IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0702605
(2007-02-06)
|
등록번호 |
US-7812881
(2010-11-01)
|
우선권정보 |
JP-2006-108955(2006-04-11) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
9 |
초록
▼
An imaging device includes an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels, a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from e
An imaging device includes an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels, a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from each focus detection pixel to an image output at the focus detection pixel, in correspondence to an aperture value set at an imaging optical system, and an estimating circuit that estimates the image output at the focus detection pixel based upon the conversion coefficient and the output from the focus detection pixel.
대표청구항
▼
What is claimed is: 1. An imaging device comprising: an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; a coefficient setting circuit that sets a conversion coefficient to be used
What is claimed is: 1. An imaging device comprising: an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from each focus detection pixel to a calculated image output at the focus detection pixel, in correspondence to an aperture value set at an imaging optical system via which an image is formed on the image sensor; and an arithmetic circuit that calculates the calculated image output at the focus detection pixel based upon the conversion coefficient set by the coefficient setting circuit and the output from the focus detection pixel, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel. 2. An imaging device according to claim 1, wherein: the image sensor includes a plurality of two-dimensionally arrayed pixel units each made up with a plurality of types of imaging pixels with different spectral sensitivity characteristics from one another disposed with a specific rule and also includes focus detection pixels with sensitivity over a range containing all spectral sensitivity characteristics of the pixel units, disposed within the array of the imaging pixels. 3. An imaging device according to claim 2, wherein: the pixel units each include three different types of pixels sensitive to red, green and blue, disposed in a Bayer array. 4. An imaging device according to claim 3, wherein: the focus detection pixels are disposed on the image sensor at positions corresponding to a horizontal row or a vertical row in which the imaging pixels sensitive to blue and green would otherwise be disposed along a straight line. 5. An imaging device according to claim 1, wherein: the imaging pixels and the focus detection pixels each include a micro-lens and a photoelectric conversion unit. 6. An imaging device according to claim 1, wherein: the focus detection pixels detect a pair of images formed with a pair of light fluxes passing through a pair of areas at an exit pupil of the imaging optical system. 7. An imaging device according to claim 1, wherein: the coefficient setting circuit stores in advance a table of conversion coefficients corresponding to the aperture value set at the imaging optical system and selects a conversion coefficient corresponding to the aperture value set at the imaging optical system by referencing the table. 8. An imaging device according to claim 7, wherein: the image sensor includes the focus detection pixels in correspondence to each of a plurality of focus detection areas set at a predetermined imaging plane of the imaging optical system; and the coefficient setting circuit stores the table of conversion coefficients corresponding to the aperture value set at the imaging optical system in correspondence to each of the focus detection areas. 9. An imaging device comprising: an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from each focus detection pixel to a calculated image output at the focus detection pixel, in correspondence to an aperture value set at an imaging optical system via which an image is formed on the image sensor; and an arithmetic circuit that determines through arithmetic operation an output structure of the calculated image at the focus detection pixel based upon outputs from the imaging pixels around the focus detection pixel and calculates the calculated image output at the focus detection pixel based upon the output structure, the output from the focus detection pixel and the conversion coefficient set by the coefficient setting circuit, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel, and the output structure is determined as an output composition ratio of a subset of a predetermined number of the outputs from the imaging pixels around the focus detection pixel, relative to the predetermined number of the outputs from the imaging pixels around the focus detection pixel. 10. An imaging device comprising: an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from each focus detection pixel to a first calculated image output at the focus detection pixel, in correspondence to an aperture value set at an imaging optical system via which an image is formed on the image sensor; a first arithmetic circuit that calculates a second calculated image output at the focus detection pixel by statistically processing outputs from the imaging pixels around the focus detection pixel; a second arithmetic circuit that calculates through arithmetic operation an output structure of outputs from the imaging pixels around the focus detection pixel and calculates the first calculated image output at the focus detection pixel based upon the output structure, the output from the focus detection pixel and the conversion coefficient set by the coefficient setting circuit; and a determining circuit that determines a third calculated image output at the focus detection pixel through weighted addition executed by individually weighting the second calculated image output calculated by the first arithmetic circuit and the first calculated image output calculated by the second arithmetic circuit, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel, and the output structure is determined as an output composition ratio of a subset of a predetermined number of the outputs from the imaging pixels around the focus detection pixel, relative to the predetermined number of the outputs from the imaging pixels around the focus detection pixel. 11. An imaging device comprising: an image sensor that includes a plurality of types of imaging pixels with spectral sensitivity characteristics different from one another, which are disposed in a two-dimensional array, and focus detection pixels with sensitivity over a range containing all the spectral sensitivity characteristics, which are disposed in part of the array of the imaging pixels; a coefficient setting circuit that sets a conversion coefficient to be used to convert an output from each focus detection pixel to a first calculated image output at the focus detection pixel, in correspondence to an aperture value set at an imaging optical system via which an image is formed on the image sensor; a first arithmetic circuit that corrects outputs of the imaging pixels disposed at low density based upon outputs from the imaging pixels disposed at high density among the imaging pixels present around the focus detection pixel, and calculates a second image output at the focus detection pixel based upon the corrected outputs of the imaging pixels disposed at low density; a second arithmetic circuit that determines through arithmetic operation an output structure of outputs from the imaging pixels around the focus detection pixel and calculates the first image output at the focus detection pixel based upon the output structure, the output from the focus detection pixel and the conversion coefficient set by the coefficient setting circuit; and a determining circuit that determines a third image output at the focus detection pixel based upon the second image output calculated by the first arithmetic circuit and the first image output calculated by the second arithmetic circuit, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel, and the output structure is determined as an output composition ratio of a subset of a predetermined number of the outputs from the imaging pixels around the focus detection pixel, relative to the predetermined number of the outputs from the imaging pixels around the focus detection pixel. 