JP5251323B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus.

Focus detection pixels of the pupil division phase difference detection method are arranged in a part of the image sensor, and the focus detection of the photographing optical system is performed with this focus detection pixel array, and two-dimensionally around the focus detection pixel array There has been known an imaging apparatus that performs imaging with imaging pixels arranged in a Bayer array (see, for example, Patent Document 1).
Japanese Unexamined Patent Publication No. 01-216306

  However, in the above-described conventional imaging device, the image output at the focus detection pixel position must be obtained by interpolation using the pixel outputs of the imaging pixels in the surrounding Bayer array, and therefore at many positions in the shooting screen. In order to perform focus detection in various directions, the more the pixel arrays for focus detection are arranged, the more complicated the interpolation processing becomes, and it takes time to generate an image, and the image quality after the interpolation processing deteriorates. is there.

(1) According to the first aspect of the present invention, the light beam dividing means for dividing the light beam transmitted through the imaging optical system into a first light beam having a predetermined color component and a second light beam having a color component other than the predetermined color component. And two-dimensionally array imaging pixels for capturing a subject image formed by the imaging optical system, and detect the focus adjustment state of the imaging optical system in a part of the two-dimensional array. An imaging pixel having a first pixel for receiving a first light beam and a plurality of color filters other than a predetermined color, which are connected by an imaging optical system. A pixel array for focus detection for detecting the focus adjustment state of the imaging optical system is arranged in a part of the two-dimensional array, as well as two-dimensionally arraying imaging pixels for capturing a subject image to be imaged. A second imaging element that receives the second light beam and a focus detection pixel are arranged The image output at the selected pixel position is interpolated based on the output of the imaging pixels around the focus detection pixel, and the subject image is generated based on the output of the first imaging element and the output of the second imaging element Image generating means.
(2) The invention according to claim 2 is an image pickup pixel having a light beam splitting unit that splits a light beam that has passed through the imaging optical system into a first light beam and a second light beam that are different from each other, and a color filter of a predetermined color. The imaging pixels for imaging the subject image formed by the imaging optical system are arranged two-dimensionally, and the focus adjustment state of the imaging optical system is partially set in the two-dimensional arrangement. An imaging pixel having a focus detection pixel array for detection and having a first image sensor that receives a first light beam and a plurality of color filters other than a predetermined color Focusing pixels for detecting the focus adjustment state of the imaging optical system in a part of the two-dimensional array while arranging the imaging pixels for capturing the subject image formed by the A second imaging device that provides an array and receives the second light flux The image output at the pixel position where the focus detection pixel is arranged is interpolated based on the output of the imaging pixels around the focus detection pixel, and the output of the first image sensor and the output of the second image sensor And image generation means for generating a subject image based on the above.
(3) The invention of claim 3 is the imaging apparatus according to claim 1 or 2, wherein the image generation means outputs the image output at the focus detection pixel position on the first imaging element as the first imaging. Calculation is performed by interpolation based on the output of the imaging pixels on the element.
(4) According to a fourth aspect of the present invention, in the imaging apparatus according to any one of the first to third aspects, the image generating means outputs the image output at the focus detection pixel position on the second imaging element. It calculates by interpolation based on the output of the imaging pixel on 2 imaging elements.
(5) According to a fifth aspect of the present invention, in the imaging device according to any one of the first to fourth aspects, the image generating means is arranged along straight lines in a plurality of directions passing through the focus detection pixel positions. The similarity of the output of the imaging pixel is detected, and the image output at the focus detection pixel position is calculated by interpolation based on the output of the imaging pixel arranged on the straight line in the direction in which the output similarity is high.
(6) According to a sixth aspect of the present invention, in the imaging apparatus according to the fifth aspect, the image generating means is arranged in an arrangement direction of the focus detection pixel array on one of the first and second imaging elements. Is calculated based on the output similarity of the imaging pixels arranged in the direction corresponding to the arrangement direction on the other imaging element.
(7) According to a seventh aspect of the present invention, in the imaging apparatus according to any one of the first to sixth aspects, the focus adjustment of the imaging optical system is performed based on the output of the focus detection pixel on the first image sensor. Focus detection means for detecting the state and detecting the focus adjustment state of the imaging optical system based on the output of the focus detection pixel on the second image sensor, and focus detection based on the amount of chromatic aberration of the imaging optical system Chromatic aberration correcting means for correcting the detection result by the means.
(8) According to an eighth aspect of the present invention, in the imaging device according to any one of the first to seventh aspects, the focus detection pixel array is arranged in a direction orthogonal to a radial direction from the center of the photographing screen of the photographing optical system. Arrange along.
(9) The invention of claim 9 is the imaging apparatus according to any one of claims 1 to 8, wherein the imaging pixel receives light from the microlens and the imaging optical system via the microlens. The focus detection pixel has a microlens and a photoelectric conversion element that is arranged eccentrically from the center of the microlens and receives light from the imaging optical system via the microlens. .

