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首页> 外文期刊>Journal of Harbin Institute of Technology >AN adaptive hybrid DPCM/DCT coding approach for high quality image compression
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AN adaptive hybrid DPCM/DCT coding approach for high quality image compression

机译：一种用于高质量图像压缩的自适应混合DPCM / DCT编码方法

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摘要

Discrete cosine transform (DCT) is the key technique in JPEG and MPEG, which deals with images block by block. However, this method is not suitable for the blocks containing many edges for high quality image reconstruction in particular. An adaptive hybrid DPCM/DCT coding method is proposed to solve this problem. For each block, the edge detector switches to DPCM or DCT coder automatically depending upon quality requirement. The edge blocks are coded by DPCM coder that adaptively selects a predictor from the given set, which results in minimum prediction error, and the residues obtained are coded with Rice code. For non-edge blocks, DCT, run-length and variable length coding (VLC) are applied. Experimental results showed that proposed algorithm outperforms baseline JPEG and JPEG lossless mode implementation both on compression ratio and decoding run-time at the bit rates from 1 to 4 approximately.
机译：离散余弦变换（DCT）是JPEG和MPEG中的关键技术，它逐块处理图像。但是，该方法特别不适用于包含许多边缘的块，尤其是用于高质量图像重建的块。为了解决这个问题，提出了一种自适应混合DPCM / DCT编码方法。对于每个块，边缘检测器会根据质量要求自动切换到DPCM或DCT编码器。边缘块由DPCM编码器编码，该DPCM编码器从给定集合中自适应地选择一个预测变量，从而将预测误差降至最低，并使用莱斯代码对获得的残差进行编码。对于非边缘块，将应用DCT，游程长度和可变长度编码（VLC）。实验结果表明，所提出的算法在压缩率和解码运行时间方面，均以大约1到4的比特率优于基线JPEG和JPEG无损模式实现。

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