Proceedings PaperImproved halftone detection method in digital document reproduction
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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.