Signal-processing device

Details Signal-processing device Signal-processing device

1984-12-03

1988-02-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, 358298, H04N 140

Patent

active

047244887

ABSTRACT:
A signal-processing device for transforming a digital image signal, that has been obtained by sampling and digitization of a video signal obtained by line-wise scanning of an original, to a binary image signal wherein zero points of the two-dimensional second difference of the digital video signal are determined in order to detect contrast transitions in the original. Unwanted noise components in the video signal are eliminated by masking the second-difference signal.

REFERENCES:
patent: 4575768 (1986-03-01), Sakai et al.

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