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本文讨论一种简单的自适应方块图象编码。它以4×4象素的方块编码为基础;而当方块内图象的边缘轮廓较多,使编码后的均方根误差大于某阈值时,则自适应地转换为2×2象素的方块编码。 对测试图象(抽样频率10MHz)进行的计算机模拟实验表明:当阈值TH=4时,则平均编码率低于3.2比特/象素,信噪比大于36dB;而复原图象的主观质量与原始图象相比,看不出明显的差别。
This article discusses a simple adaptive block image coding. It is based on a 4 × 4 pixel block coding, and when the edge of the image in the block has a large number of edges and the encoded root mean square error is greater than a certain threshold, it is adaptively converted into 2 × 2 pixels Box coding. Computer simulation of the test image (sampling frequency of 10MHz) shows that when the TH = 4 threshold, the average coding rate is less than 3.2 bits / pixel and the signal to noise ratio is greater than 36dB. The subjective quality of the restored image is similar to the original Compared with the image, there is no obvious difference.