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권효섭,조남익 한국통신학회 1997 韓國通信學會論文誌 Vol.22 No.4
In this paper, we propose a band stop filter(BSF) for reducing drag-like effect of the low pass filter(LPF), a block by block adaptive filtering method, and a motion adaptive filtering method, which show better results in terms of PSNR or human visual perception compared to the conventional method using LPF. The BSF improves the draglike effects of the low pass filter by passing temporal high frequency components of video sequences which correspond to objects with large motion. The proposed adaptive methods also improve the conventional adaptive filtering by modifying the conventional algorithm and applying the algorithms for small blocks. The simulation results show that the proposed filtering methods show better results in terms of PSNR and subjective tests in most cases. Also in case of block by block adaptive filtering, it is verified that the application of the algorithm for smaller block gives better results.
김종윤,박세준,권효섭,서동환,조웅호,김수중 경북대학교 전자기술연구소 2000 電子技術硏究誌 Vol.21 No.1
In this paper, it is proposed a modified optical shadow-casting system using one-dirrensional spatial encoding method. The proposed system, which is compared with a traditional optical shadow-casting system using geometrical optics, can reduce the spatial size by using a collimated light and aligning input patterns with decoding mask. These inert patterns and decoding masks are placed at a short distance regardless of a spatial distance between them.