(1) According to the first aspect of the present invention, the light beam splitting splits the light beam transmitted through the imaging optical system into a first light beam having a predetermined color component and a second light beam having a color component other than the predetermined color component. And imaging pixels for imaging a subject image imaged by the imaging optical system are arranged in a two-dimensional manner, and the imaging optics along a predetermined direction in a part of the two-dimensional arrangement An imaging pixel provided with a focus detection pixel array for detecting a focus adjustment state of the system, and having a first image sensor that receives the first light beam and a plurality of color filters other than the predetermined color The imaging pixels for imaging the subject image formed by the imaging optical system are two-dimensionally arranged, and a part of the two-dimensional arrangement is arranged in a direction orthogonal to the predetermined direction. focus detection for detecting the focusing state of the imaging optical system along An image output at a pixel position where the focus detection pixel is arranged, and a second image sensor that receives the second light flux, and an image output of the image pickup pixels around the focus detection pixel. And an image generating means for interpolating based on the output and generating a subject image based on the output of the first image sensor and the output of the second image sensor.
(2) According to the invention of claim 2, light beam splitting that splits the light beam transmitted through the imaging optical system into a first light beam having a predetermined color component and a second light beam having a color component other than the predetermined color component. Means and two-dimensionally arranged imaging pixels for imaging a subject image formed by the imaging optical system, and a focus adjustment state of the imaging optical system in a part of the two-dimensional array An imaging pixel having a first imaging element that receives a first light beam and a color filter of a plurality of colors other than the predetermined color; In order to two-dimensionally arrange imaging pixels for imaging a subject image formed by the imaging optical system, and to detect the focus adjustment state of the imaging optical system in a part of the two-dimensional array A focus detection pixel array for receiving the second light flux. An image output and an image output at a pixel position where the focus detection pixel is disposed are interpolated based on an output of the image pickup pixel around the focus detection pixel, and the output of the first image pickup element and the a region of the object image Rutotomoni a image generating means for generating an object image, the focus detection pixel array in the first image sensor receives light based on the output of the second image sensor, the second The focus detection pixel array in the image pickup element has a different arrangement direction from the region of the subject image received .
(3) According to a third aspect of the present invention, in the imaging apparatus according to the first or second aspect, the region of the subject image received by the focus detection pixel array in the first imaging element and the second imaging element The focus detection pixel array in FIG. 4 intersects the region of the subject image received by the light.
(4) According to a fourth aspect of the present invention, there is provided an imaging pixel having a light beam dividing means for dividing a light beam transmitted through the imaging optical system into a first light beam and a second light beam different from each other, and a color filter of a predetermined color. The imaging pixels for imaging the subject image formed by the imaging optical system are arranged two-dimensionally, and the imaging is performed along a predetermined direction in a part of the two-dimensional arrangement A focus detection pixel array for detecting a focus adjustment state of the optical system is provided, and includes a first image sensor that receives the first light beam, and a plurality of color filters other than the predetermined color. A pixel, in which two or more imaging pixels for imaging a subject image formed by the imaging optical system are arranged in a two-dimensional manner, and a direction orthogonal to the predetermined direction is partially in the two-dimensional arrangement The focus adjustment state of the imaging optical system along A focus detection pixel array for outputting the second image sensor that receives the second light flux; and an image output at a pixel position where the focus detection pixel is arranged, around the focus detection pixel. And an image generation means for generating a subject image based on the output of the first image sensor and the output of the second image sensor. .
(5) The invention according to claim 5 is the imaging apparatus according to any one of claims 1 to 4, wherein the image generation unit outputs an image at the focus detection pixel position on the first imaging element. Is calculated by interpolation based on the output of the imaging pixels on the first imaging device.
(6) The invention of claim 6 is the imaging apparatus according to any one of claims 1 to 4, wherein the image generating means outputs an image at the focus detection pixel position on the second imaging element. Is calculated by interpolation based on the output of the imaging pixels on the second imaging element.
(7) According to a seventh aspect of the present invention, in the imaging device according to any one of the first to sixth aspects, the image generating means is arranged along a plurality of directions of straight lines passing through the focus detection pixel positions. The output similarity of the adjacent imaging pixels is detected, and the image output at the focus detection pixel position is interpolated based on the output of the imaging pixels arranged on a straight line in the direction in which the output similarity is high. It is characterized by calculating.
(8) According to an eighth aspect of the present invention, in the imaging apparatus according to the seventh aspect, the image generation means is the focus detection pixel on one of the first and second imaging elements. The output similarity of the imaging pixels in the arrangement direction of the arrangement is calculated based on the output similarity of the imaging pixels arranged in a direction corresponding to the arrangement direction on the other imaging element.
(9) According to a ninth aspect of the present invention, in the imaging apparatus according to any one of the first to eighth aspects, the imaging optical system is based on an output of the focus detection pixel on the first imaging element. A focus detection unit that detects a focus adjustment state of the imaging optical system based on an output of the focus detection pixel on the second image sensor, and Chromatic aberration correction means for correcting the detection result by the focus detection means based on the amount of chromatic aberration.
(10) The invention of claim 10 is the imaging apparatus according to any one of claims 1 to 9, wherein the focus detection pixel array is orthogonal to a radiation direction from the center of the imaging screen of the imaging optical system. It arrange | positions along a direction, It is characterized by the above-mentioned.
(11) According to an eleventh aspect of the present invention, in the imaging apparatus according to any one of the first to tenth aspects, the imaging pixel includes a microlens and light from the imaging optical system. The focus detection pixels are arranged eccentrically from the center of the microlens, and receive light from the imaging optical system via the microlens. And a photoelectric conversion element.

  FIG. 1 shows the configuration of an embodiment. A digital camera 201 according to an embodiment includes an interchangeable lens 202 and a camera body 203, and the interchangeable lens 202 is attached to the camera body 203 via a mount unit 204.

  The interchangeable lens 202 includes a lens drive control device 206, a zooming lens 208, a lens 209, a focusing lens 210, a diaphragm 211, and the like. The lens drive control device 206 includes peripheral components such as a microcomputer and a memory, and controls the driving of the focusing lens 210 and the aperture 211, detects the states of the zooming lens 208, the focusing lens 210 and the aperture 211, and a body drive control device 214 which will be described later. The lens information is transmitted and the camera information is received by the communication.

  On the other hand, the camera body 203 includes a body drive control device 214, a liquid crystal display device drive circuit 215, a liquid crystal display device 216, a memory card 219, a first imaging device 220, a second imaging device 221, a wavelength selective half mirror 223, and the like. Yes. The wavelength-selective half mirror 223 includes a wavelength-selective half mirror surface 222 that transmits the green G component of the light beam coming from the interchangeable lens 202 and reflects other components. An infrared cut filter 224 is provided on the light incident side of the wavelength selective half mirror 223.

  The first image sensor 220 is a solid-state image sensor that receives the green G component light beam that has passed through the wavelength-selective half mirror 223, and is disposed on the planned imaging plane (imaging plane) of the interchangeable lens 202. On the other hand, the second image sensor 221 is a solid-state image sensor that receives a light beam of a component other than green G reflected from the wavelength selective half mirror 223, and is disposed on another scheduled imaging surface (imaging surface) of the interchangeable lens 202. Is done. In FIG. 1, “A” of the first image sensor 220 and the second image sensor 221 corresponds to the “heaven” side of the object scene, and “B” corresponds to the “ground” side of the object field. Note that the imaging surface (scheduled imaging surface) of the first imaging element 220 and the imaging surface (scheduled imaging surface) of the second imaging element 221 are in a conjugate relationship with each other. The first image sensor 220 and the second image sensor 221 are configured by a CCD, a CMOS, or the like.

  The body drive control unit 214 includes a microcomputer and peripheral components such as a memory, reads and corrects image signals from the first image sensor 220 and the second image sensor 221, and communicates with the lens drive control unit 206 (for lens information). Reception, transmission of camera information such as defocus amount), detection of the focus adjustment state (defocus amount) of the interchangeable lens 202, and operation control of the entire camera. The body drive control device 214 and the lens drive control device 206 communicate via an electrical contact 213 provided in the mount unit 204 to exchange various information such as lens information, defocus amount, and aperture information.

