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本文提出了一种采用5 bit量化器的自适应方块图象编码方案。用此方案对“男孩和玩具”和“RMA测试卡”两幅图象中轮廓丰富的部分进行了计算机模拟实验。结果表明:信噪比均在34.45dB以上,平均比特率在3.12 bit/pel以下。比性能较好的一种简单的自适应方块图象编码方案信噪比提高1～3 dB,比特率下降0.3～0.6 bit/pel左右。主观实验表明,复原图象与原始图象相比,看不出明显的差别。
This paper presents an adaptive 5-bit quantizer image coding scheme. Using this scheme, computer simulation experiments were carried out on the outline-rich parts of “Boy and Toy” and “RMA Test Card” images. The results show that the SNR is above 34.45dB and the average bit rate is below 3.12 bit / pel. A simple and adaptive block image coding scheme with better performance than the proposed scheme can improve signal-to-noise ratio by 1 ~ 3 dB and bit rate by 0.3 ~ 0.6 bit / pel. Subjective experiments show that there is no obvious difference between the reconstructed image and the original image.