Image analysis – Image enhancement or restoration – Focus measuring or adjusting
Patent
1995-03-16
1999-06-22
Shalwala, Bipin
Image analysis
Image enhancement or restoration
Focus measuring or adjusting
382254, 382321, 348335, 348342, 348351, 348355, G06K 940, G06K 710, G02B 1316, H04N 5225
Patent
active
059150475
ABSTRACT:
There is provided an image pickup apparatus capable of operating only at the time of occurrence of moire and reducing the moire without the need to use an optical low-pass filter and without degrading image quality. The image pickup apparatus is provided with a circuit for detecting, from an output signal of an image sensor, the amount of aliasing distortion (moire) which occurs when sampling is performed at the pitch of pixels of the image sensor, and determining whether moire has occurred. On the basis of the detected amount of moire, the distance between a photographic lens and the image sensor is made to vary or electrical processing is applied to the output signal from the image sensor, thereby reducing the moire. Also, an image signal appearing when the photographic lens is located at a position deviated from an in-focus position is subtracted from an image signal appearing when the photographic lens is located at the in-focus position, whereby only a moire component is separated to be subtracted from the image signal appearing when the photographic lens is located at the in-focus position.
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patent: 5231489 (1993-07-01), Penney
Canon Kabushiki Kaisha
Mariam Daniel G.
Shalwala Bipin
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