http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
곽노윤(Kwak No Yoon),황병원(Hwang Byong Won) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.8
In this paper, a variable motion estimation scheme based on HBMA(Hierarchical Block Matching Algorithm) to improve the performance and to reduce heavy computational and transmission load, is presented. The proposed algorithm is composed of four steps. First, block activity for each block is defined using the edge information of differential image between two sequential images, and then average block activity of the present image is found by taking the mean of block activity. Secondly, camera pan compensation is carried out, according to the average activity of the image, in the hierarchical pyramid structure constructed by wavelet transform. Next, the LUT classifying each block into one among Moving, No Moving, Semi-Moving Block according to the block activity compensated camera pan is obtained. Finally, as varying the block size and adaptively selecting the initial search layer and the search range referring to LUT, the proposed variable HBMA can effectively carries out fast motion estimation in the hierarchical pyramid structure. The cost function needed above-mentioned each step is only the block activity defined by the edge information of the differential image in the sequential images.
디지털 영상 확대를 위한 적응형 Pseudomedian 필터의 설계 및 성능 분석
곽노윤 ( No Yoon Kwak ),황병원 ( Byong Won Hwang ) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.4
It is known that a digital image enlargement technique can increase the size of the image but the practical enhancement of resolution is trifle because the frequency bandwidth of the original image is basically limited. To solve this problem, this paper proposes the digital image enlargement technique which interpolates the interpolation points of honzontal and vertical direction by weighting according to the direction of edge information with the component of FOI(Filst Order Interpolation) and output of the pseudornedian hiter for image enlargement and interpolates the interpolation points of diagonal direction by selectiveIy transposing the direction of the subwindows of the pseudornedian inter accordding to the distribution of neighbored pixels thereto in the extanded image. Accordding to the proposed metheds, the digital image enlargement which preserves the characteristic of the pseudornedian filter capable of keeping the reconstruction of edge information and ref1ects the advantage of FOI can be performed. Therefore, visual artifacts could be effectively suppressed, and most characteristics and shapes of the original image call be reconstructed as well.