한국정보처리학회논문지 (The Transactions of the Korea Information Processing Society)

한국정보처리학회 (Korea Information Processing Society)
권호 표지

DCT와 블록 계층 분할 유한상태 벡터 양자화를 이용한 영상 부호화

Image Coding Using DCT and Block Hierarchical Segmentation Finite-State Vector Quantization

  • 조성환 (동서울대학 전자계산기과) ;
  • 김응성 (경기공업대학 컴퓨터응용과)
  • 발행 : 2000.03.01
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초록

In this paper, we propose an algorithm which segments hierarchically blocks of image using discrete cosine transform(DCT) and execute finite-state vector quantization (FSVQ) for each block. Using DCT coefficient feature, image is segmented hierarchically to large smooth block and small edge block, then the block hierarchy informations are transmitted. The codebooks are respectively constructed for each hierarchical blocks, the encoder transmits codeword index using FSVQ for reducing encoded bit with hierarchical segmentation. Compared with side match VQ(SMVQ) and hierarchical FSVQ(HFSVQ) algorithm, about Zelda and Boat image, the new algorithm shows better picture quality with 1.97dB and 2.85 dB difference as to SMVQ, 1.78dB and 1.85dB diffences as to HFSVQ respectively.

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참고문헌

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