전자공학회논문지B (Journal of the Korean Institute of Telematics and Electronics B)
- 제33B권11호
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- Pages.72-82
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- 1996
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- 1016-135X(pISSN)
신호 부공간 기법을 이용한 영상화질 향상
Image quality enhancement using signal subspace method
- 이기승 (연세대학교 전자공학과 음악, 음성, 및 신호처리 연구실) ;
- 도원 (연세대학교 전자공학과 음악, 음성, 및 신호처리 연구실) ;
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윤대희
(연세대학교 전자공학과 음악, 음성, 및 신호처리 연구실)
- Lee, Ki-Seung (A.S.S.P. Lab, Dept. of Electronic Engineering Yonsei University) ;
- Doh, Won (A.S.S.P. Lab, Dept. of Electronic Engineering Yonsei University) ;
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Youn, Dae-Hee
(A.S.S.P. Lab, Dept. of Electronic Engineering Yonsei University)
- 발행 : 1996.11.01
초록
In this paper, newly developed algorithm for enhancing images corrupted by white gaussian noise is proposed. In the method proposed here, image is subdivided into a number of subblocks, and each block is separated into cimponents corresponding to signal and noise subspaces, respectively through the signal subspace method. A clean signal is then estimated form the signal subspace by the adaptive wiener filtering. The decomposition of noisy signal into noise and signal subspaces in is implemented by eigendecomposition of covariance matrix for noisy image, and by performing blockwise KLT (karhunen loeve transformation) using eigenvector. To reduce the perceptual noise level and distortion, wiener filtering is implementd by adaptively adjusting noise level according to activity characteristics of given block. Simulation results show the effectiveness of proposed method. In particular, edge bluring effects are reduced compared to the previous methods.
키워드