Image analysis – Histogram processing – For setting a threshold
Patent
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.
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patent: 4941190 (1990-07-01), Joyce
Cammarata Michael R.
Dainippon Screen Mfg. Co,. Ltd.
Razavi Michael
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