  In the camera of this embodiment, the liquid crystal display element driving circuit 215 and the liquid crystal display element 216 constitute an EVF (Electric View Finder), and images captured by the first image sensor 220 and the second image sensor 221 are displayed on the liquid crystal display element 216. To the photographer through the eyepiece 217. The captured image is recorded in the memory card 219.

  The first imaging element 220 and the second imaging element 221 have imaging pixels arranged two-dimensionally, and a focus detection pixel array is incorporated in a portion corresponding to the focus detection position. The subject image formed on the first image sensor 220 and the second image sensor 221 by the light beam transmitted through the interchangeable lens 202 and divided by the wavelength selective half mirror 223 is the first image sensor 220 and the second image sensor 221. Are subjected to photoelectric conversion, and their outputs are sent to the body drive control device 214.

  The body drive control device 214 calculates a defocus amount at the focus detection position based on the output of the focus detection pixel, and sends this defocus amount to the lens drive control device 206. In addition, the body drive control device 214 stores the image signal generated based on the output of the imaging pixel in the memory card 219, sends the image signal to the liquid crystal display element drive circuit 215, and displays the image signal on the liquid crystal display element 216. Let Further, the body drive control device 214 sends aperture control information to the lens drive control device 206 to control the size of the aperture opening.

  The lens drive control device 206 updates the lens information according to the focusing state, zooming state, aperture setting state, aperture opening F value, and the like. Specifically, the lens drive control device 206 monitors the positions of the zooming lens 208 and the focusing lens 210 and the aperture position of the aperture 211, calculates lens information according to the monitor information, or provides a look that is prepared in advance. Select lens information according to monitor information from the up table. The lens drive control device 206 calculates a lens drive amount based on the received defocus amount, and drives the focusing lens 210 to a focal point by a drive source such as a motor (not shown) based on the lens drive amount. Based on the received aperture control information, the aperture 211 is driven by a drive source such as a motor (not shown).

  FIG. 2 shows the arrangement of focus detection areas set on the imaging screen of the interchangeable lens 202 shown in FIG. In the figure, A corresponds to the celestial side of the object scene, and B corresponds to the ground side of the object field. In this embodiment, as shown in the figure, an example is shown in which focus detection areas 100a to 100i are set at a total of nine locations in the central portion and the peripheral portion of the photographing screen 100 of the interchangeable lens 202. Each of the focus detection areas 100a to 100i has a cross shape in which a focus detection area extending in the horizontal direction of the object scene and a focus detection area extending in the vertical direction of the object scene are orthogonal to each other. Note that the shape of the focus detection area is not limited to a cross shape, and the focus detection areas in the horizontal direction and the vertical direction may not intersect each other. Further, the number and arrangement of the focus detection areas are not limited to this embodiment.

  FIG. 3A is a front view of the first image sensor 220, in which “A” corresponds to the celestial side of the object scene, and “B” corresponds to the ground side of the object field. FIG. 3B is an enlarged view of the “P1” portion of the first image sensor 220 shown in FIG. 3A, and shows an array of imaging pixels. FIG. 3C is an enlarged view of the “Q1” portion of the first image sensor 220 shown in FIG. 3A, and shows an array of imaging pixels and focus detection pixels. FIG. 3C shows the focus detection pixel array 220d of the Q1 portion, but the same applies to the other focus detection pixel arrays 220a to 220c and 220e to 220i.

  In the first imaging element 220, the imaging pixels 310 are two-dimensionally arranged on the entire imaging surface corresponding to the imaging screen 100 shown in FIG. 2 of the interchangeable lens 202 (see FIG. 1), as shown in FIG. At the same time, as shown in FIG. 3C, focus detection pixel arrays 220a to 220i are arranged along the horizontal direction of the object scene at positions corresponding to the nine focus detection areas 100a to 100i in the photographing screen 100. Arranged.

  FIG. 5 is a front view of the imaging pixel 310, and FIG. 6 is a cross-sectional view of the imaging pixel 310. The imaging pixel 310 includes the microlens 10 and the photoelectric conversion element 11. The photoelectric conversion element 11 is formed on the semiconductor circuit substrate 29, the microlens 10 is disposed in front of the photoelectric conversion element 11, and the shape of the photoelectric conversion element 11 is projected forward by the microlens 10. A color filter (not shown) that transmits the green G component is installed between the microlens 10 and the photoelectric conversion element 11 in the imaging pixel 310 of the first imaging element 220.

  As described above, the first image sensor 220 receives the light beam of the green G component transmitted through the wavelength selective half mirror 223. FIG. 9 shows the transmittance characteristics of the wavelength selective half mirror 223, and FIG. 10 shows the reflectance characteristics thereof. The wavelength selective half mirror 223 has a characteristic of transmitting a G (green color light) component and reflecting other color components. Since the first image sensor 220 receives the green G component light beam that has passed through the wavelength-selective half mirror 223, the image pickup pixel 310 of the first image sensor 220 is necessarily provided with a color filter that transmits the green G component. There is no.

  In the focus detection pixel arrays 220a to 220i, as shown in FIG. 3C, two types of focus detection pixels 313 and 314 are alternately arranged on a straight line. FIG. 7 is a front view of the focus detection pixels 313 and 314, and FIG. 8 is a cross-sectional view of the focus detection pixels 313 and 314. The focus detection pixel 313 includes the microlens 10 and the photoelectric conversion element 13. The photoelectric conversion element 13 is formed on the semiconductor circuit substrate 29, the microlens 10 is disposed in front of the photoelectric conversion element 13, and the shape of the photoelectric conversion element 13 is projected forward by the microlens 10.

  On the other hand, the focus detection pixel 314 includes the microlens 10 and the photoelectric conversion element 14. The photoelectric conversion element 14 is formed on the semiconductor circuit substrate 29, the microlens 10 is disposed in front of the photoelectric conversion element 14, and the shape of the photoelectric conversion element 14 is projected forward by the microlens 10. The photoelectric conversion elements 13 and 14 of the focus detection pixels 313 and 314 are both rectangular and are arranged with respect to the center (optical axis) of the microlens 10. Note that no color filter is installed in the focus detection pixels 313 and 314.

