JP5404006B2 - Imaging device - Google Patents

Description

  The present invention relates to an image pickup apparatus using an image pickup element that mixes and reads signals from a plurality of pixels.

  In recent years, in imaging devices such as consumer digital cameras and digital video cameras, the number of mounted imaging elements is increasing. When an image sensor with a large number of pixels is used, the image sensor must be driven at a high speed when signals are read from all the pixels on the image sensor within a predetermined time. The load on is increased.

  In order to avoid this, conventionally, the load of signal readout from the image sensor has been reduced by a method of cutting out and reading out a signal in a partial region of the image sensor, or a method of thinning out and reading out signals every plural lines.

  However, with such a method, there are problems that all the pixels on the image sensor cannot be used and image quality deteriorates due to aliasing caused by the thinning process.

  Therefore, in order to drive a multi-pixel image sensor at the same driving speed as before while suppressing image quality degradation compared to when cutting out or thinning out, the number of signal lines to be read by adding image signals on the image sensor is reduced. A technique has been proposed.

For example, Patent Document 1 discloses a technique of reading pixels in which color filters of the same color are arranged in a plurality of vertical transfer units in an image sensor with a primary color Bayer array and adding the read signal charges in an oblique direction. Proposed.
JP2007-088843A

  However, the above conventional technique has a problem that the resolution is deteriorated because the distance between the pixels to be added is long.

  An object of the present invention is to provide an imaging apparatus capable of reducing deterioration in resolution.

In order to achieve the above object, the imaging device according to claim 1 , wherein the plurality of color filters are arranged such that at least one of the plurality of color filters is not adjacent to the same color filter. Regularly two-dimensionally arranged image sensors, reading means for adding and reading signals of a plurality of pixels in which color filters of the same color are arranged on the image sensor, and phase of signals read from the image sensor Phase compensation means for performing compensation, and the readout means adds and reads out the pixel having the shortest distance between the pixels for each color of the color filter, and the phase compensation means reads out each color of the color filter. The phase compensation is performed differently.

  In the image pickup apparatus of the present invention, when the signals of a plurality of pixels in which color filters of the same color are arranged on the image sensor are added and read, the pixel having the shortest distance between the pixels is added for each color of the color filter. Thus, by performing readout and performing different phase compensation for each color, it is possible to reduce degradation in resolution.

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

(First embodiment)
FIG. 1 is a block diagram illustrating a first configuration example of an imaging apparatus according to the present invention.

  FIG. 1 shows a video camera as an imaging device. This video camera includes an imaging lens 101 and a CMOS image sensor 102 including a primary color Bayer array color filter.

  The video camera also includes an AD converter (hereinafter abbreviated as ADC) 103 that converts an analog video signal read from the CMOS image sensor 102 into digital data, and a synchronization signal generation circuit (hereinafter abbreviated as SSG) 104. .

  The video camera also includes a CPU 105 that controls the operation of the entire video camera, a phase compensation unit 106 that performs phase compensation on a video signal output from the ADC 103, a camera signal processing unit 107, and a video signal output terminal 108.

  Here, the CMOS image sensor 102 functions as an image sensor in which a plurality of color filters are regularly arranged in a two-dimensional manner.

  The SSG 104 and the CPU 105 function as a reading unit that adds and reads signals from a plurality of pixels in which color filters of the same color are arranged on the image sensor. The phase compensation unit 106 functions as a phase compensation unit that performs phase compensation of a signal read from the image sensor.

  Then, the reading unit adds and reads out the pixel having the shortest distance between the pixels for each color of the color filter, and the phase compensation unit performs different phase compensation for each color of the color filter.

  Further, when the reading unit adds and reads the signals of a plurality of pixels in which color filters of the same color are arranged on the image sensor, the pixel centroid after the addition is offset sampling for at least one type of color filter. The pixel to be added is selected.

  Details of these will be described later.

  As described above, this video camera uses the CMOS image sensor 102 including the color filters of the primary color Bayer array. In an XY address type solid-state imaging device represented by the CMOS image sensor 102, the design flexibility of the readout circuit can be increased.

