Method of enhancing border of region included in image

Details Method of enhancing border of region included in image Method of enhancing border of region included in image

1989-07-14

1991-08-06

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

362 52, 362 32, 362 27, G06K 940, G06K 938, G06K 956, G06K 974

Patent

active

050383876

ABSTRACT:
Preliminary sharp signals S.sub.0, S.sub.45, S.sub.90 and S.sub.135 are generated based on the shapes and directions of long regions R.sub.0, R.sub.45, R.sub.90 and R.sub.135 respectively. Then differences between the preliminary sharp signals S.sub.0, S.sub.34, S.sub.90 and S.sub.135 and an unsharp signal U are obtained and the difference which has the maximum absolute value is selected as a detailed original signal. A detailed signal is generated by multiplying the detailed original signal by a predetermined coefficient K. A sharp signal S added with the detailed signal and thereby an enhanced pixel data S.sub.N is generated.

REFERENCES:
patent: 4317179 (1982-02-01), Kato et al.
patent: 4672463 (1987-06-01), Tomohisa et al.
patent: 4817180 (1989-03-01), Cho et al.
patent: 4903316 (1990-02-01), Hongo et al.
patent: 4941190 (1990-07-01), Joyce

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