  Next, the second image sensor 221 will be described. FIG. 4A is a front view of the second image sensor 221. “A” in the drawing corresponds to the celestial side of the object scene, and “B” corresponds to the ground side of the object field. FIG. 4B is an enlarged view of the “P2” portion of the second image sensor 221 shown in FIG. 4A, and shows an array of imaging pixels. FIG. 4C is an enlarged view of the “Q2” portion of the second image sensor 221 shown in FIG. 4A, and shows an array of imaging pixels and focus detection pixels. FIG. 4C shows the focus detection pixel array 221d of the Q2 part, but the same applies to the other focus detection pixel arrays 221a to 221c and 221e to 221i.

  In the second imaging element 221, the imaging pixels 310 are two-dimensionally arranged on the entire imaging surface corresponding to the imaging screen 100 shown in FIG. 2 of the interchangeable lens 202 (see FIG. 1) as shown in FIG. 4B. At the same time, as shown in FIG. 4C, focus detection pixel arrays 221a to 221i are arranged along the vertical direction of the object scene at positions corresponding to nine focus detection areas 100a to 100i in the photographing screen 100. Arranged.

  The focus detection pixel arrays 220a to 220i (see FIG. 3) arranged along the horizontal direction of the object scene of the first image sensor 220, and the pixels of the second image sensor 221 arranged along the vertical direction of the object field. The focus detection pixel arrays 221a to 220i (see FIG. 4) constitute focus detection areas 100a to 100i that intersect in a cross shape in the vertical and horizontal directions of the object scene shown in FIG.

  The imaging pixel 310 of the second imaging element 221 has the same configuration as the imaging pixel 310 of the first imaging element 220 shown in FIGS. 5 and 6, but the microlens 10 and the photoelectric conversion element 11 The color filters (not shown) installed between them are different. As shown in FIG. 4B, the second image sensor 221 includes an imaging pixel (blue B pixel) 310 including a color filter that transmits a blue B component, and a color filter that transmits a red R component. The imaging pixels (red R pixels) 310 are arranged in a checkered pattern.

  FIG. 11 shows the transmittance characteristics of the color filter that transmits the blue B component, and FIG. 12 shows the transmittance characteristics of the color filter that transmits the red R component. As described above, the second image sensor 221 receives light other than the green G component reflected by the wavelength selective half mirror 223. The blue pixel 310 of the second image sensor 221 receives blue B component light in the light beam reflected by the wavelength selective half mirror 223, and the red pixel 310 receives red R component light.

  On the other hand, in the focus detection pixel arrays 221a to 221i of the second image sensor 221, the two types of focus detection pixels 313 and 314 described above are alternately arranged on a straight line as shown in FIG. . The focus detection pixel arrays 221a to 221i of the second image sensor 221 are the same as the focus detection pixel arrays 220a to 220i of the first image sensor 221 except that the array directions of the focus detection pixels 313 and 314 are different.

  FIG. 13 shows the transmittance characteristics of the infrared cut filter 224 disposed on the light incident side of the wavelength selective half mirror 223.

  As described above, in the imaging apparatus according to the embodiment, the wavelength-selective half mirror 223 transmits the green G component light and reflects the light other than the green G component, and the first imaging element 220 receives the transmitted light. At the same time, the blue B component and the red R component of the reflected light are received by the second image sensor 221, so light from the subject is received by one image sensor in which RGB pixels are arranged in a Bayer array. As compared with the above, twice the amount of light can be received.

  Next, an interpolation method according to an embodiment, that is, a defect correction method, for obtaining an image output at a focus detection pixel position by interpolation based on pixel outputs of surrounding imaging pixels will be described. If a focus detection pixel is arranged in place of the image pickup pixel, an image output of the image pickup result cannot be obtained at the focus detection pixel position, and the pixel becomes a defective pixel. Therefore, the image output at the focus detection pixel position is obtained by interpolation based on the output of the surrounding imaging pixels, that is, defect correction is performed. However, when many focus detection areas are arranged in the photographing screen, the number of pixels to be subjected to interpolation processing increases, and the image processing time for defect correction becomes longer.

  Therefore, in this embodiment, subject light is obtained by two image sensors, a first image sensor 220 that receives green G component light, and a second image sensor 221 that receives blue B component and red R component light. In order to achieve high-speed interpolation processing, interpolation processing is performed independently for each of the image sensors 220 and 221. That is, the first image sensor 220 completes the defect correction regardless of the second image sensor 221, and the second image sensor 221 completes the defect correction regardless of the first image sensor 220. In the image pickup apparatus according to the embodiment, each of the first image pickup element 220 and the second image pickup element 221 can reduce the number of focus detection pixels as compared with light reception by one image pickup element. In addition, since the defect correction is performed in parallel, the speed is increased.

First, the defect correction of the first image sensor 220 will be described. FIG. 14 is a partial enlarged view of the first image sensor 220 for explaining defect correction of the first image sensor 220. For example, the image output at the focus detection pixel position in the center of the second row in the figure, that is, the pixel output (G2) obtained when the original imaging pixel 310 is arranged at this position, is above and below this position. Is obtained as an average of the pixel outputs G1 and G3 of the imaging pixel 310 adjacent to the pixel.
(G2) = (G1 + G3) / 2 (1)
With this method, the image outputs of all focus detection pixel positions arranged on the first image sensor 220 can be obtained based on the outputs of the image pixels 310 on the first image sensor 220.

Next, defect correction of the second image sensor 221 will be described. FIG. 15 is a partially enlarged view of the second image sensor 221 for explaining defect correction of the second image sensor 221. For example, the image output at the fourth focus detection pixel position from the top of the center column in the figure, that is, the pixel output (B5) obtained when the imaging blue B pixel 310 is arranged at this position, It is obtained as the average of the pixel outputs B2 and B8 of the imaging blue G pixels 310 adjacent to the left and right.
(B5) = (B2 + B8) / 2 (2)
Further, the pixel output (R5) obtained when the imaging red R pixel 310 is arranged at the above position is obtained as an average of the four diagonally adjacent R pixels R1, R3, R7, and R9 closest to this position. .
(R5) = (R1 + R3 + R7 + R9) / 4 (3)
With this method, the image outputs of all focus detection pixel positions arranged on the second image sensor 221 can be obtained based on the outputs of the image pixels 310 on the second image sensor 221.

