一种高效的矢量量化码本生成算法

H. B. Kekre, T. Sarode
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引用次数: 77

摘要

本文提出了一种简单而有效的生成码本的算法。该算法采用排序法生成码本,采用中值法获得码向量。在6张大小为512 × 512的不同图像上进行了实验,生成了4个大小分别为128、256、512和1024的不同码本。实验结果表明,该算法比LBG和KPE算法快得多。从MSE、PSNR和执行时间等方面考虑,该算法的性能优于LBG和KPE算法。对于大小分别为128、256、512和1024的码本,与LBG相比,该算法给出的MSE更小。对于各种大小的码本,它也提供了比LBG更高的PSNR。
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An Efficient Fast Algorithm to Generate Codebook for Vector Quantization
In this paper we present a very simple and yet effective algorithm to generate codebook. The algorithm uses sorting method to generate codebook and the codevectors are obtained by using median approach. The proposed algorithm was experimented on six different images each of size 512 x 512 and four different codebooks of sizes 128, 256, 512 and 1024 are generated. The proposed algorithm is found to be much faster than the LBG and KPE algorithm. The performance of this algorithm is better than LBG and KPE algorithms considering MSE, PSNR and execution time. The proposed algorithm gives less MSE as compared to the LBG for the codebooks of sizes 128, 256, 512 & 1024 respectively. It also gives higher PSNR as compared to LBG for the codebooks of various sizes.
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