  Therefore, in the present embodiment, on the CMOS image sensor 102, an operation of adding and reading two pixels each having the same color filter arranged so that the inter-pixel distance is the shortest for each color is performed.

  Next, an outline of the operation of the video camera will be described.

  When an optical image is formed on the light receiving surface of the CMOS image sensor 102 through the imaging lens 101, photocharges corresponding to the amount of incident light are generated by the photodiodes arranged in the respective pixels of the CMOS image sensor 102.

  In the SSG 104, a synchronization signal for driving the CMOS image sensor 102 is generated, and an internal drive circuit of the CMOS image sensor 102 is driven based on the synchronization signal and a control signal from the CPU 105. Then, a video signal is output from the output terminal of the CMOS image sensor 102 in a predetermined order.

  The video signal is converted into digital data by the ADC 103. The output signal (video signal) of the ADC 103 is subjected to phase compensation by the phase compensation unit 106 and then input to the camera signal processing circuit 107.

  In the camera signal processing circuit 107, signal processing such as generation of luminance signal, color difference signal, and contour compensation is performed on the video signal, and the video signal is output from the video signal output terminal 108.

  Next, a process of adding and reading two pixels of the same color on the CMOS image sensor 102 will be described with reference to the conceptual diagram of FIG.

  As shown in FIG. 21, the color filters of the primary color Bayer array arranged in the CMOS image sensor 102 are arranged in a checkered pattern, and arranged in a square lattice pattern in R and B. Therefore, for the pixels in which the G color filter is arranged, the distance between the pixels is the shortest in the oblique direction, and in the pixels in which the R and B color filters are arranged, the distance between the pixels in the vertical and horizontal directions is the shortest. .

  In the present invention, when pixels of the same color are added and read, the pixels to be added are selected so that the distance between the pixels to be added is the shortest, thereby reducing resolution degradation due to the addition. Therefore, for G, two pixels of the same color that are adjacent in the diagonal direction are added, and for R and B, two pixels of the same color that are located two pixels apart in the vertical direction are added.

  Specifically, in FIG. 2, G exists in the L (2n) and L (2n + 1) rows and is read by adding two pixels of G adjacent in the oblique direction. For R, the R pixels in the L (2n) row and the L (2n + 2) row are added and read in the vertical direction. In B, the B pixels in the L (2n + 1) row and the L (2n + 3) row are added in the vertical direction and read out.

  For G, the combination of pixels to be added is changed for each row so that the pixel arrangement after the addition becomes a checkered pattern. For example, in FIG. 2, the G pixels in the L (0) row and the L (1) row are added in a 45-degree direction, and then the G pixels in the L (2) row and the L (3) row are added. Pixels are added obliquely in the direction of 135 degrees.

  As described above, when pixels of the same color are added and read, the distance between the added pixels is the shortest for each of R, G, and B, and the pixel arrangement after the addition is Ichimatsu for G. And R and B are arranged in a square lattice pattern. However, the center of gravity of the pixel after the addition reading is as shown in FIG. 3, and the arrangement of the R, G, and B pixel centroids is not a primary color Bayer array.

  Therefore, the phase compensation unit 106 performs phase compensation processing. As described above, with respect to G, since the pixel arrangement after addition is checkered, the center of gravity of the R and B pixels is indicated by the arrows in FIG. 3 with reference to the G pixel. Phase compensation is performed so as to obtain the position. As specific processing for phase compensation, for example, interpolation using pixels of the same color is performed.

  In the phase compensation unit 106, the centroids of the R, G, and B pixels after the phase compensation processing is performed on the R and B pixels are as shown in FIG.

  As described above, in this embodiment, when adding and reading signals of two pixels in which color filters of the same color are arranged on the CMOS image sensor 102, the distance between the added pixels is the largest for each color. The addition pixel is selected so as to be shortened. Thereby, resolution degradation due to addition can be reduced.

