether the image blur correction mode is set. If it is not the image blur correction mode, in step S206, the position S (sx, xy) to which the movable part 30a should move is made the same as the movement center position of the movable part 30a. In the case of the image blur correction mode, in step S208, the position S (sx, sy) to which the movable unit 30a should move is calculated from the first and second angular velocities vx, vy obtained in step S200.

  In step S210, from the position S (sx, sy) determined in step S206 or step S208 and the current position P (pdx, pdy), the driving force D necessary for the movement of the movable portion 30a, that is, the first and second driving coils. First and second PWM duties dx and dy necessary for driving 31a and 32a are calculated. In step S212, the first and second drive coils 31a and 32a are driven via the driver circuit 29 by the first and second PWM duties dx and dy, and the movable portion 30a is moved. The operations in steps S210 and S212 are automatic control calculations used in PID automatic control that performs general proportional, integral, and proportional calculations.

  When the image blur correction routine is completed as described above, the control returns to step S102 in FIG. 5, and then proceeds to step S104. In step S104, it is checked whether or not the charge accumulation time calculated by the CPU 20 has elapsed after the release button 13 is pressed halfway and the photometric switch 12a is turned on. The passage of the charge accumulation time is determined based on the result of the calculation according to the equation (1).

In equation (1), “Δt” is one cycle time for repeating the image blur correction process, and “T _S ” is the charge accumulation time. If it is confirmed that the charge accumulation time has not elapsed, the process proceeds to step S106.

  In step S106, “1” is set to a variable i for identifying each effective pixel, which is a variable i indicating the effective pixel for which the determination process of whether or not the effective pixel is outside the image circle 100 is actually performed. . In step S108, the variable i is compared with the effective pixel number M of the CCD 39a to check whether the processing of this routine has been executed for all effective pixels. If it is confirmed that the processing has not been completed for all effective pixels, the process proceeds to step S110.

  Next, in step S110, it is checked whether or not the pixel currently being processed is located outside the image circle 100. The processing of this step will be described with reference to FIG. In FIG. 7, Pi is a pixel currently being processed (the subscript i corresponds to the variable i). A circle 102 is a maximum outer circumference circle of the light beam guided by the photographing lens 10. Whether or not the pixel Pi is located outside the image circle 100 is determined based on Expression (2).

  In Expression (2), “xi” is a distance along the first direction x between the center 101c of the effective pixel region 101 and the pixel Pi, and “yi” is between the center 101c of the effective pixel region 101 and the pixel Pi. The distance along the second direction y. “XL” is a distance along the first direction x between the center 100c of the image circle 100 and the center 101c of the effective pixel region 101, and the first direction of the position S of the CCD 39a moved according to the image blur amount. It corresponds to the component sx of x. “YL” is a distance along the second direction y between the center 100c of the image circle 100 and the center 101c of the effective pixel region 101, and the second direction of the position S of the CCD 39a moved according to the image blur amount. It corresponds to the component sy of y. “R” is the radius of the image circle 100 and is arbitrarily set depending on the characteristics of the imaging lens and the required image quality.

  What is calculated from the right side of the equation (2) is the linear distance PL from the center 100c to Pi. By comparing the distance PL with the radius R, it is determined whether or not Pi is located outside the image circle 100.

  In step S110, if it is confirmed that the pixel Pi to be processed is out of the image circle 100, the process proceeds to step S112, which corresponds to the number counted when the pixel Pi is out of the image circle 100. The value of the variable Gi is incremented by “1”. Next, the process proceeds to step S114. If it is confirmed in step S110 that the pixel to be processed does not protrude from the image circle 100, the process of step S112 is skipped and the process proceeds to step S114. In step S114, the variable i indicating the number of pixel image blur correction is incremented by “1”. Next, the process returns to step S108, and the above process is repeated.

  If it is confirmed in step S108 that the value of the variable i exceeds the effective pixel number M, the processes in steps S110 and S112 are executed for all the effective pixels of the CCD 39a after the execution of the image blur correction routine in step S102. Since it is determined that the process has been performed, the process proceeds to step S116. In step S116, the variable n indicating the number of times of image blur correction is incremented by “1”, the process returns to step S102, and the above-described processing is repeated.

