Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1992-02-07
1996-07-23
Couso, Jose L.
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
382173, 382237, 382304, 358456, 358457, G06K 938, H04N 140
Patent
active
055398430
ABSTRACT:
An image processing system wherein for an inputted composite image composed of a line image and a dither image, both a line image processing and a dither image processing are carried out in parallel, and one of the processed results as selected in accordance with the image region discrimination result. The dither image processing is carried out through data conversion for calculating multivalued gray scale image from the inputted image data, gray scale data conversion for adjusting the gray scale image data so as to match an output device and obtaining such adjusted gray scale image data, and re-binarization for re-binarizing the gray scale image data after subjected to the gray scale conversion. The image region discrimination for discriminating if an image region is of a line image of a dither image is carried out based on a ratio of the number of black or white pixels within the region to the contour line length within the range. In ordered dither image through a screened type dither matrix is discriminated in accordance with a correlation between adjacent pixel trains each having a predetermined number of pixels.
REFERENCES:
patent: 4742556 (1988-05-01), Davis, Jr. et al.
patent: 4760463 (1988-07-01), Nonoyama et al.
patent: 4829587 (1989-05-01), Glazer et al.
Fujinawa Masaaki
Fujisawa Hiromichi
Kurosu Yasuo
Masuzaki Hidefumi
Murakami Tatsuya
Bella Matthew C.
Couso Jose L.
Hitachi , Ltd.
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