Signal processing apparatus for focus detection, signal processing method, and image pickup apparatus
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04N-007/18
H04N-005/232
출원번호
US-0910431
(2013-06-05)
등록번호
US-10212394
(2019-02-19)
우선권정보
JP-2012-134906 (2012-06-14)
발명자
/ 주소
Ogawa, Takeshi
출원인 / 주소
Canon Kabushiki Kaisha
대리인 / 주소
Venable LLP
인용정보
피인용 횟수 :
0인용 특허 :
12
초록▼
A signal processing apparatus for obtaining a correlation between an A-image signal and a B-image signal which are output from an image pickup unit to be input and calculating a defocus amount includes: a near-in-focus detection unit for detecting a pixel signal in an in-focus state between the A- a
A signal processing apparatus for obtaining a correlation between an A-image signal and a B-image signal which are output from an image pickup unit to be input and calculating a defocus amount includes: a near-in-focus detection unit for detecting a pixel signal in an in-focus state between the A- and B-image signals; and a correlation operation unit for operating a correlation between the A- and B-image signals, wherein the correlation operation unit has a mode for excluding the detected pixel signal in the in-focus state from a subject of the correlation operation in accordance with a detection result of the near-in-focus detection unit.
대표청구항▼
1. A signal processing apparatus for processing image signals, which are acquired from an image sensor arranged with a plurality of pixels, comprising: at least one processor; anda memory,wherein the at least one processor is configured to function as: a correlation operation unit configured to perf
1. A signal processing apparatus for processing image signals, which are acquired from an image sensor arranged with a plurality of pixels, comprising: at least one processor; anda memory,wherein the at least one processor is configured to function as: a correlation operation unit configured to perform a correlation operation with shifting of an A-image signal and a B-image signal respectively corresponding to a plurality of predetermined pixels of the image sensor,an acquiring unit configured to acquire a defocus amount based on an output of the correlation operation, anda control unit configured to determine image signals, included within the A-image signal and the B-image signal, with which the correlation operation is not to be performed, based on a comparison of a difference between the A-image signal and the B-image signal with a predetermined value, and to control the correlation operation unit to perform the correlation operation based on portions of the A-image signal and the B-image signal other than the determined image signals without performing the correlation operation on the determined image signals, andwherein the acquiring unit is configured to acquire the defocus amount based on the output of the correlation operation performed in the correlation operation unit which is based on the portions of the A-image signal and B-image signal other than the determined image signals. 2. An apparatus according to claim 1, wherein the control unit determines that the correlation operation is not to be performed on the image signals for which the differences between the corresponding image signals of the A-image signal and the B-image signal are less than the predetermined value. 3. An apparatus according to claim 1, wherein the control unit includes: a discrimination unit configured to comparison-discriminate the predetermined value, which is provided from outside of the apparatus, with a difference between the plurality of image signals and determine the image signals for which the correlation operation is not to be performed; and a replacement unit configured to replace the determined image signals with signals of a preset value in accordance with a result of the discrimination by the discrimination unit and output the plurality of image signals. 4. An apparatus according to claim 3, wherein the correlation operation unit includes: an operation unit configured to perform a correlation operation of the image signals which are output from the control unit;a image signal detection unit configured to detect the image signals of the preset value included in the image signals which are output from the control unit; andan input control unit configured to control the input of the image signals which are output from the control unit to the operation unit in accordance with a result of the detection by the image signal detection unit. 5. An apparatus according to claim 4, wherein the correlation operation unit includes: a count unit configured to count the number of times of the detection at the time when the image signal of the predetermined value is detected by the image signal detection unit; anda normalization unit configured to normalize an output of the operation unit on the basis of the number of detection times counted by the count unit. 6. An apparatus according to claim 5, wherein the correlation operation unit generates a waveform of the number of detection times corresponding to the output of the operation unit on the basis of the number of detection times counted by the count unit, andthe normalization unit normalizes the output of the operation unit on the basis of the waveform. 7. A method for processing image signals, which are acquired from an image sensor arranged with a plurality of pixels, comprising: determining image signals included within an A-image signal and a B-image signal for which a correlation operation is not to be performed, based on a comparison of a difference between the A-image signal and the B-image signal with a predetermined value, the A-image signal and the B-image signal respectively corresponding to a plurality of predetermined pixels of the image sensor;performing a correlation operation with shifting of the A-image signal and the B-image signal, based on portions of the A-image signal and the B-image signal other than the determined image signals determined in the determining step without performing the correlation operation on the determined image signals; andacquiring a defocus amount based on an output of the correlation operation performing step,wherein the acquiring step is configured to acquire the defocus amount based on the output of the correlation operation performed in the correlation operation step which is based on the portions of the A-image signal and B-image signal other than the determined image signals. 8. A method according to claim 7, wherein the determining step determines that the correlation operation is not to be performed on the image signals for which the differences between the corresponding image signals of the A-image signal and the B-image signal are less than the predetermined value. 9. A method according to claim 8, wherein the determining step includes: comparison-discriminating the predetermined value, which is externally-provided, with a difference between the plurality of image signals and determining the image signals for which the correlation operation is not to be performed; andreplacing the determined image signals with signals of a preset value in accordance with a result of the discrimination by the comparison-discriminating step and outputting the plurality of image signals. 10. A method according to claim 9, wherein the correlation operation performing step includes: performing a correlation operation of the image signals which are output from the determining step;detecting the image signals of the preset value included in the image signals which are output from the determining step; andcontrolling the input of the image signals which are output from the determining step to the image signal correlation operation performing step in accordance with a result of the detection by the preset value image signal detecting step. 11. A method according to claim 10, wherein the correlation operation performing step includes: counting the number of times of the detection at the time when the image signal of the predetermined value is detected by the preset value image signal detecting step; andnormalizing an output of the image signal correlation operation performing step on the basis of the number of detection times counted by the counting step. 12. A method according to claim 11, wherein the correlation operation performing step generates a waveform of the number of detection times corresponding to the output of the image signal correlation operation performing step on the basis of the number of detection times counted by the counting step, andthe normalizing step normalizes the output of the image signal correlation operation performing step on the basis of the waveform.
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이 특허에 인용된 특허 (12)
Hayashi, Asao; Oinoue, Kenichi; Aoki, Masahiro; Ida, Masatoshi, Apparatus and method for detecting focus condition of imaging optical system employing both sharpness detection and lateral shift detection.
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Suda, Yasuo, Focus detecting device with photoelectric conversion portion having microlens and with light blocking portion having first and second openings.
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