Improved halftone detection method in digital document reproduction

Jeng-Nan Shiau

doi:10.1117/12.175320

9 May 1994 Improved halftone detection method in digital document reproduction

Jeng-Nan Shiau

Proceedings Volume 2171, Color Hard Copy and Graphic Arts III; (1994) https://doi.org/10.1117/12.175320
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

Abstract

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.

Citation Download Citation

Jeng-Nan Shiau "Improved halftone detection method in digital document reproduction", Proc. SPIE 2171, Color Hard Copy and Graphic Arts III, (9 May 1994); https://doi.org/10.1117/12.175320

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