Image analysis – Pattern recognition – Feature extraction
Patent
1996-04-22
1999-12-21
Au, Amelia
Image analysis
Pattern recognition
Feature extraction
348625, 382266, H04N 1409
Patent
active
060059753
ABSTRACT:
An improved circuit for compensating a pattern recognition type edge for a video signal processor which is capable of preventing a undershooting and an overshooting by recognizing a pattern of a luminance signal which is converted into a digital form when compensating an edge of a luminance signal, by substituting a sample value at incline start or end portions and at decline start or end portions of a pattern with the previous sample value or the next sample value, by generating a plurality of luminance signals having a different delay time by sequentially delaying a luminance signal which is converted into a digital form as many as the number of samples, by subtracting a luminance signal which is delayed by the previous process from the luminance signal which is delayed by each process, by recognizing a pattern of an edge of luminance signal by logically operating a difference signal and a reference signal after computing a plurality of difference signals, and by selecting a signal among luminance signals having a different delay time in accordance with the recognized pattern.
REFERENCES:
patent: 3980819 (1976-09-01), Schwartz
patent: 5194761 (1993-03-01), Smith
patent: 5293541 (1994-03-01), Ito
Au Amelia
LG Electronics Inc.
Prikockis Larry J.
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