Edge-preserving prefiltering for document image binarization

We propose a novel coplanar filter, which exploits the coplanarity of gray-level distribution of neighboring pixels, to pre-filter the document images. Experiments show that the proposed filter exhibits the following desired properties for document image binarization: (1) impulsive noise removal, (2) piecewise smoothing, and (3) sharp edge preservation.

• Type: Conference
• Year: 2001
• Where: ICIP
• Authors: Liying Fan, Chew Lim Tan, Lixin Fan
• Keywords: ICIP 2001, Image Processing, Impulsive Noise Removal, Sharp Edge Preservation