منابع مشابه
Improved Chen-Smith image coder
An image compression system based on transform coding and zonal sampling is presented. It is based on the wellknown Chen-Smith coder, but with an improved technique for transform coefficient quantization and the replacement of the discrete cosine transform (DCT) by the lapped orthogonal transform (LOT). The system leads to signal-to-noise ratios that are from 1.5 to 2.0 dB above those obtained ...
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Oprea proves that Ric(X) ≤ n−1 4 (c + n||H||) improving the Chen-Ricci inequality for Lagrangian submanifolds in complex space forms by using an optimization technique. In this article, we give an algebraic proof of the inequality and completely classify Lagrangian submanifolds in complex space forms satisfying the equality, which is not discussed in Oprea’s paper.
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The Set Partitioning in Hierarchical Trees (SPIHT) approach for still image compression is one of the most efficient embedded gray image compression schemes till date. The algorithm relies on a very efficient scanning cum bit-allocation scheme for quantizing the coefficients obtained by a wavelet decomposition of an image. In this paper, modifications of the SPIHT compressor without arithmetic ...
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A new quadtree-based lossy image compression algorithm is introduced. One new feature is that one pixel in each quadtree block is predictively encoded while the remaining pixels are linearly predicted from this one and from pixels of previous blocks. Another is that the criteria for subdividing a block involves the reproduction error in each pixel, as opposed to the error energy for the entire ...
متن کاملImprove Image Quality Using Hybrid Wavelet Fractal Image Coder
In this paper, the transformation function used in fractal image compression is chosen in such a way that its unique fix point is a close approximation of the input image. Compression occurs because storing the details of the image transform also known as encoding takes up much less space than the original image. Decompression or decoding involves applying the transform repeatedly to an arbitra...
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ژورنال
عنوان ژورنال: Journal of Electronic Imaging
سال: 1995
ISSN: 1017-9909
DOI: 10.1117/12.199434