Method and circuit for correction of horizontal edges

Details Method and circuit for correction of horizontal edges Method and circuit for correction of horizontal edges

1991-09-25

1992-09-22

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358162, H04N 5208

Patent

active

051502143

ABSTRACT:
A circuit for correcting horizontal edges in a digital image signal processing system, includes: three filtering circuits for filtering an input luminance signal to obtain a low frequency component, a medium frequency component and a high frequency component, respectively; three controller circuits for controlling gain of the low frequency component signal, the medium frequency component signal and the high frequency component signal on the basis of three corresponding control signals to produce three respective frequency signals and three mixing circuits for mixing the input luminance signal with the resepctive frequency signals to thereby produce an output luminance signal corrected in horizontal edges.

REFERENCES:
patent: 4414564 (1983-11-01), Hitchcock
patent: 4701793 (1987-10-01), den Hollander et al.
patent: 4789893 (1988-12-01), Weston
patent: 4825297 (1987-04-01), Fuchsberger et al.
patent: 4849826 (1989-07-01), Ohta

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