JP3720683B2 - Imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus having a pseudo signal correction function.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a solid-state imaging device using a CCD image sensor, image degradation due to a smear phenomenon that occurs when intense light enters is a problem as a phenomenon unique to the CCD image sensor. That is, this phenomenon is due to the charge that was not trapped in the original charge accumulation region leaking into the vertical transfer path over the potential barrier. This phenomenon occurs over the vertical transfer period when it is caused by normal stationary light.For example, in the case of spot light, it becomes a vertical line extending up and down, and for example, high brightness such as a landscape including the sky. In the case of a subject whose part extends in the horizontal direction, the entire screen becomes a flared white image.
[0003]
As a method of correcting this phenomenon, paying attention to the fact that smear is generated at substantially the same level in the vertical direction from the generation principle, vertical OB (optical black: optical black) which is a light-shielded accumulation pixel region outside the effective pixel region. A method of subtracting the output level of the black pixel from the smear removal reference signal and subtracting it from the pixel output signal of the effective screen is disclosed in, for example, Japanese Patent Laid-Open No. 7-67038.
[0004]
In particular, in this disclosed publication, line information (one line of one line) obtained by averaging the signals of vertical OB pixels composed of a plurality of lines (12 lines in the embodiment) (average for every 12 pixels in the vertical direction). By using the smear removal reference signal as the average value data corresponding to the pixel, the influence of the random noise included in the reference signal is reduced, and new fixed pattern noise is generated due to the smear correction. Consideration is not given.
[0005]
In addition, a special drive method may be used in an image pickup apparatus using a CCD image pickup element. Here, as an example of a typical special drive method, a known “n-times high-speed vertical addition drive (n-addition drive)” that is high-speed and high-sensitivity readout drive will be described. In this driving method, the number of pixels (number of transfer clocks) transferred from the V (vertical) transfer path to the H transfer path in each H (horizontal) blanking period is set to an integer value n of 2 or more instead of the usual 1 As a result, the number of vertical lines corresponding to one screen is reduced to 1 / n. As a result, the readout time for one screen is reduced to 1 / n, and the sensitivity is increased n times by charge addition during transfer.
[0006]
As a developed form of this driving method, in consideration of the color coding pattern in the color image sensor and for the purpose of appropriately adjusting the sensitivity, the charge transfer from the pixel (signal storage) area prior to the V transfer to the V transfer path is performed. Also, “m / n addition driving” that selectively transfers only specific m (≦ n) lines among n lines added at the time of transfer from the vertical transfer path to the horizontal transfer path is also used (“n addition”). Drive "is included as a special case, i.e.," n / n addition drive "with m = n). However, since the description of the present invention is also essentially the same, the following description will be made taking the case of m = n, that is, the above-described n-addition drive as a representative example including these. And
[0007]
[Problems to be solved by the invention]
By the way, the smear correction method of the above prior art is based on the assumption of normal driving, and cannot be applied to an imaging apparatus that performs special driving such as the n addition driving method. Specifically, as disclosed in the above publication, if the smear removal reference signal is obtained as “average value data corresponding to one line pixel” and subtracted and corrected, the output in the n addition drive system Since the smear component included in the signal has become n lines by the addition at the time of transfer, the smear component for n-1 lines remains without being removed. In addition, when there is a pixel defect in the vertical OB pixel, this information is also included in the smear removal reference signal, so that there is another problem that new fixed pattern noise is generated by the correction.
[0008]
The present invention has been made in order to solve the above-described problems in an imaging apparatus provided with a conventional smear correction unit. The invention according to claim 1 can perform each readout even in the case of having a plurality of imaging element readout modes. Appropriate smear correction can be performed for the mode, and even when addition reading (n-addition driving) intended to shorten the reading time is used, there is no problem with smear correction during still image shooting. An object of the present invention is to provide an imaging apparatus. And claims 2 In the invention according to the present invention, addition reading (n addition driving) is aimed at shortening the reading time. The An object of the present invention is to provide an imaging apparatus capable of minimizing a smear correction defect that occurs in the moving image imaging mode to be used.
