Optical adaptive thresholder for converting analog signals to bi

Details Optical adaptive thresholder for converting analog signals to bi Optical adaptive thresholder for converting analog signals to bi

1993-08-04

1997-04-01

Coles, Sr., Edward L.

Image analysis

Image enhancement or restoration

Artifact removal or suppression

382255, 358445, 358465, 358448, 348572, 2502081, 2505781, H04N 140, H03M 112, G06K 940, H01L 2700

Patent

active

056174896

ABSTRACT:
An adaptive threshold for converting an analog video signal to a binary video signal. This video system employs two identical array sensors. These sensors are operated synchronously and each has its own lens. The lens of the primary array sensor is focused for a sharp image. The analog output of this primary array sensor is the primary video signal. A secondary array sensor is implemented with its lens intentionally set to some degree of defocus. This degree of defocus defines the adaptive threshold function, independent of the primary video. The analog output of this secondary array sensor is the adaptive threshold signal.

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"Digital Document Processing" by Hseih S. Hou.

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