发明名称 |
FOCUS DETECTOR, AND LENS APPARATUS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME |
摘要 |
A focus detector for detecting a defocus amount of an image pickup optical system based on a displacement amount between two images formed by two beams divided from the image pickup optical system and passed through two pupil areas, the focus detector including: two lenses; two phase difference sensors for photoelectrically converting two subject images formed by the two lenses into two image signals; a correlation computing unit for dividing the two image signals based on a reference number-of-pixels to compute an image displacement amount for each divided area; a waveform coincidence computing unit for computing a coincidence degree of the two image signals in the each divided area in which the image displacement amount is computed by the correlation computing unit; and a defocus computing unit for computing a defocus amount based on the coincidence degree of the two image signals computed by the waveform coincidence computing unit. |
申请公布号 |
US2014347550(A1) |
申请公布日期 |
2014.11.27 |
申请号 |
US201414458404 |
申请日期 |
2014.08.13 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
KARASAWA Katsumi |
分类号 |
H04N5/232;G03B13/36 |
主分类号 |
H04N5/232 |
代理机构 |
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代理人 |
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主权项 |
1. A focus detector for detecting a defocus amount of an image pickup optical system based on a displacement amount between a pair of images formed by a pair of light beams divided from the image pickup optical system and passed through a pair of pupil areas, the focus detector comprising:
a pair of lenses; a pair of phase difference detecting sensors for photoelectrically converting a pair of subject images formed by the pair of lenses into a pair of image signals; a first correlation computing unit for dividing the pair of image signals based on a reference number-of-pixels to compute an image displacement amount for each divided area; a waveform coincidence degree computing unit for computing a coincidence degree of the pair of image signals in the each divided area in which the image displacement amount is computed by the first correlation computing unit; and a defocus amount computing unit for computing a defocus amount based on the coincidence degree of the pair of image signals computed by the waveform coincidence degree computing unit. |
地址 |
Tokyo JP |