  In addition, the phase compensation process is performed only on the R and B signals of the image read out from the CMOS image sensor 102, and the phase compensation process is not performed on the G signal that contributes most to the resolution. Resolution degradation due to compensation processing can be reduced.

  Thereby, in an imaging apparatus using a multi-pixel image sensor, it is possible to reduce the processing load while suppressing image quality deterioration.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The configuration of the second embodiment is the same as that of the first embodiment shown in FIG.

  In the present embodiment, on the CMOS image sensor 102, an operation of adding and reading three pixels each having the same color filter arranged so that the distance between the pixels is the shortest for each color is performed.

  The difference between the second embodiment and the first embodiment is the addition reading operation in the CMOS image sensor 102 and the phase compensation processing operation in the phase compensation unit 106. Only the differences will be described, and the description of the rest will be omitted.

  A process of adding and reading three pixels of the same color on the CMOS image sensor 102 will be described with reference to the conceptual diagram of FIG.

  In the present invention, when pixels of the same color are added and read out, by selecting the pixels to be added so that the distance between the pixels to be added is the shortest, resolution degradation due to the addition can be reduced. Three pixels of the same color adjacent in the oblique direction are added. For R and B, three pixels of the same color that are located two pixels apart in the vertical direction are added.

  Specifically, in FIG. 5, for G, three pixels that are present in the L (2n), L (2n + 1), and L (2n + 2) rows and that are adjacent in the oblique direction are Added and read. For R, the R pixels in the L (2n), L (2n + 2), and L (2n + 4) rows are added in the vertical direction and read out. For B, the B pixels in the L (2n-1), L (2n + 1), and L (2n + 3) rows are added in the vertical direction and read (n = 0, 1, 2, ...).

  As described above, for each of R, G, and B, a pixel to be added is selected so that the distance between the pixels becomes the shortest, and when the pixel is added and read on the CMOS image sensor 102, the center of gravity of the pixel after reading is as shown in FIG. become.

  In FIG. 6, the pixel centroids of G are checkered, but the pixel centroids of R and B are deviated from G and are not primary color Bayer arrays.

  Therefore, the phase compensation unit 106 performs phase compensation so that the R and B pixel centroids are respectively located at the pixel positions indicated by arrows in FIG. As specific processing for phase compensation, for example, interpolation using pixels of the same color is performed.

  In the phase compensation unit 106, the centroids of the R, G, and B pixels after the phase compensation process is performed on the R and B pixels are as shown in FIG.

  As described above, in this embodiment, when adding and reading out signals of three pixels in which color filters of the same color are arranged on the CMOS image sensor 102, the distance between the added pixels is the largest for each color. The addition pixel is selected so as to be shortened. Thereby, resolution degradation due to addition can be reduced.

  In addition, the phase compensation process is performed only on the R and B signals of the image read out from the CMOS image sensor 102, and the phase compensation process is not performed on the G signal that contributes most to the resolution. Resolution degradation due to compensation processing can be reduced.

  Thereby, in an imaging apparatus using a multi-pixel image sensor, it is possible to reduce the processing load while suppressing image quality deterioration.

(Third embodiment)
Next, a third embodiment of the present invention will be described. Since the configuration of the third embodiment is the same as that of the first embodiment shown in FIG.

  In the present embodiment, on the CMOS image sensor 102, an operation of adding and reading out four pixels each having the same color filter arranged so that the distance between the pixels is the shortest for each color is performed.

  The difference between the third embodiment and the first embodiment is the addition reading operation in the CMOS image sensor 102 and the phase compensation processing operation in the phase compensation unit 106. Only the differences will be described, and the description of the rest will be omitted.

  A process of adding and reading four pixels of the same color on the CMOS image sensor 102 will be described with reference to the conceptual diagram of FIG.

  FIGS. 8A, 8B, and 8C are conceptual diagrams that display only pixels in which G, R, and B color filters are arranged from the primary color Bayer array CMOS image sensor 102 shown in FIG. 21, respectively. It is.

