Il-hong Shin

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In the incoming amendment of H.264/AVC for scalable video coding (SVC), down and up-samplings in a spatial domain are incorporated for spatial scalability. A new two-fold up-sampling method is proposed for SVC. The proposed up-sampling method is based on a combination of the forward and backward type-II discrete cosine transform (DCT). As the proposed(More)
Wavelet-based resolution enhancement methods improve the image resolution by estimating the high-frequency band information. In this paper, we propose a new resolution enhancement method using inter-subband correlation in which the sampling phase in DWT is considered. Interpolation filters are designed by analyzing correlations between subbands having(More)
Video sequences usually have many scene changes and contain rapid motion. The coding efficiency of such sequences is generally low, and the image quality fluctuates. If the rapid motion and scene changes are taken into consideration for video compression, the compression performance can be improved and the fluctuation of image quality can be reduced. An(More)
Down-up sampling of images is an essential process for spatial scalability of the video coding standard. We propose an efficient down-up sampling method in spatial domain using DCT kernel. The computational complexity of the proposed method is reduced by taking advantages of various symmetries of the combined DCT kernel. The proposed down-up sampling method(More)
This paper proposes a transcoding method for frame rate reduction in H.264 video coding standard. H.264 adopts various block types and multiple reference frames for motion compensation. When frames are skipped to reduce frame rates in transcoder, it is not easy to estimate optimum motion vectors and block types in H.264. A simple and effective(More)
In a scalable video coding (SVC), spatial up-sampling of video sequences is an important process for spatial scalability. We propose an up-sampling method based on the type-1 DCT. For further improvement of the up-sampling method, we introduce an adaptive filtering method, which applies different weighting parameters to DCT coefficients. The proposed(More)
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