Image analysis – Histogram processing – For setting a threshold
Patent
1988-04-19
1990-07-10
Eisenzopf, Reinhard J.
Image analysis
Histogram processing
For setting a threshold
382 50, 382 18, 382 27, G06K 939
Patent
active
049411926
ABSTRACT:
In a method of recognizing a pattern of a gray level image the image to be processed is subjected to a normalization process, local gray level feature parameters are extracted from the normalized image at its sampling points, and the pattern is identified by using the extracted feature parameters in accordance with a predetermined recognition procedure. An apparatus for recognizing a pattern of a gray level includes a memory for storing a gray level image having several brightness tone levels, a normalization circuit for normalizing the brightness of the gray level image to be processed, an extraction circuit for extracting local gray level feature parameters from the obtained normality image at specific points, and a recognition circuit for identifying the pattern by using the feature parameters in accordance with a predetermined.
REFERENCES:
patent: 3534332 (1970-10-01), Parks
patent: 4335427 (1982-06-01), Hunt
patent: 4543660 (1985-09-01), Maeda
patent: 4700400 (1987-10-01), Ross
patent: 4783838 (1988-11-01), Matsunawa
SAPIRSTEIN: "Improving Low-Illumination Video"-NASA Tech. Briefs-Spring 1979-p. 18-USCL 382/54.
Kanasaki Morio
Mishima Tadaaki
Ota Hideo
Takatoo Masao
Eisenzopf Reinhard J.
Hitachi , Ltd.
Solis Jose M.
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