  In the present invention, when pixels of the same color are added and read out, by selecting the pixels to be added so that the distance between the pixels to be added is the shortest, resolution degradation due to the addition can be reduced. Four pixels of the same color adjacent in the oblique direction are added. For R and B, four pixels of the same color that are located two pixels apart in the vertical direction are added.

  For the G pixel shown in FIG. 8A, four pixels adjacent in the diagonal direction included in the hatched area are added and read. With respect to the R pixel shown in FIG. 8B, four pixels included in the hatched area and located two pixels apart in the vertical and horizontal directions are added and read. Similarly, for the pixel B shown in FIG. 8C, four pixels located in the hatched area and positioned two pixels apart in the vertical and horizontal directions are added and read.

  As described above, for each of R, G, and B, a pixel to be added is selected so that the distance between the pixels becomes the shortest, and when added and read on the CMOS image sensor 102, the center of gravity of the pixel after reading is as shown in FIG. become.

  In FIG. 9, the center of gravity of the G pixel is checkered, but the center of gravity of the R and B pixels is deviated from G and is not a primary color Bayer array.

  Therefore, the phase compensation unit 106 performs phase compensation so that the R and B pixel centroids are respectively located at the pixel positions indicated by arrows in FIG. As specific processing for phase compensation, for example, interpolation using pixels of the same color is performed.

  In the phase compensation unit 106, the centroids of the R, G, and B pixels after the phase compensation process is performed on the R and B pixels are as shown in FIG.

  As described above, in the present embodiment, when signals of four pixels in which color filters of the same color are arranged are added and read on the CMOS image sensor 102, the distance between the added pixels is the largest for each color. The addition pixel is selected so as to be shortened. Thereby, resolution degradation due to addition can be reduced.

  In addition, the phase compensation process is performed only on the R and B signals of the image read out from the CMOS image sensor 102, and the phase compensation process is not performed on the G signal that contributes most to the resolution. Resolution degradation due to compensation processing can be reduced.

  Thereby, in an imaging apparatus using a multi-pixel image sensor, it is possible to reduce the processing load while suppressing image quality deterioration.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. The configuration of the fourth embodiment is the same as that of the first embodiment shown in FIG.

  In the present embodiment, on the CMOS image sensor 102, an operation of adding and reading out pixels each having a color filter of the same color added by 6 pixels so that the distance between pixels is the shortest for each color is performed.

  The difference between the fourth embodiment and the first embodiment is the addition reading operation in the CMOS image sensor 102 and the phase compensation processing operation in the phase compensation unit 106. Only the differences will be described, and the description of the rest will be omitted.

  A process of adding and reading six pixels of the same color on the CMOS image sensor 102 will be described with reference to the conceptual diagram of FIG.

  FIGS. 11A, 11B, and 11C are conceptual diagrams that display only pixels in which G, R, and B color filters are arranged, respectively, from the primary color Bayer array CMOS image sensor 102 shown in FIG. It is.

  In the present invention, when pixels of the same color are added and read out, by selecting the pixels to be added so that the distance between the pixels to be added is the shortest, resolution degradation due to the addition can be reduced. Six pixels of the same color adjacent in the oblique direction are added. For R and B, 6 pixels of the same color located 2 pixels apart in the vertical direction are added.

  With respect to the G pixel shown in FIG. 11A, 6 pixels adjacent to each other in the oblique direction included in the shaded area are added and read. With respect to the R pixel shown in FIG. 11B, six pixels located two pixels apart in the vertical and horizontal directions included in the hatched area are added and read. Similarly, with respect to the pixel B shown in FIG. 11C, 6 pixels included in the hatched area and located two pixels apart in the vertical and horizontal directions are added and read.

  As described above, for each of R, G, and B, the pixel to be added is selected so that the distance between the pixels is the shortest, and when added and read on the CMOS image sensor 102, the center of gravity of the pixel after reading is as shown in FIG. become.

  In FIG. 12, the pixel centroids of G are in a checkered pattern, but the R and B pixel centroids are shifted from G, and the primary color Bayer array is not formed.

