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• W2024952661 abstract "This paper presents novel coding algorithms based on tree-structured segmentation, which achieve the correct asymptotic rate-distortion (R-D) behavior for a simple class of signals, known as piecewise polynomials, by using an R-D based prune and join scheme. For the one-dimensional case, our scheme is based on binary-tree segmentation of the signal. This scheme approximates the signal segments using polynomial models and utilizes an R-D optimal bit allocation strategy among the different signal segments. The scheme further encodes similar neighbors jointly to achieve the correct exponentially decaying R-D behavior (D(R)/spl sim/c/sub 0/2/sup -c1R/), thus improving over classic wavelet schemes. We also prove that the computational complexity of the scheme is of O(NlogN). We then show the extension of this scheme to the two-dimensional case using a quadtree. This quadtree-coding scheme also achieves an exponentially decaying R-D behavior, for the polygonal image model composed of a white polygon-shaped object against a uniform black background, with low computational cost of O(NlogN). Again, the key is an R-D optimized prune and join strategy. Finally, we conclude with numerical results, which show that the proposed quadtree-coding scheme outperforms JPEG2000 by about 1 dB for real images, like cameraman, at low rates of around 0.15 bpp." @default.
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• W2024952661 date "2005-03-01" @default.
• W2024952661 modified "2023-10-17" @default.
• W2024952661 title "Rate-distortion optimized tree-structured compression algorithms for piecewise polynomial images" @default.
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• W2024952661 doi "https://doi.org/10.1109/tip.2004.840710" @default.
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