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Effective Morphological Layer Segmentation Based on Edge Information for Screen Image Coding

스크린 이미지 부호화를 위한 에지 정보 기반의 효과적인 형태학적 레이어 분할

  • 박상효 (한밭대학교 정보통신전문대학원) ;
  • 이시웅 (한밭대학교 정보통신전문대학원)
  • Received : 2013.09.05
  • Accepted : 2013.10.22
  • Published : 2013.12.28

Abstract

An image coding based on MRC model, a kind of multi-layer image model, first segments a screen image into foreground, mask, and background layers, and then compresses each layer using a codec that is suitable to the layer. The mask layer defines the position of foreground regions such as textual and graphical contents. The colour signal of the foreground (background) region is saved in the foreground (background) layer. The mask layer which contains the segmentation result of foreground and background regions is of importance since its accuracy directly affects the overall coding performance of the codec. This paper proposes a new layer segmentation algorithm for the MRC based image coding. The proposed method extracts text pixels from the background using morphological top hat filtering. The application of white or black top hat transformation to local blocks is controlled by the information of relative brightness of text compared to the background. In the proposed method, the boundary information of text that is extracted from the edge map of the block is used for the robust decision on the relative brightness of text. Simulation results show that the proposed method is superior to the conventional methods.

Keywords

Screen Image Coding;MRC Model;Morphological Layer Segmentation

Acknowledgement

Supported by : 한국연구재단

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