[0009]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 is directed to a CCD image pickup device and an effective pixel portion of the image pickup device based on an output signal in the frame period of a vertical optical black pixel portion of the CCD image pickup device. An intra-frame smear correction reference signal generating means for generating a reference signal for correcting an effective image signal that is an output signal in the frame period, an image signal correcting means for subtracting the correction reference signal from the effective image signal, As a reading method when reading the pixel charge as an output signal by driving the image pickup device, each pixel charge of the image pickup device is read individually or by adding a predetermined number n (n is an integer of 2 or more) in the vertical direction. The image sensor driving means having a plurality of readout modes relating to the readout method, and the plurality of the image sensor driving means. One of the reading modes is a moving image that is read by adding each pixel charge of the effective pixel portion of the image sensor and the vertical optical black pixel portion by a predetermined number n (n is an integer of 2 or more) in the vertical direction. The other is an imaging mode, and the other is to read out by adding each pixel charge of the effective pixel portion of the imaging device by a predetermined number n (n is an integer of 2 or more) in the vertical direction. When reading out the pixel portion, the image pickup apparatus is configured as a still image pickup mode for switching between individual reading of each pixel charge and addition reading of the predetermined number n for each frame.
[0010]
In this way, by configuring so that the correction reference signal is generated corresponding to the moving image capturing mode and the still image capturing mode, problems such as the generation of new noise due to the correction processing are minimized for each imaging mode. In addition, it is possible to perform excellent smear correction, and even when using addition readout (n-addition drive) intended to shorten the readout time, imaging is performed so as not to cause a smear correction defect during still image shooting. An apparatus can be realized.
[0011]
Claim 2 The invention according to claim 1 is characterized in that, in the image pickup apparatus according to claim 1, correction by the image signal correction means is not performed in the moving image pickup mode. With this configuration, it is possible to minimize a smear correction defect that occurs in the moving image capturing mode that uses addition reading (n-addition driving) intended to shorten the reading time.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments will be described. FIG. 1 is a block configuration diagram showing a digital camera according to a first embodiment of an imaging apparatus according to the present invention. 1 is a lens system, 2 is a lens drive mechanism, 3 is an exposure control mechanism, 4 is a filter system, 5 is a CCD imaging device, 6 is a CCD driver, 7 is a preprocess circuit including an A / D converter, and 8 is a digital process circuit. Thus, a memory is included as hardware, and all digital process processing is performed. 9 is a memory card interface, 10 is a memory card, 11 is an LCD image display system, 12 is a system controller including a microcomputer as a main configuration, 13 is an operation switch system, 14 is an operation display system including a display LCD, 15 is a strobe, 16 Is a lens driver, 17 is an exposure control driver, and 18 is an EEPROM.
[0013]
In the digital camera configured in this way, the system controller 12 performs all the control, and the exposure control mechanism 3 and the CCD driver 6 control the drive of the CCD image pickup device 5 to perform exposure (charge). Storage) and reading out the signal, storing it in the digital process circuit 8 via the pre-process circuit 7 including the A / D converter, performing all necessary various signal processing therein, and then displaying the LCD image Display on system 11 or record on memory card 10.
[0014]
Various signal processing performed in the digital process circuit 8 includes smear correction processing using output level information of vertical OB pixels, which is the main part of the present invention. That is, the digital process circuit 8 includes a correction reference signal generation unit 8-1 that generates a smear removal reference signal based on the output level of the vertical OB pixel, and an image signal in the effective pixel region using the smear removal reference signal. An image signal correction unit 8-2 for correction (smear removal) is provided. Further, when reading out the image pickup signal, the drive clock pattern of the CCD driver 6 is appropriately changed as necessary to perform normal driving and arbitrary n addition driving.
[0015]
FIG. 2 is a schematic view showing a sensor area of the CCD image pickup device 5. The sensor area includes an effective pixel portion EP which is an image pickup area formed of a pixel array arranged substantially at the center, and black reference in the vertical and horizontal directions. OB (optical black pixel portion) for determining VOB and HOB. In the present embodiment, this optical black pixel portion OB is 12 above the effective pixel portion EP in the vertical direction. It consists of a VOB which is a vertical OB composed of a pixel array of lines and an HOB which is a horizontal OB of 40 pixels in the horizontal direction on the right side of the effective pixel portion EP. These OB regions have a structure in which a light-shielding film is provided on the sensor, and the smear is present in the VOB as well as the effective pixel portion EP. Usually, the effective pixel portion is included in the imaging output signal obtained from this VOB. A smear signal is included at the same level as the imaging output signal obtained from the EP.
