Extracting halftones from printed documents using texture analysis

Dennis F. Dunn, Thomas P. Weldon, William E. Higgins

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Separating halftones from text is an important step in document analysis. We present an algorithm that accurately extracts halftones from other information in printed documents. We treat halftone extraction as a texture-segmentation problem. We show that commonly used halftones, consisting of a pattern of dots, can be viewed as a texture. This texture exhibits a distinct spectral component that can be detected using a properly tuned Gabor filter. The Gabor filter essentially transforms halftones into high-contrast regions that can be easily segmented by thresholding. We propose a filter design procedure and provide experimental results.

Original languageEnglish (US)
Pages (from-to)1044-1052
Number of pages9
JournalOptical Engineering
Volume36
Issue number4
StatePublished - Apr 1 1997

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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