  If it is confirmed in step S104 that the charge accumulation time of the CCD 39a has elapsed as a result of the calculation by the above equation (1), the process proceeds to step S118. In step S118, a luminance correction subroutine for calculating the luminance correction coefficient and correcting the luminance information of each pixel using the luminance correction coefficient is called.

  FIG. 8 is a flowchart showing the procedure of the luminance correction subroutine. In step S300, “1” is set to a variable i for identifying each effective pixel and indicating a valid pixel for which the luminance correction processing is actually performed. Next, in step S302, the value of the variable i is compared with the number M of pixels in the effective pixel area 101 of the CCD 39a to check whether the processing of this subroutine has been performed for all effective pixels.

  If it is confirmed in step S302 that there is an unprocessed pixel, the process proceeds to step S304. In step S304, a luminance correction coefficient “Ki” for correcting the luminance of the pixel Pi is calculated. The calculation of the luminance correction coefficient is performed based on Expression (3). In equation (3), “k” is a predetermined luminance correction constant.

  In step S306, the luminance information of the pixel Pi is corrected based on the calculated luminance correction coefficient “Ki”. For example, the luminance of the pixel Pi is amplified in the image signal unit using the luminance correction coefficient Ki calculated by the CPU 20. Thereafter, the variable i is incremented by “1” in step S308, the process returns to step S302, and the above-described processing is repeated. In step S302, when it is confirmed that the processes in steps S304 to S306 have been executed for all the effective pixels, the present subroutine ends. Thereafter, the control returns to step S118 in FIG. 5, and the luminance correction routine ends.

  As described above, in the present embodiment, the luminance of the pixels out of the image circle 100 of the photographing lens 10 among the effective pixels of the CCD 39a is amplified by image blur correction. Therefore, it is not necessary to increase the size of the taking lens 10 until the image circle 100 can sufficiently cover the maximum drive range of the CCD 39a determined by the mechanical configuration of the movable portion 30a. That is, in the digital camera 1 equipped with the image blur correction function, it is possible to suppress an increase in the size of the taking lens 10, to reduce the size of the entire digital camera, and to improve the image quality at the time of image blur correction.

In this embodiment, the time when the effective pixel of the CCD 39a moved by the image blur correction process protrudes outside the image circle 100 within the charge accumulation time (determined that the effective pixel was outside the image circle within the charge accumulation time. The luminance is amplified on the basis of the corresponding number), but is not limited to this. The luminance of each effective pixel may be corrected in consideration of the distance from the optical axis OP of each effective pixel after moving by the image blur correction process, that is, how far away from the optical axis OP. . That is, a distance correction coefficient capable of canceling a change in luminance distribution along the radial direction due to lens characteristics is introduced instead of Gi in Expression (3). For example, when the luminance distribution is represented by f (r) (r: radial parameter), the distance correction coefficient is a function including α × (1−f (r)) (where α is a constant determined by the lens). . Specifically, as shown in the flowchart of FIG. 9, the value of the distance correction coefficient Fi (PL) for each effective pixel Pi is Fi (PL) + α × (1−f (PL)) in step S113. Is obtained by sequentially calculating. In this modified embodiment, the distance correction coefficient Fi (PL) is multiplied in place of Gi in the expression (3) in step S304 of the luminance correction subroutine shown in FIG. Incorporated into Ki. That is, equation (4) is used instead of equation (3).

  Here, the flowchart of FIG. 9 is the same as the flowchart of FIG. 5 except that step S100 is replaced with step S101, step S112 is replaced with step S113, and step S110 is deleted. In step S101, Fi (PL) is initialized instead of Gi, and Fi (PL) = 0.

  In the present embodiment, after the release switch 13a is turned on, the image blur correction routine is called from the brightness correction routine repeated every 1 msec, but the present invention is not limited to this. After the release switch 13a is turned on, the image blur correction routine is repeatedly executed every 1 msec, and the luminance information and position information of each pixel obtained by the execution of the routine are stored in a predetermined memory. After the accumulation time elapses, pixel brightness adjustment may be executed based on the data.

