Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1995-11-02
1998-06-16
Boudreau, Leo
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
382172, 358464, 358465, 358466, G06K 938, G06K 900
Patent
active
057684413
ABSTRACT:
An image processing method and an image processing apparatus for determining the best digitizing threshold value, thereby enabling best-case digitizing across the entire input image, even when determination of a subject image within an image block is mistaken. The input image is separated into plural blocks; a temporary digitization threshold value is calculated for each of the separated blocks; the presence of text characters or other predetermined subject images is evaluated in each of the separated blocks; and block information for each of the separated blocks, including the temporary digitization threshold value, subject presence information, and the final digitization threshold value of each block for which said threshold value has been determined, is referenced to determine the final digitization threshold value for each block. Each block is then digitized using these best-case threshold values to achieve consistent, best-case digitization across the entire input image.
REFERENCES:
patent: 4731863 (1988-03-01), Sezan et al.
patent: 5351313 (1994-09-01), Bessho et al.
Kuwata Naoki
Yoshizawa Koichi
Boudreau Leo
Janofsky Eric B.
Johnson W. Glen
Mariam Daniel G.
Seiko Epson Corporation
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