[0016]
A dummy bit DB, which is an additional vertical transfer path for 12 lines, is provided immediately before the horizontal transfer path (horizontal shift register) 101 at the lower end of the vertical transfer path of the CCD image pickup device 5. The light is shielded similarly to the horizontal transfer path 101 and the OB area. Therefore, smear does not occur during DB transfer. In FIG. 2, reference numerals 102 and 103 denote examples of smear that occurs when correction processing is not performed.
[0017]
Note that the digital camera according to the present embodiment performs a movie (continuous imaging) operation corresponding to an electronic viewfinder for composition determination and a still (still image imaging) operation that is a main imaging. The exposure time is controlled only by the so-called element shutter by controlling the charge accumulation. Even in the case of a still, when it is difficult to use a mechanical shutter together during continuous shooting, the exposure time control using only the element shutter is also used. For this reason, at least in such a case, if correction is not performed, smear as described in the above prior art will occur. Therefore, the smear correction process is applied to at least such a case.
[0018]
In order to simplify the explanation, in the following explanation, the digital camera according to the present embodiment does not have a mechanical shutter, and the exposure time control is performed only with the element shutter, including the case of taking a still image of only one frame. Shall be. In the case of the movie operation of the digital camera according to the present embodiment, all the images output for each successive frame (field in the case of interlaced driving, the same applies hereinafter) are used for display. Only one frame or only one frame image is recorded (and displayed) every two frames at the time of continuous shooting. When n-addition driving is used, smear correction is performed by performing different imaging device driving and arithmetic processing corresponding to the movie operation and the still operation.
[0019]
Next, camera control by the system controller 12 will be described focusing on processing directly related to smear correction in the digital camera according to the present embodiment. The EEPROM 18 stores the address of the defective pixel of the image pickup device 5 obtained in advance by inspection in the manufacturing process, including the OB area. However, the defect judgment criteria for the effective area and the OB area at the time of inspection are different, and a more severe level condition is applied to the OB area. Address information of defective pixels in the effective area is used for known pixel defect compensation processing, and description thereof is omitted.
[0020]
Now, when an imaging output signal corresponding to one screen from which signal charges generated by exposure in each of the above operations are sequentially read is stored in a predetermined memory area of the digital process circuit 7, first, in the correction reference signal generation unit 8-1, A smear removal reference signal is calculated using the output of VOB which is vertical OB. Here, when there is no pixel defect and normal driving is performed, 12 pixels having the same horizontal address among the OB pixel data of 12 lines (in the following description, as in the prior art described in the above publication) (The pixel group of 12 pixels is referred to as a rod), and the average value is obtained by dividing the sum by 12 pixels. That is, the smear removal reference signal is obtained by using one line of image signal in which each rod average value corresponds to one pixel.
[0021]
The smear correction process by the image signal correction unit 8-2 in the present embodiment is characterized in that the drive mode and pixel defects are also taken into consideration during this process. For this reason, the driving method is also devised, and different processing is performed during movie operation and still operation. Next, processing during movie operation and still operation in the case of n addition driving will be described.
[0022]
(1) During movie operation
As the driving method of the image sensor, the above-described conventionally known n-addition driving method is similarly used for the entire scanning region including the OB region. Therefore, n pixels are added to both the pixels in the OB area and the effective area, and the number of output pixels (number of data) at the time of reading each rod is reduced to [12 / n] (an integer quotient obtained by dividing 12 by n). Yes. At this time, depending on the value of n or the like, there is signal data obtained by adding the charges of the VOB pixel that is the vertical OB area and the pixel of the effective area EP, or signal data that does not include n pixel signals corresponding to the end portion. Although this data is output, it cannot be used as an OB or an effective output signal as it is, and is discarded data that is not used as data.
