Document enhancement via binary to gray-scale iterative stack filters

Ronald E. Jodoin; Robert P. Loce; R. Victor Klassen

doi:10.1117/12.205228

28 March 1995 Document enhancement via binary to gray-scale iterative stack filters

Ronald E. Jodoin, Robert P. Loce, R. Victor Klassen

Proceedings Volume 2424, Nonlinear Image Processing VI; (1995) https://doi.org/10.1117/12.205228
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

One form of digital document enhancement maps a binary image to N-bits/pixel while maintaining constant spatial sampling resolution. Pixels in character stroke interiors and in the background typically retain black or white values, while certain edge pixels map to intermediate `gray' levels, effectively lessening the jagged appearance of curved and angled strokes. This paper presents a binary-to-gray operator that employs binary erosion-based filters in an iterative stacking architecture. We describe the filter architecture, optimal design method, and demonstrate binary-to-gray enhancement using only a small number of morphological erosions.

Citation Download Citation

Ronald E. Jodoin, Robert P. Loce, and R. Victor Klassen "Document enhancement via binary to gray-scale iterative stack filters", Proc. SPIE 2424, Nonlinear Image Processing VI, (28 March 1995); https://doi.org/10.1117/12.205228

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