  Alternatively, the coefficient Ki for each effective pixel may be recorded in the image memory 50 in association with the image data, and the data may be transferred to an external device such as a computer, and brightness correction may be performed in the external device.

  In this embodiment, the digital camera of the type that performs image blur correction by driving the CCD 39a has been described as an example, but the present invention is not limited to this. The present invention can also be applied to a digital camera of a type in which a correction optical system that constitutes a part of the photographing optical system is provided and image blur correction is performed by driving the correction optical system so that the calculated blur amount is canceled.

1 is a front view of a digital camera to which an embodiment according to the present invention is applied. It is a perspective view of a digital camera. It is a block diagram of a digital camera. It is a figure which shows the relative positional relationship of the image circle of a taking lens, and the effective pixel area | region of CCD. It is a flowchart which shows the process sequence of a brightness correction routine. It is a flowchart which shows the process sequence of an image blurring correction routine. It is a figure which shows the relative positional relationship of the effective pixel area | region of CCD driven by the image blurring correction process, and the image circle of a photographic lens. It is a flowchart which shows the process sequence of a brightness correction subroutine. It is a flowchart which shows the process sequence of the brightness | luminance correction routine in deformation | transformation embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital camera 10 Shooting lens 11 Pon button 13 Release button 14 Image blur correction button 20 CPU
DESCRIPTION OF SYMBOLS 21 CCD drive circuit 22 Image signal processing unit 25 Angular velocity detection part 30 Image blur correction apparatus 45 Hall element signal processing circuit 50 Image memory

Claims (8)

Image blur correction means for correcting image blur by adjusting the relative positional relationship between the optical axis of the imaging optical system and the imaging center of the image sensor;
As a result of the image blur correction process by the image blur correction unit, the image pickup device includes a luminance correction unit that corrects luminance information of pixels that are located outside the image circle of the photographing optical system. A featured digital camera. The brightness correction means includes
It is determined that each pixel of the image sensor is out of the image circle in an image blur correction process that is repeatedly executed at predetermined time intervals by the image blur correction unit during the charge accumulation time of the image sensor. A measuring means for measuring the number of times;
Luminance information adjusting means for performing weighting for amplifying the luminance information of each pixel of the image sensor based on the number of times measured by the measuring means, and amplifying the luminance information of the pixel based on the weight; The digital camera according to claim 1, further comprising: The measuring means includes
Means for calculating a distance from a center of the image circle to a pixel of the image sensor;
A comparing means for comparing the distance calculated by the calculating means with the length of the radius of the image circle;
The digital camera according to claim 2, further comprising: a determination unit that determines whether the pixel is located outside the image circle based on a comparison result of the comparison unit. The image blur correcting means includes
A shake detection means for detecting the shake amount of the digital camera;
2. The digital device according to claim 1, further comprising a control unit that drives the image sensor along a plane perpendicular to the optical axis so that the amount of blur detected by the blur detection unit is canceled out. camera.   2. The digital camera according to claim 1, wherein the luminance correction unit corrects the luminance information based on a time during which each of the pixels is out of the image circle in the image blur correction process.   The digital camera according to claim 5, wherein the brightness correction unit further corrects the brightness information based on a distance from the optical axis of a pixel of the imaging element moved by the image blur correction process. Image blur correction means for correcting image blur by driving an image sensor with respect to the optical axis of the photographing optical system;
Calculating means for calculating a moving distance from the optical axis of the pixel of the imaging element moved by the image blur correction process of the image blur correcting means;
A digital camera comprising: a luminance correction unit that corrects luminance information of the pixel according to the movement distance calculated by the calculation unit. Means for detecting a distance from an optical axis of a pixel of the image sensor when the image sensor is moved by image blur correction processing by an image blur correction unit of a digital camera;
And a correction unit that amplifies the luminance of the pixel based on the distance.

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