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In lifting-based directional wavelet transforms, different subsampling patterns may show significant difference for directional signals in image coding. This paper investigates the influence of subsampling in directional wavelet transform. We show that the best subsampling depends on the direction and the directionality strength of the signal. To improve the coding performance, we further propose...
Traditional 2-D discrete cosine transform (DCT) implemented by separable 1-D transform in horizontal and vertical directions does not take image orientation features in a local window into account. To improve it, we propose to introduce directional primary operations to the lifting-based DCT and thereby derive a new directional DCT-like transform, whose transform matrix is dependent on directional...
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