  Here, a focus detection method using the focus detection pixel arrays 220a to 220i and 221a to 221i arranged on the first image sensor 220 and the second image sensor 221 will be described. FIG. 16 shows a configuration of a focus detection optical system of a pupil division type phase difference detection method using microlenses. The focus detection pixel portion is shown enlarged. In the figure, reference numeral 90 denotes an exit pupil set at a distance d forward from the microlens arranged on the planned imaging plane of the interchangeable lens 202 (see FIG. 1). This distance d is a distance determined according to the curvature and refractive index of the microlens, the distance between the microlens and the photoelectric conversion unit, and is referred to as a distance measuring pupil distance in this specification. 91 is an optical axis of the interchangeable lens, 10a to 10d are microlenses, 13a, 13b, 14a and 14b are photoelectric conversion elements, 313a, 313b, 314a and 314b are focus detection pixels, and 73, 74, 83 and 84 are focus detections. Luminous flux.

  Reference numeral 93 denotes a region of the photoelectric conversion elements 13a and 13b projected onto the exit pupil 90 by the microlenses 10a and 10c, and is referred to as a distance measuring pupil in this specification. In FIG. 16, for the sake of easy understanding, an elliptical region is illustrated. However, the shape of the photoelectric conversion element is actually an enlarged projection. Similarly, 94 is an area of the photoelectric conversion elements 14a and 14b projected onto the exit pupil 90 by the microlenses 10b and 10d, and is referred to as a distance measuring pupil in this specification. In FIG. 16, for the sake of easy understanding, an elliptical region is illustrated. However, the shape of the photoelectric conversion element is actually an enlarged projection.

  FIG. 16 schematically illustrates four focus detection pixels 313a, 313b, 314a, and 314b adjacent to the photographing optical axis, but photoelectric conversion elements are also used in all focus detection pixels in all focus detection areas. Are configured to receive light beams coming from the corresponding distance measuring pupils 93 and 94 to the respective microlenses. The arrangement direction of the focus detection pixels is made to coincide with the arrangement direction of the pair of distance measuring pupils, that is, the arrangement direction of the pair of photoelectric conversion elements.

  The microlenses 10a to 10d are disposed in the vicinity of the planned imaging plane of the interchangeable lens 202 (see FIG. 1), and the shapes of the photoelectric conversion units 13a, 13b, 14a, and 14b disposed behind the microlenses 10a to 10d. Is projected onto the exit pupil 90 separated from the microlenses 10a to 10c by the distance measurement pupil distance d, and the projection shape forms distance measurement pupils 93 and 94. That is, the microlens and the photoelectric conversion element in each focus detection pixel so that the projection shapes (ranging pupils 93 and 94) of the focus detection pixels coincide on the exit pupil 90 at the projection distance d. The relative positional relationship is determined, whereby the projection direction of the photoelectric conversion element in each focus detection pixel is determined.

  The photoelectric conversion element 13a passes through the distance measuring pupil 93 and outputs a signal corresponding to the light intensity of the image formed on the microlens 10a by the light beam 73 directed to the microlens 10a. Similarly, the photoelectric conversion element 13b passes through the distance measuring pupil 93 and outputs a signal corresponding to the light intensity of the image formed on the microlens 10c by the light beam 83 directed to the microlens 10c. The photoelectric conversion element 14a passes through the distance measuring pupil 94 and outputs a signal corresponding to the light intensity of the image formed on the microlens 10b by the light beam 74 directed to the microlens 10b. Similarly, the photoelectric conversion element 14b passes through the distance measuring pupil 94 and outputs a signal corresponding to the light intensity of the image formed on the microlens 10d by the light beam 84 directed to the microlens 10d.

  The above-described two types of focus detection pixels 313 and 314 are arranged in a straight line, and the output of the photoelectric conversion element of each pixel is collected into a distance measurement pupil 93 and an output group corresponding to the distance measurement pupil 94, thereby ranging. Information on the light intensity distribution of the pair of images formed on the focus detection pixel array by the focus detection light fluxes passing through the pupil 93 and the distance measurement pupil 94, respectively, is obtained. By performing a known image shift detection calculation process (correlation calculation process, phase difference detection process) on this information, the image shift amount of a pair of images is detected by a so-called pupil division type phase difference detection method. Further, by performing a conversion operation according to the center-of-gravity interval of the pair of distance measuring pupils on the image shift amount, the current imaging plane with respect to the planned imaging plane (the focal point corresponding to the position of the microlens array on the planned imaging plane) The deviation (defocus amount) of the imaging plane at the detection position is calculated.

  In this embodiment, the wavelength-selective half mirror 223 transmits green G component light, reflects light other than the green G component, receives the transmitted light by the first image sensor 220, and reflects the reflected light. Is received by the second image sensor 221, the focus detection results by the focus detection pixel arrays 220 a to 220 i on the first image sensor 220 and the focus detection pixel arrays 221 a to 221 i on the second image sensor 221. A focus detection error caused by the chromatic aberration of the interchangeable lens 202 occurs between the focus detection results of the above.

  Therefore, the lens drive control unit 206 receives the light other than the green G component when the defocus amount of the focus detection result obtained by the first image sensor 220 that receives the green G component light is used as a reference. The amount of chromatic aberration correction of the interchangeable lens 202 to be added to the defocus amount of the focus detection result obtained by the image sensor 221 is stored, and the defocus value obtained by the second image sensor 221 during the focus detection calculation in the body drive control device 214 is stored. By adding the chromatic aberration correction amount to the focus amount, the influence of the focus detection error due to the chromatic aberration of the interchangeable lens 202 can be eliminated.

《Other defect correction methods》
In the defect correction method of the embodiment described above, the method for estimating the image signal at the focus detection pixel position based on the output of the adjacent imaging pixels has been described. However, the vertical and horizontal directions of the focus detection pixel position are described. Among the pixels for imaging that are adjacent to the diagonally upward and diagonally rightward directions, the pixel output that is adjacent to the direction where the pixel output difference is small, that is, the direction where the contrast change is small, in other words, the direction where the similarity of the pixel output is high A method for performing defect correction based on FIG.

FIG. 17 is a partially enlarged view of the first image sensor 220 for explaining another defect correction method for the first image sensor 220. For example, the image output at the focus detection pixel position in the center of the second row in the figure, that is, the pixel output (G5) obtained when the imaging pixel 310 is arranged at this position is obtained as follows. (G5) Pixel output difference | G2-G8 | adjacent in the vertical direction of the position | G2-G8 |, pixel output difference | G3-G7 | adjacent in the diagonally upward right direction, adjacent in the diagonally upward left direction Among the pixel output differences | G1 to G9 | between G1 and G9, the direction with the smallest pixel output difference, that is, the direction with the highest similarity in pixel output is selected. For example, when the pixel output difference | G3-G7 | between G3 and G7 adjacent to each other in the diagonally upward direction is minimum, the pixel output (G5) is obtained as an average of the pixel outputs G3 and G7.
(G5) = (G3 + G7) / 2 (4)
The same applies to the second image sensor 221.