[0023]
Prior to obtaining the sum of the rods for smear correction, the address of the defective pixel stored in the EEPROM 18 is referred to. When there is a defective pixel in the rod, it is determined whether there is output signal data by adding n non-defective pixels only that do not include a defective pixel, and if there is a sum of data of only such non-defective pixels ( If there is only one, the value is obtained as it is). By dividing this by “[12 / n] (number of rod data) minus the number of data including defective pixels (number of data of only non-defective pixels of the rod)”, An average value corresponding to n pixels relating to only non-defective pixels is obtained. In other words, the smear removal reference signal is a 1-line image signal having an average value of read data not including defective pixels of each rod during n addition driving. Therefore, at this time, in the smear correction, (1) correction at an appropriate level according to the drive mode is performed, and (2) there is no influence of pixel defects in the OB region.
[0024]
On the other hand, when there are many defects or n is a large value, there may be a case where there is no output signal data by adding n non-defective pixels only, which does not include defective pixels with respect to the rod. For example, when n ≧ 7> the number of rod pixels / 2, the number of output data of the rod is 1, so if any one of the n pixels corresponding to the data has a defect, the above state become. In such a case, it is unavoidable, and even if a defect is included, it is ignored and the sum of each data (the value as it is when there is only one) is obtained. Also in this case, although the influence of the defective pixel cannot be removed, the influence of the defect is relatively reduced in the process of n addition and data sum calculation.
[0025]
That is, in some cases, the processing may be incomplete due to the presence of a pixel defect. However, unlike the conventional technique, it can handle n-addition driving and can perform smear correction with improved performance. Since the movie operation in the still camera is mainly used for display for determining the composition, that is, a so-called electronic viewfinder or the like, this still exhibits a sufficient effect.
[0026]
(2) During still operation
In this case, the above-described conventionally known n-addition driving method is used for the effective region EP as the driving method of the image sensor. For the VOB that is the vertical OB area, the normal driving and the n addition driving are switched every other frame. Then, information on defective pixels that may not have been removed by the process at the time of driving the movie is completely removed.
[0027]
In this case, the target frame for recording or the like is a frame from which the effective pixel area EP is read out immediately after n addition driving is performed on the VOB. This is hereinafter referred to as a first frame. That is, considering the V transfer path immediately before the charge read out in the first frame is read out by the transfer pulse to the V transfer path, a constant n addition drive is performed over the drive of the previous one frame. Therefore, the state is equivalent to the case of the movie drive of (1) above. The same applies to the case where the charge is transferred and the pixel charge corresponding to the effective area EP of the first frame is read, and the data added by the n addition drive is output in the same manner as in the movie drive. After the reading of the effective area EP is completed, the pixel charge in the VOB area is transferred to the horizontal transfer path for the first time, and the normal driving with the transfer pixel number (vertical transfer clock number) in the H blanking period is switched to 1. To read out the pixel signal. When the reading of the VOB is completed, the original n addition drive is restored. Thereafter, when the image is continuously required continuously, the VOB of the next frame is read with the n addition drive, the next VOB is again the normal drive, and so on.
[0028]
At this time, in the normal drive state, all pixel charges in the VOB area have already been transferred to the dummy bit DB, which is a light-shielding portion, so that smear does not occur after this point. Then, when the pixel charge in the VOB area is transferred to the effective pixel area EP, it is exactly the same n addition drive as in the transfer of the charge in the effective pixel area EP read before this first frame. The smear component generated in the VOB output signal is completely the same as that of the effective pixel area EP. Therefore, when generating the smear removal reference signal, it is only necessary to consider that the data is not subjected to n addition. Specifically, it is as follows.
[0029]
First, prior to obtaining the sum of each rod, the address data of the defective pixel stored in the EEPROM 18 is referred to. If there is a defective pixel on the rod, the sum of only the remaining non-defective pixels excluding the pixel is obtained. Then, after multiplying this by n, it is divided by “12 (the total number of pixels of the rod) minus the number of defective pixels (the number of non-defective pixels of the rod)”. An average value corresponding to pixel addition is obtained. That is, the obtained smear removal signal is an image signal for one line, and each pixel signal constituting this signal has a value of “n times the average value of only non-defective pixels of each rod” It is. Therefore, when smear correction is performed, (1) correction at an appropriate level according to the drive mode is performed, and (2) there is no influence of pixel defects in the OB region.
