전자공학회논문지B (Journal of the Korean Institute of Telematics and Electronics B)
- 제31B권2호
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- Pages.45-55
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- 1994
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- 1016-135X(pISSN)
블록단위의 프래탈 근사화를 이용한 영상코딩
Image Coding by Block Based Fractal Approximation
초록
In this paper, a block based image approximation technique using the Self Affine System(SAS) from the fractal theory is suggested. Each block of an image is divided into 4 tiles and 4 affine mapping coefficients are found for each tile. To find the affine mapping cefficients that minimize the error between the affine transformed image block and the reconstructed image block, the matrix euation is solved by setting each partial differential coefficients to aero. And to ensure the convergence of coding block. 4 uniformly partitioned affine transformation is applied. Variable block size technique is employed in order to applynatural image reconstruction property of fractal image coding. Large blocks are used for encoding smooth backgrounds to yield high compression efficiency and texture and edge blocks are divided into smaller blocks to preserve the block detail. Affine mapping coefficinets are found for each block having 16
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