Image analysis – Histogram processing – For setting a threshold
Patent
1991-03-26
1991-11-05
Razavi, Michael
Image analysis
Histogram processing
For setting a threshold
382 31, 382 46, 382 33, 359107, 359561, G06K 974
Patent
active
050636022
ABSTRACT:
In an image correlation calculation apparatus for optically calculating correlations between reference patterns and an image such as a character or any other figure, the image such as the character or any other figure subjected to correlation calculations is optically multiplied by a multiplier to form simultaneously in parallel a plurality of optical pattern images of a substantially identical shape, and optical correlation calculation between the plurality of optical pattern images and the reference patterns formed on various types of reference masks is performed individually and instantaneously, the various type of reference masks being arranged at a position spaced apart by a predetermined distance from the plurality of optical pattern image, thereby detecting beams emitted through the various types of reference masks. Image multiplication, optical correlation calculation, and transmission of the result of the optical correlation calculation to the photosensors can be simultaneously performed at a light propagation time. The apparatus structure can be simplified at low cost, and image correlation operations can be performed at high speed.
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Nishi Hisami
Peppers Norman A.
Pierce Gerald A.
Young James R.
Nippon Sheet Glass Co. Ltd.
Razavi Michael
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