[0030]
In this case, unlike the correction at the time of driving the movie in (1) above, VOB data is read out independently for each pixel, so that other non-defective pixels are taken along to remove one pixel defect. Even when there are relatively many pixel defects or the number of additions n is large, the smear removal reference signal can be generated only from the data of non-defective pixels. Since the divisor is adjusted in accordance with the removal of the defective pixel data, the weights of the non-defective pixels related to the rod of each OB line included in the smear removal reference signal are maintained at an equal ratio, and randomness is maintained. It is also excellent in that it does not adversely affect the noise reduction effect. In this way, the image quality of the image recorded during the still operation can be kept extremely good.
[0031]
When driving corresponding to the still operation is performed, VOB normal driving (non-addition) reading is performed once every two frames. With respect to a frame in which the effective pixel area EP is read immediately after the VOB normal drive readout (hereinafter referred to as a second frame), the image signal of the second frame is the effective pixel area during the VOB normal drive period. The vertical transfer path in the EP is being transferred. And during this period only, it is slower than the other periods and is transferred over a period of n times, so only the lines that were being transferred near the high-intensity subject image at that time are Therefore, it includes a relatively n times smear component at a higher level than the other lines, and becomes a new image quality degradation factor. Therefore, since the image of the second frame is not suitable for recording, only the image of the first frame is selectively used for still shooting recording.
[0032]
Using the smear removal reference signal thus obtained, smear correction relating to the effective pixel signal is performed. That is, the corrected output is obtained by subtracting the smear removal reference signal from each line data of the pixel signal read from the effective pixel portion EP. It will be obvious that the subtraction is performed between data having the same horizontal address.
[0033]
The image signal in the effective pixel area EP after the smear correction process is further subjected to pixel defect compensation by a conventionally known pixel defect compensation means. This processing is performed in the digital process circuit 8 based on the defective pixel address data stored in the EEPROM 18. At this time, it is meaningful to perform smear correction first and defect compensation later. If this is simply reversed, information on a pixel having a different horizontal address from that of the defective pixel may be interpolated. In addition, the smear phenomenon itself and image quality deterioration due to smear correction occur.
[0034]
As described above, the image signal that has undergone smear correction and pixel defect compensation processing is displayed on the LCD image display system 11 or recorded on the memory card 10 through various signal processing as appropriate. The displayed or recorded image is a high-quality image in which smear has been corrected, and thus there is no apparent smear.
[0035]
In addition to the first embodiment, various embodiments can be considered. For example, the present invention is applied to a so-called movie camera (video movie) mainly for moving image shooting. The camera shown in the first embodiment is a so-called digital still camera whose main purpose is still image shooting. Therefore, as long as it is limited to at least one frame shooting of a still image, it can be combined with an optical shutter such as a mechanical shutter. It is conceivable to solve the problem regardless of the present invention. On the other hand, in the case of a movie camera, since movie shooting is mainly performed, there is a general design request that an optical shutter is not used including still image shooting which is an additional function. Becomes even more prominent.
[0036]
In the first embodiment, when the processing of (1) is compared with the processing of (2), the processing of (1) can cope with continuous image output when n-addition driving is performed. There is a problem that the problem remains slightly. On the other hand, the processing of (2) is excellent in image quality, but the best image can be obtained only in the first frame (1 frame at a maximum of 2 frames), so that the movie operation cannot be handled. For normal driving corresponding to n = 1, both (1) and (2) mean the same processing, and do not have the problems as pointed out above. If attention is paid to this, the following several modifications are conceivable.
[0037]
In the first modification, smear correction is not performed in the case of a movie operation during n addition driving. In the first place, in the case of n-addition driving, V transfer is performed n times faster than normal driving, so that smear is reduced to 1 / n compared to normal driving. Therefore, in the first modification, considering that the movie operation at the time of n addition driving is only for display, rather than generating the possibility of new noise generation by the process (1) above, In this example, it is better to choose no correction.
[0038]
The second modification uses the process (2) in the movie operation as well as the still. In this case, a smear having a higher level than that of the other lines described above occurs in a part of the image of the second frame, but this is almost the same as the smear in the case of normal driving in terms of level (same before correction, after correction) (N-1) / n times) and, in terms of area, 12 lines equal to the number of VOB lines including the high luminance point (before addition, but after addition reading, 12 / n lines are obtained). This method can also be adopted when it can be determined that the influence is acceptable. However, since the high-level smear does not occur in the first frame, it should be noted that flicker noise is generated in the movie operation.