《Other defect correction methods》
A defect correction method that uses the output of another image sensor in order to increase the accuracy of defect correction will be described. FIG. 18 is a partially enlarged view of the first image sensor 220 and the second image sensor 221 for explaining another defect correction method of the first image sensor 220. FIG. 18A shows focus detection of the first image sensor 220. (B) is a portion centered on the pixel B6 of the second image sensor 221 corresponding to the pixel position (G6) of the first image sensor 220 shown in (a). Show.

For example, the image output at the focus detection pixel position (G6) in the center of FIG. 18A, that is, the pixel output (G6) obtained when the image sensor 310 is arranged at this position is obtained as follows. First, the similarity K1 of the vertical pixel output passing through the position (G6) and the similarity K2 of the horizontal pixel output passing through the imaging pixel G2 adjacent to the position (G6) are examined.
K1 = | G2-G1 | + | G2-G3 | (5),
K2 = | G2-G4 | + | G2-G5 | (6)
Here, in the case of K1 ≦ K2, since the vertical output similarity is higher than the horizontal output similarity, the average value of the vertical closest pixels G2 and G3 is defined as a pixel output (G6).
(G6) = (G2 + G3) / 2 (7)

In the case of K1> K2, the output similarity in the left-right direction is higher than the output similarity in the up-down direction, but there is no imaging pixel 310 in the left-right direction of the focus detection pixel position (G6). In this case, the image output (G6) is estimated based on the pixel output around the pixel B6 of the second image sensor 221 corresponding to the focus detection pixel position (G6) of the first image sensor 220. Since it is known that the output similarity in the horizontal direction is high, attention is paid to the pixel position (B2) of the second image sensor 221 corresponding to the pixel G2 of the first image sensor 220. Actually, the red R pixel is arranged at the pixel position (B2), but the blue B pixel output (B2) is estimated on the assumption that the blue B pixel is arranged.
(B2) = (B7 + B8) / 2 (8)

Next, paying attention to the pixel position (B3) of the second image sensor 221 corresponding to the pixel G3 of the first image sensor 220, the red R pixel is actually arranged at this pixel position (B3). The blue B pixel output (B3) is estimated on the assumption that blue B pixels are arranged.
(B3) = (B9 + B10) / 2 (9)
The pixel output (G6) of the first image sensor 220 is estimated using the pixel outputs (B2) and (B3) thus estimated and the pixel outputs G2 and G3.
(G6) = {G2 · (B6 / B2) + G3 · (B6 / B3)} / 2 (10)

  In addition, in order to obtain the image output of the focus detection pixel position (G6), the example in which the pixel output in the higher direction among the output similarities in the vertical direction and the horizontal direction is shown, but the vertical direction, the horizontal direction, By using the pixel output in the higher direction among the similarities of the pixel outputs in the four directions of the right-up diagonal direction and the left-up diagonal direction, the pixel output (G6) can be estimated more accurately.

  The body drive control device 214 interpolates the image signal at the focus detection pixel position based on the output of the surrounding imaging pixels, and then outputs the green G component image output of the first imaging element 220 and the second imaging element 221. A subject image is generated based on the image output of the blue B component and the red R component, and is recorded on the memory card 219.

<< Other arrangement examples of the focus detection area >>
In the embodiment described above, as shown in FIG. 2, an example is shown in which a focus detection area in which a focus detection area extending in the horizontal direction and a focus detection area extending in the vertical direction intersect in a cross shape is arranged. However, for example, as shown in FIG. 19, the focus detection area extending in the radial direction from the center of the imaging screen 100 and the focus detection area extending in the direction orthogonal to the radial direction from the center of the imaging screen intersect in a cross shape 4 The focus detection areas 100a ′, 100b ′, 100c ′, and 100d ′ may be arranged. In the figure, A corresponds to the celestial side of the object scene, and B corresponds to the ground side of the object field.

  For such focus detection area arrangement, the wavelength-selective half mirror 223 transmits green G component light and reflects light other than the green G component, and the first imaging element 220 ′ receives the transmitted light. At the same time, the blue B component and the red R component of the reflected light are received by the second image sensor 221 ′. FIG. 20 shows an array of focus detection pixels 313 ′ and 314 ′ corresponding to the focus detection area 100 a ′ in the first image sensor 220 ′. FIG. 21 shows an array of focus detection pixels 313 ′ and 314 ′ corresponding to the focus detection area 100 a ′ in the second image sensor 221 ′. The focus detection pixel array of the first image sensor 220 'and the focus detection pixel array of the second image sensor 221' constitute a cross-shaped focus detection area 100a '. The same applies to the other focus detection areas 100b 'to 100d'.

  As described above, when the focus detection area is arranged in the peripheral portion of the imaging screen 100 of the interchangeable lens 202, the focus detection light beam is arranged at least in the direction orthogonal to the radiation direction from the center of the imaging screen. Even if vignetting is caused by the interchangeable lens 202, it is possible to prevent the focus detection accuracy from being lowered.

  In the above-described embodiment, the subject light is received by the two image sensors, the first image sensor that receives the green G component light and the second image sensor that receives the blue B component and red R component light. Although an example of a configuration for receiving light is shown, the color component of light received by the image sensor is not limited to the above-described embodiment, and the first image sensor receives light of a predetermined color component, and the second The image sensor may receive light of a plurality of color components other than a predetermined color component. In this case, the predetermined color component is desirably green that is closest to human visibility, but may be a color other than green. Further, the second image sensor may discriminately receive light of three or more color components other than the predetermined color component using a color filter.

  In the imaging device according to the embodiment described above, the wavelength-selective half mirror transmits light of the green G component and reflects light other than the green G component, and the transmitted light is received by the first imaging device. Although the example in which the second image sensor receives light of the blue B component and the red R component of the reflected light has been shown, the wavelength selective light beam splitting means is not limited to the half mirror, and the light of a predetermined color component is received. Any wavelength splitting beam splitting means that transmits light and reflects light of a color component other than a predetermined color component may be used. For example, a wavelength-selective pellicle mirror or beam splitter may be used.