12. A camera comprising: an image sensor that includes two-dimensionally arrayed imaging pixels and focus detection pixels, and captures an image formed via an imaging optical system with light fluxes that enter the imaging pixels via the imaging optical system and light fluxes that enter the focus detection pixels via the imaging optical system, passing through an exit pupil of the imaging optical system over areas different in size from each other; and a correction circuit that corrects an image output generated based upon outputs from the imaging pixels and an image output generated based upon outputs from the focus detection pixels, with a conversion coefficient in correspondence to an aperture value set at the imaging optical system, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to an output from a focus detection pixel. 13. An image processing method comprising: providing an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; setting a conversion coefficient to be used to convert an output from each focus detection pixel to a calculated image output at the focus detection pixel in correspondence to an aperture value set at an imaging optical system; and calculating the calculated image output at the focus detection pixel based upon the conversion coefficient having been set and the output from the focus detection pixel, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel. 14. An image processing method comprising: providing an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; setting a conversion coefficient to be used to convert an output from each focus detection pixel to a calculated image output at the focus detection pixel in correspondence to an aperture value set at an imaging optical system; and determining through arithmetic operation an output structure of the calculated image at the focus detection pixel based upon outputs from the imaging pixels around the focus detection pixel, and calculating the calculated image output at the focus detection pixel based upon the output structure, the output from the focus detection pixel and the conversion coefficient having been set, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel, and the output structure is determined as an output composition ratio of a subset of a predetermined number of the outputs from the imaging pixels around the focus detection pixel, relative to the predetermined number of the outputs from the imaging pixels around the focus detection pixel. 15. An image processing method comprising: providing an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels; setting a conversion coefficient to be used to convert an output from each focus detection pixel to a first calculated image output at the focus detection pixel in correspondence to an aperture value set at an imaging optical system via which an image is formed on the image sensor; executing a first arithmetic processing to calculate a second image output at the focus detection pixel by statistically processing outputs from the imaging pixels around the focus detection pixel; executing a second arithmetic processing to determine through arithmetic operation an output structure of outputs from the imaging pixels around the focus detection pixel and calculate the first image output at the focus detection pixel based upon the image output structure, the output from the focus detection pixel and the conversion coefficient having been set; and determining a third calculated image output at the focus detection pixel through weighted addition executed by individually weighting the second image output calculated through the first arithmetic processing and the first image output calculated through the second arithmetic processing, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel, and the output structure is determined as an output composition ratio of a subset of a predetermined number of the outputs from the imaging pixels around the focus detection pixel, relative to the predetermined number of the outputs from the imaging pixels around the focus detection pixel. 16. An image processing method comprising: providing an image sensor that includes a plurality of types of imaging pixels with spectral sensitivity characteristics different from one another, disposed in a two-dimensional array, and focus detection pixels with sensitivity over a range containing all the spectral sensitivity characteristics, which are disposed in part of the array of the imaging pixels; setting a conversion coefficient to be used to convert an output from each focus detection pixel to a first calculated image output at the focus detection pixel in correspondence to an aperture value set at an imaging optical system via which an image is formed on the image sensor; executing a first arithmetic processing to correct outputs from imaging pixels disposed at low density based upon outputs from imaging pixels disposed at a high density among the imaging pixels present around the focus detection pixel and calculating a second image output at the focus detection pixel based upon the corrected outputs of the imaging pixels disposed at low density; executing a second arithmetic processing to determine through arithmetic operation an output structure of outputs from the imaging pixels around the focus detection pixel and calculate the first image output at the focus detection pixel based upon the image output structure, the output from the focus detection pixel and the conversion coefficient having been set; and determining a third image output at the focus detection pixel based upon the second image output calculated through the first arithmetic processing and the first image output calculated through the second arithmetic processing, wherein the conversion coefficient is calculated as a ratio of an output from an imaging pixel to the output from the focus detection pixel, and the output structure is determined as an output composition ratio of a subset of a predetermined number of the outputs from the imaging pixels around the focus detection pixel, relative to the predetermined number of the outputs from the imaging pixels around the focus detection pixel. 17. Digital camera for converting a subject image into image data, comprising: an imaging optical system including an aperture, an aperture value of which is adjustable; an image sensor that includes imaging pixels that are disposed in a two-dimensional array and focus detection pixels disposed in part of the array of the imaging pixels, the imaging pixels outputting image output signals and the focus detection pixels outputting focus detection output signals; a coefficient setting circuit that sets a conversion coefficient in correspondence to the aperture value of the aperture; and an arithmetic circuit that calculates the image output signals at the focus detection pixels based upon the conversion coefficient set by the coefficient setting circuit and the focus detection output signals from the focus detection pixels, wherein: the image data are generated based upon the image output signals from the imaging pixels and the image output signals calculated by the arithmetic circuit, wherein the conversion coefficient is calculated as a ratio of an image output signal from an imaging pixel to a focus detection output signal from a focus detection pixel.
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