[0039]
In the third modified example, the frame rate is compensated by using the buffer memory while using the process (2) in the movie operation as well as the still. That is, the conventional n-addition drive can obtain a rate that is n times that of the normal drive, but even if only the first frame image in the correction process of (2) is used, it is n / 2 times that of the normal drive. Since this is a movie mode image, it is possible to achieve both image quality and image quality. For example, if n = 12, a movie image having a frame rate of 6 times is obtained. If the buffer memory is the digital process circuit 8 itself, a new configuration is not necessary.
[0040]
Here, in the embodiment and each modification described above, the use form of the image after smear correction is recorded or displayed and used for the monitor function (electronic viewfinder). Of course, it can be used for any purpose. Examples of such usage include, for example, automatic adjustment of various signal processing represented by automatic gain control (Automatic Gain Control), automatic white balance adjustment (Automatic White Balancing), automatic exposure, and automatic focusing. As a specific application example, it is used as information in various automatic control functions such as (Automatic Focusing) and an automatic image stabilizer (Automatic Image Stabilizer).
[0041]
Although the embodiments of the present invention and the modifications thereof have been specifically shown above, the present invention is not limited to these, and it can take any form as long as it is described in the claims. Needless to say.
[0042]
【The invention's effect】
As described above based on the embodiments, according to the present invention, even when special driving such as line addition reading of an imaging signal is performed, correct smear correction is performed and image quality deterioration can be prevented. An imaging device can be realized. In particular, according to the first aspect of the present invention, since the correction reference signal is generated in correspondence with the moving image capturing mode and the still image capturing mode, appropriate smear correction is performed for each imaging mode. Even in the case of using addition reading (n-addition driving) intended to shorten the reading time, it is possible to realize an imaging apparatus that does not cause a smear correction problem during still image shooting. Claim 2 According to the present invention, it is possible to minimize a smear correction defect that occurs in the moving image capturing mode using the addition readout intended to shorten the readout time.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing an overall configuration of a digital camera according to an embodiment of an imaging apparatus according to the present invention.
FIG. 2 is a schematic diagram showing a sensor area of the CCD image sensor in the embodiment shown in FIG. 1;
[Explanation of symbols]
1 Lens system
2 Lens drive mechanism
3 Exposure control mechanism
4 Filter system
5 CCD image sensor
6 CCD driver
7 Preprocess circuit
8 Digital process circuit
8-1 Correction reference signal generator
8-2 Image signal correction unit
9 Memory card interface
10 Memory card
11 LCD image display system
12 System controller
13 Operation switch system
14 Operation display system
15 Strobe
16 Lens driver
17 Exposure control driver
18 EEPROM
101 Horizontal transfer path (horizontal shift register)
EP Effective pixel part (imaging area)
OB Optical black pixel part
VOB vertical OB
HOB Horizontal OB
DB dummy bit

Claims (2)

  In order to correct an effective image signal that is an output signal in the frame period of the effective pixel portion of the image sensor from an output signal in the frame period of the CCD image sensor and the optical black pixel portion in the vertical direction of the CCD image sensor In-frame smear correction reference signal generation means for generating a reference signal of the image, image signal correction means for subtracting the correction reference signal from the effective image signal, and driving the image sensor to read out the pixel charge as an output signal As a readout method, each pixel charge of the image sensor can be read out individually or by adding a predetermined number n (n is an integer of 2 or more) in the vertical direction, and has a plurality of readout modes related to this readout method. One of the plurality of readout modes of the image sensor driving means is an effective pixel of the image sensor. And a moving image pickup mode for reading out the pixel charges of the optical black pixel portion in the vertical direction by adding a predetermined number n (n is an integer of 2 or more) in the vertical direction, and the other is the image pickup device. Each pixel charge of the effective pixel portion is read out by adding a predetermined number n (n is an integer of 2 or more) in the vertical direction, and when reading the optical black pixel portion in the vertical direction, each pixel is read for each frame. An image pickup apparatus, wherein the image pickup apparatus is in a still image pickup mode for switching between individual charge readout and addition reading of the predetermined number n.   2. The imaging apparatus according to claim 1, wherein correction by the image signal correction unit is not performed in the moving image imaging mode.

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