  In the above-described embodiment, the wavelength-selective half mirror transmits the green G component light, reflects the light other than the green G component, receives the transmitted light by the first image sensor, and includes the reflected light. Although an example in which the light of the blue B component and the red R component is received by the second image sensor has been shown, the first light beam and the second light beam are not reflected by the wavelength selectivity, that is, by the half mirror, pellicle mirror, or beam splitter that does not have spectral characteristics. The first luminous flux is divided into luminous fluxes, and the first luminous flux is received by a first imaging element of an imaging pixel having a color filter of a predetermined color component, and the second luminous flux is a color filter of a plurality of color components other than the predetermined color component. It is good also as a structure which receives light with the 2nd image pick-up element of the pixel for imaging provided with.

  In the above-described embodiment, an example in which two types of focus detection pixels are alternately arranged has been described. However, the arrangement of the two types of focus detection pixels is not limited to this one embodiment. Arrangements such as 1, 2, 2, 1, 1, 1, 2, 2... Furthermore, it is also possible to arrange the focus detection pixel arrays in two rows.

  In the above-described embodiment, the first focus detection pixel having a rectangular photoelectric conversion element whose front shape is the left half and the second focus detection pixel having a rectangular photoelectric conversion element whose front shape is the right half are used. However, the front shape of the photoelectric conversion element of the focus detection pixel is not limited to the front shape of this embodiment, and may be, for example, a left semicircle and a right semicircle. Furthermore, one focus detection pixel includes a rectangular photoelectric conversion element whose front shape is the left half (or upper half) and a rectangular photoelectric conversion element whose illumination shape is the left half (or lower half). Focus detection pixels may be used.

  It should be noted that in the above-described one embodiment and the modifications thereof, any combination of the one embodiment and the modification is possible.

  According to the above-described embodiment and its modifications, the following operational effects can be achieved. First, an image is formed by the interchangeable lens 202 and a wavelength-selective half mirror 223 that divides the light beam transmitted through the interchangeable lens 202 into a first light beam of a green component and a second light beam of a color component other than the green component. The imaging pixels 310 for capturing the subject image are arranged in a two-dimensional manner, and focus detection pixel arrays 313 and 314 for detecting the focus adjustment state of the interchangeable lens 202 are partially arranged in the two-dimensional array. An imaging pixel 310 having a first imaging element 220 that receives the first luminous flux and a color filter of a plurality of colors other than green, and for imaging a subject image formed by the interchangeable lens 202 The imaging pixels 310 are arrayed two-dimensionally, and focus detection pixel arrays 313 and 314 for detecting the focus adjustment state of the interchangeable lens 202 in a part of the two-dimensional array. Provided with a second image sensor 221 that receives the second light flux, and outputs an image output at a pixel position where the focus detection pixels 313 and 314 are arranged, to the imaging pixels 310 around the focus detection pixels 313 and 314. Since the subject image is generated based on the output of the first image sensor 220 and the output of the second image sensor 221, the focus in various directions is obtained at many positions in the shooting screen. Even when detection is performed, the interpolation processing at the focus detection pixel position is simplified, and a subject image can be generated in a short time, so that deterioration in image quality due to the interpolation processing can be prevented.

  An imaging pixel having a half mirror that divides a light beam transmitted through the imaging optical system into a first light beam and a second light beam different from each other, and a color filter of a predetermined color. A pixel array for focus detection for detecting the focus adjustment state of the imaging optical system in a part of the two-dimensional array as well as two-dimensionally arraying the imaging pixels for capturing the subject image to be formed An imaging pixel having a first imaging element that receives the first light flux and a color filter of a plurality of colors other than a predetermined color, and images a subject image formed by an imaging optical system In addition, the imaging pixels are arranged in a two-dimensional array, and a focus detection pixel array for detecting the focus adjustment state of the imaging optical system is provided in a part of the two-dimensional array to receive the second light flux A second image pickup device, and a focus detection image Is interpolated based on the output of the image pickup pixels around the focus detection pixel, and generates a subject image based on the output of the first image pickup device and the output of the second image pickup device. So, even when performing focus detection in various directions at many positions in the shooting screen, the interpolation processing at the focus detection pixel position is simplified and a subject image can be generated in a short time. Degradation of image quality due to interpolation processing can be prevented.

  According to the above-described embodiment and its modification, the image output at the focus detection pixel position on the first image sensor is calculated by interpolation based on the output of the image sensor pixel on the first image sensor, Since the image output at the focus detection pixel position on the second image sensor is calculated by interpolation based on the output of the image sensor pixel on the second image sensor, what is the second image sensor in the first image sensor? The defect correction can be completed independently of each other, and the second image sensor can complete the defect correction independently of the first image sensor, and the interpolation process can be performed independently for each image sensor to achieve a high-speed interpolation process.

  According to the embodiment and the modification described above, the output similarity of the imaging pixels arranged along the straight lines in the plurality of directions passing through the focus detection pixel positions is detected, and the direction in which the output similarity is high Since the image output at the focus detection pixel position is calculated by interpolation based on the output of the imaging pixels arranged on the straight line, the image signal at the focus detection pixel position can be accurately obtained, which is high. A quality subject image can be generated.

  According to the above-described embodiment and its modification, the output similarity of the imaging pixels in the arrangement direction of the focus detection pixel array on one of the first and second imaging elements is calculated on the other side. Since the calculation is based on the output similarity of the imaging pixels arranged in the direction corresponding to the arrangement direction on the imaging element, the similarity of the pixel outputs in the focus detection pixel arrangement direction is accurately estimated. And a high-quality subject image can be generated.

  According to the above-described embodiment and its modification, the focus adjustment state of the imaging optical system is detected based on the output of the focus detection pixel on the first image sensor, and the focus detection on the second image sensor. Since the focus adjustment state of the imaging optical system is detected based on the output of the imaging pixel and the focus detection result is corrected based on the amount of chromatic aberration of the imaging optical system, the focus due to the difference in color received by the image sensor The error in the detection result can be reduced.

The figure which shows the structure of one embodiment The figure which shows arrangement | positioning of the focus detection area set to the imaging | photography screen of the interchangeable lens shown in FIG. Front view and partial enlarged view of the first image sensor Front view and partial enlarged view of second image sensor Front view of imaging pixels Cross-sectional view of imaging pixels Front view of focus detection pixels Cross section of focus detection pixel Diagram showing transmittance characteristics of wavelength selective half mirror Diagram showing reflectance characteristics of wavelength selective half mirror The figure which shows the transmittance | permeability characteristic of the color filter installed in the blue B pixel for imaging The figure which shows the transmittance | permeability characteristic of the color filter installed in the red R pixel for imaging Diagram showing transmittance characteristics of infrared cut filter The elements on larger scale of the 1st image sensor for demonstrating defect correction of the 1st image sensor Partial enlarged view of the second image sensor for explaining defect correction of the second image sensor The figure which shows the structure of the focus detection optical system of the pupil division type phase difference detection method using a micro lens The elements on larger scale of the 1st image sensor for demonstrating other defect correction methods of the 1st image sensor The elements on larger scale of the 1st image sensor and the 2nd image sensor 221 for explaining other defective methods of the 1st image sensor The figure which shows the other example of arrangement | positioning of a focus detection area The figure which shows the pixel array for focus detection on the 1st image pick-up element corresponding to the focus detection area shown in FIG. The figure which shows the pixel array for focus detection on the 1st image pick-up element corresponding to the focus detection area shown in FIG.