  Therefore, the phase compensation unit 106 performs phase compensation so that the R and B pixel centroids are respectively located at pixel positions indicated by arrows in FIG. As specific processing for phase compensation, for example, interpolation using pixels of the same color is performed.

  In the phase compensation unit 106, the centroids of the R, G, and B pixels after the phase compensation process is performed on the R and B pixels are as shown in FIG.

  As described above, in the present embodiment, when signals of 6 pixels in which color filters of the same color are arranged are added and read on the CMOS image sensor 102, the distance between the added pixels is the largest for each color. The addition pixel is selected so as to be shortened. Thereby, resolution degradation due to addition can be reduced.

  In addition, the phase compensation process is performed only on the R and B signals of the image read out from the CMOS image sensor 102, and the phase compensation process is not performed on the G signal that contributes most to the resolution. Resolution degradation due to compensation processing can be reduced.

  Thereby, in an imaging apparatus using a multi-pixel image sensor, it is possible to reduce the processing load while suppressing image quality deterioration.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.

  FIG. 14 is a block diagram illustrating a second configuration example of the imaging apparatus according to the present invention.

  The configuration of the fifth embodiment is as shown in FIG. 14, and a frame memory 109 and an IP conversion unit 110 are added to the first embodiment shown in FIG.

  In the fifth embodiment, unlike the first embodiment, addition reading is performed by the CMOS image sensor 102 so that the pixel centroid after the addition is shifted for each field. Also, in the fifth embodiment, unlike the first embodiment, images for two fields having different pixel centroids are framed by the IP conversion unit 110 and output via the frame memory 109.

  In the following, only the above differences will be described, and description of other parts will be omitted.

  In the present embodiment, the phase of addition reading from the CMOS image sensor 102 is changed for each field. In the case of an odd field, addition reading is performed in the same manner as in the first embodiment, and thus description thereof is omitted.

  In the even field, the R, G, and B addition pixels are switched so that the phase after readout is shifted up by one line compared to that in the odd field.

  Specifically, in the case of an even field, as shown in FIG. 15, G is present in the L (2n-1) and L (2n) rows, and two adjacent G pixels in the diagonal direction are added. And read. For R, the R pixels in the L (2n−2) th row and the L (2n) th row are added in the vertical direction and read out. With respect to B, the B pixels in the L (2n-1) and L (2n + 1) rows are added and read in the vertical direction, and the center of gravity of the pixel after the addition reading is as shown in FIG. Become.

  In FIG. 16, the pixel centroids of G are checkered, but the R and B pixel centroids are shifted from G, and the primary color Bayer array is not formed.

  Therefore, the phase compensation unit 106 performs phase compensation so that the R and B pixel centroids are respectively located at the pixel positions indicated by arrows in FIG. As specific processing for phase compensation, for example, interpolation using pixels of the same color is performed.

  In the phase compensation unit 106, the centroids of the R, G, and B pixels after the phase compensation processing is performed on the R and B pixels are as shown in FIG.

  Further, the center of gravity of the pixels in the vertical direction of the even field shown in FIG. 17 is located at L2 (2n). On the other hand, the center of gravity of the pixel after the phase compensation processing in the odd field is located at L2 (2n + 1) as shown in FIG. 4, and the center of gravity of the pixel in the vertical direction of the even field and the odd field is interlaced. It becomes.

  In the frame memory 109, the video signal output from the camera signal processing unit 107 is delayed by one field. The IP conversion unit 110 generates a frame image by interpolation processing using the video signal of the current field output from the camera signal processing unit 107 and the video signal of the previous field delayed by the frame memory 109.

  As described above, in the present embodiment, signals of two pixels in which color filters of the same color are arranged on the CMOS image sensor 102 are added, and the combination of pixels to be added is changed for each field, so that Make the image interlaced.

  At this time, by selecting the addition pixel so that the distance between the pixels to be added is the shortest for each color, it is possible to reduce resolution degradation due to the addition.

  In addition, the phase compensation process is performed only on the R and B signals of the image read out from the CMOS image sensor 102, and the phase compensation process is not performed on the G signal that contributes most to the resolution. Resolution degradation due to compensation processing can be reduced.

