To enable optimal reproduction of a compound document containing both text and halftones, it is necessary to identify the halftone regions of the document and process them separately from the text and line arts portion. A technique for halftone detection using the auto correlation of the video stream has been improved to reduce the false classification of small kanji and to enable detection of non-45-degree screens. Typical examples of the detection map and the processed images are presented.
Improved halftone detection method in digital document reproduction
Color Hard Copy and Graphic Arts III ; 1994 ; San Jose,CA,United States
Proc. SPIE ; 2171
1994-05-09
Conference paper
Electronic Resource
English
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