Explanation of symbols

10; microlens, 11, 12, 13; photoelectric conversion element, 201; imaging device, 220; first imaging element, 221; second imaging element, 220a to 220i, 221a to 221i; focus detection pixel array, 214; Body drive control device, 223; wavelength selective half mirror, 310; imaging pixel, 313, 314; focus detection pixel

Claims (11)

A light beam splitting unit that splits a light beam transmitted through the imaging optical system into a first light beam having a predetermined color component and a second light beam having a color component other than the predetermined color component;
The imaging pixels for imaging the subject image formed by the imaging optical system are arranged two-dimensionally, and a focal point of the imaging optical system is arranged along a predetermined direction in a part of the two-dimensional arrangement. A first image sensor for providing a focus detection pixel array for detecting an adjustment state and receiving the first light beam;
An imaging pixel having a color filter of a plurality of colors other than the predetermined color, the imaging pixels for imaging a subject image formed by the imaging optical system are two-dimensionally arranged, A focus detection pixel array for detecting a focus adjustment state of the imaging optical system is provided in a part of the two-dimensional array along a direction orthogonal to the predetermined direction, and receives a second light flux. Two image sensors;
The image output at the pixel position where the focus detection pixel is arranged is interpolated based on the output of the imaging pixel around the focus detection pixel, and the output of the first imaging device and the second imaging An imaging apparatus comprising: an image generation unit configured to generate a subject image based on an output of the element. A light beam splitting unit that splits a light beam transmitted through the imaging optical system into a first light beam having a predetermined color component and a second light beam having a color component other than the predetermined color component;
The imaging pixels for imaging the subject image formed by the imaging optical system are arranged two-dimensionally, and the focus adjustment state of the imaging optical system is detected in a part of the two-dimensional arrangement A first image sensor for providing a focus detection pixel array for receiving the first light flux;
An imaging pixel having a color filter of a plurality of colors other than the predetermined color, the imaging pixels for imaging a subject image formed by the imaging optical system are two-dimensionally arranged, A focus detection pixel array for detecting a focus adjustment state of the imaging optical system is provided in a part of the two-dimensional array, and a second image sensor that receives the second light flux;
The image output at the pixel position where the focus detection pixel is arranged is interpolated based on the output of the imaging pixel around the focus detection pixel, and the output of the first imaging device and the second imaging Rutotomoni a image generating means for generating an object image on the basis of the output of the device,
The array direction of the subject image area received by the focus detection pixel array in the first image sensor is different from the array direction of the subject image area received by the focus detection pixel array in the second image sensor. An imaging device that is characterized. The imaging device according to claim 1 or 2 ,
A region of the subject image received by the focus detection pixel array in the first image sensor intersects with a region of the subject image received by the focus detection pixel array in the second image sensor. An imaging device. A light beam splitting means for splitting a light beam transmitted through the imaging optical system into a first light beam and a second light beam different from each other;
An imaging pixel having a color filter of a predetermined color, wherein the imaging pixels for imaging the subject image formed by the imaging optical system are two-dimensionally arranged, A first imaging element for receiving a first light flux, wherein a focus detection pixel array for detecting a focus adjustment state of the imaging optical system is provided in a part along a predetermined direction ;
An imaging pixel having a color filter of a plurality of colors other than the predetermined color, the imaging pixels for imaging a subject image formed by the imaging optical system are two-dimensionally arranged, A focus detection pixel array for detecting a focus adjustment state of the imaging optical system is provided in a part of the two-dimensional array along a direction orthogonal to the predetermined direction, and receives a second light flux. Two image sensors;
The image output at the pixel position where the focus detection pixel is arranged is interpolated based on the output of the imaging pixel around the focus detection pixel, and the output of the first imaging device and the second imaging An imaging apparatus comprising: an image generation unit configured to generate a subject image based on an output of the element. In the imaging device according to any one of claims 1 to 4 ,
The image generation means calculates an image output at the focus detection pixel position on the first image pickup device by interpolation based on an output of the image pickup pixel on the first image pickup device. An imaging device. In the imaging device according to any one of claims 1 to 4 ,
The image generation means calculates an image output at the focus detection pixel position on the second imaging element by interpolation based on an output of the imaging pixel on the second imaging element. An imaging device. In the imaging device according to any one of claims 1 to 6 ,
The image generating means detects the similarity of outputs of adjacent imaging pixels arranged along a plurality of directional lines passing through the focus detection pixel position, and is arranged on a straight line having a high output similarity. An image output apparatus that calculates an image output at the focus detection pixel position by interpolation based on the output of the image pickup pixel. The imaging apparatus according to claim 7 ,
The image generation means calculates the output similarity of the imaging pixels in the arrangement direction of the focus detection pixel array on one of the first and second imaging elements on the other imaging element. An image pickup apparatus that calculates based on output similarity of image pickup pixels arranged in a direction corresponding to the arrangement direction. In the imaging device according to any one of claims 1 to 8 ,
The focus adjustment state of the imaging optical system is detected based on the output of the focus detection pixel on the first image sensor, and based on the output of the focus detection pixel on the second image sensor. Focus detection means for detecting a focus adjustment state of the imaging optical system;
An imaging apparatus comprising: a chromatic aberration correction unit that corrects a detection result of the focus detection unit based on a chromatic aberration amount of the imaging optical system. In the imaging device according to any one of claims 1 to 9 ,
The imaging apparatus, wherein the focus detection pixel array is arranged along a direction orthogonal to a radiation direction from a center of a photographing screen of the photographing optical system. In the imaging device according to any one of claims 1 to 10 ,
The imaging pixel includes a microlens and a photoelectric conversion element that receives light from the imaging optical system via the microlens,
The focus detection pixel includes a microlens and a photoelectric conversion element that is arranged eccentrically from the center of the microlens and receives light from the imaging optical system via the microlens. Imaging device.

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