  Thereby, in an imaging apparatus using a multi-pixel image sensor, it is possible to reduce the processing load while suppressing image quality deterioration.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. The configuration of the sixth embodiment is the same as that of the first embodiment shown in FIG.

  In the sixth embodiment, unlike the first embodiment, the CMOS image sensor 102 has a primary color honeycomb arrangement as shown in FIG.

  In the following, only the above differences will be described, and description of other parts will be omitted.

  A process of adding and reading two pixels of the same color on the primary color honeycomb array CMOS image sensor 102 will be described with reference to FIG.

  18A shows only G pixels for the primary color honeycomb array CMOS image sensor 102, and FIG. 18B shows only R and B pixels for the primary color honeycomb array CMOS image sensor 102. doing.

  As shown in FIG. 22, the color filters of the primary color honeycomb array arranged in the CMOS image sensor 102 are arranged in a square lattice pattern of G, and R and B are arranged in a diagonal direction with respect to the position of G pixels. It is arranged in a checkered pattern at a position shifted by 0.5 pixels.

  Therefore, for the pixels in which the G color filter is arranged, the distance between the pixels is the shortest in the vertical and horizontal directions, and in the pixels in which the R and B color filters are arranged, the distance between the pixels in the oblique direction is the shortest. .

  In the present invention, when pixels of the same color are added and read out, by selecting the pixels to be added so that the distance between the pixels to be added is the shortest, resolution degradation due to the addition can be reduced. Two G pixels adjacent in the vertical direction are added. For R and B, two pixels of the same color adjacent in the diagonal direction are added.

  Specifically, in FIG. 18, G exists in the L (2n) and L (2n + 2) rows, and two pixels of G adjacent in the vertical direction are added and read. R exists in the L (2n + 1) and L (2n + 3) rows, and R pixels adjacent in the diagonal direction are added and read. B exists in the L (2n + 1) and L (2n + 3) rows, and B pixels adjacent in the oblique direction are added and read. For R and B, the combination of pixels to be added is changed for each row so that the pixel arrangement after the addition becomes a checkered pattern.

  For example, as shown in FIG. 18B, when adding R and B in the diagonal direction, pixels of the same color in the L (1) row and the L (3) row are added in the 45 ° diagonal direction. Thereafter, the pixels of the same color in the L (5) line and the L (7) line are added in a diagonal direction of 135 degrees.

  When pixel addition of the same color is performed as described above, the distance between the pixels to be added is the shortest for each of R, G, and B, and the pixel arrangement after the addition is a square lattice for G. About R and B, it becomes a checkered pattern.

  However, as shown in FIG. 19, the center of gravity of the pixel after readout is such that the positional relationship of the R, G, and B pixel centroids is not the primary color honeycomb.

  Therefore, the phase compensation unit 106 performs phase compensation so that the R and B pixel centroids are respectively located at the pixel positions indicated by arrows in FIG. As specific processing for phase compensation, for example, interpolation using pixels of the same color is performed.

  In the phase compensation unit 106, the center of gravity of the R, G, and B pixels after the phase compensation processing is performed on the R and B pixels is as shown in FIG.

  Further, as described above, since the R and B pixels are controlled so that the pixel arrangement after sensor reading is in a checkered pattern, the compensation amount of phase compensation for R and B is as shown in FIG. The pixel position is uniform regardless of the color of the color filter. As a result, it is possible to prevent image quality degradation due to uneven pixel phase compensation.

  As described above, in this embodiment, when adding and reading signals of two pixels in which color filters of the same color are arranged on the CMOS image sensor 102, the distance between the added pixels is the largest for each color. The addition pixel is selected so as to be shortened. Thereby, resolution degradation due to addition can be reduced.

  In addition, regarding the R and B pixels, when adding and reading out pixels of the same color in an oblique direction, the combination of pixels to be added is changed for each row so that the pixel arrangement after the addition becomes a checkered pattern. Therefore, in the subsequent phase compensation processing, the level of phase compensation for R and B becomes uniform, and image quality deterioration due to compensation unevenness for each pixel can be avoided.

