The quantization method was applied to an existing embedded wavelet image coder and the compression results show that comparing with method without psychovisual quantization, this method gets better visual quality under the same compression ratio ( only with little peak signal noise ratio ( PSNR) degradation). 实验结果表明,与不采用心理视觉量化的压缩方法相比,在相同压缩比下,峰值信噪比略为降低,但恢复图像的主观质量有一定程度的改善。
The algorithm is based on the optimum quantization step for each DWT coefficient according to psychovisual considerations which derived from methods in image compression. 本文的算法基于图像压缩算法中利用心理视觉给出的DWT系数的最优量化步骤。