Image analysis – Image compression or coding – Quantization
Patent
1996-08-08
1998-05-26
Stoll, Thomas L.
Image analysis
Image compression or coding
Quantization
382237, 358455, 358456, 358458, H04N 140
Patent
active
057579768
ABSTRACT:
An adaptive filtering and thresholding arrangement provides a set of error filters having different sizes and associated weighted coefficients for diffusing quantization errors among neighboring pixels in predetermined tonal areas of an image to achieve a smooth halftone image quality. Each error filter circuit is optimally applied to a particular pixel area depending upon the grayscale tone of that area and the desired output print resolution. The arrangement further provides for the addition of "noise" errors to threshold values at selected input image pixel ranges and at the intersection of two differently filtered areas to eliminate visible pattern distortion.
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Janofsky Eric B.
Seiko Epson Corporation
Stoll Thomas L.
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