  In addition, the phase compensation process is performed only on the R and B signals of the image read out from the CMOS image sensor 102, and the phase compensation process is not performed on the G signal that contributes most to the resolution. Resolution degradation due to compensation processing can be reduced.

  Thereby, in an imaging apparatus using a multi-pixel image sensor, it is possible to reduce the processing load while suppressing image quality deterioration.

It is a block diagram showing the 1st example of composition of the imaging device concerning the present invention. FIG. 2 is a conceptual diagram of pixel addition according to the first embodiment in the CMOS image sensor of FIG. 1. FIG. 2 is a conceptual diagram after pixel addition of the first embodiment in the CMOS image sensor of FIG. 1. It is a conceptual diagram after the phase compensation of 1st Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram of the pixel addition of 2nd Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram after pixel addition of the second embodiment in the CMOS image sensor of FIG. FIG. 5 is a conceptual diagram after phase compensation of the second embodiment in the CMOS image sensor of FIG. 1. It is a conceptual diagram of the pixel addition of 3rd Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram after pixel addition of the third embodiment in the CMOS image sensor of FIG. FIG. 7 is a conceptual diagram after phase compensation of the third embodiment in the CMOS image sensor of FIG. 1. It is a conceptual diagram of the pixel addition of 4th Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram after the pixel addition of 4th Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram after phase compensation of the fourth embodiment in the CMOS image sensor of FIG. It is a block diagram which shows the 2nd structural example of the imaging device which concerns on this invention. It is a conceptual diagram of the pixel addition of 5th Embodiment in the CMOS image sensor of FIG. FIG. 10 is a conceptual diagram after pixel addition in the fifth embodiment in the CMOS image sensor of FIG. 1. It is a conceptual diagram after the phase compensation of 5th Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram of the pixel addition of 6th Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram after the pixel addition of 6th Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram after the phase compensation of 6th Embodiment in the CMOS image sensor of FIG. It is a conceptual diagram of a primary color Bayer arrangement in a CMOS image sensor. It is a conceptual diagram of the primary color honeycomb arrangement in the CMOS image sensor.

Explanation of symbols

101 imaging lens 102 CMOS image sensor 103 ADC
104 SSG
105 CPU
106 phase compensation unit 107 camera signal processing unit 108 video signal output terminal 109 frame memory 110 IP conversion unit

Claims (5)

An image sensor regularly arranged in a two-dimensional manner so that at least one of the color filters of the plurality of colors is not adjacent to the color filter of the same color ;
Reading means for adding and reading signals of a plurality of pixels in which color filters of the same color are arranged on the image sensor;
Phase compensation means for performing phase compensation of the signal read from the image sensor,
The readout means adds and reads out the pixel having the shortest distance between the pixels for each color of the color filter,
The imaging apparatus according to claim 1, wherein the phase compensation unit performs the phase compensation different for each color of the color filter. The phase compensation means does not perform phase compensation of a signal read from the image sensor for a color filter having a shortest distance between pixels to be added among the color filters of the plurality of colors. Item 2. The imaging device according to Item 1. When the reading means adds and reads the signals of the plurality of pixels in which color filters of the same color are arranged on the image sensor, the distance between the pixels to be added among the color filters of the plurality of colors becomes the shortest. 3. The image pickup apparatus according to claim 1, wherein for the color filter, the pixel to be added is selected so that the array pattern of the pixel centroid after the addition is equal to the array pattern of the color filter. 4. The image pickup device according to claim 1, wherein the color filter having the shortest distance between pixels to be added among the plurality of color filters is a G color filter. 5. The imaging apparatus of Claim 1. It said reading means, when adding and reading signals of the plurality of pixels in which the color filters of the same color on the image pickup elements are arranged, and at least one kind of color filter, a pixel centroid after the addition is an offset sampling and so as, imaging apparatus according to any one of claims 1 to 4, characterized in that selecting the pixels to be added.

Images