基于小波变换的彩色图像RGB分量同分裂编码算法

Compression of color image with 2D wavelet transform by set-partitioning RGB color components synchronously

针对传统彩色图像编码算法没有充分利用彩色图像RGB色彩分量之间的相关性的缺点,在多级树分裂算法(SPIHT)的基础上提出RGB分量同分裂彩色图像编码算法。此算法充分利用RGB分量的相关性,将RGB分量看作是一个整体,利用SPIHT算法中的LIS链表,对它们同扫描,同分裂。生成的嵌入式码流在任意点中断时,解码出来的都是包含RGB三分量的彩色图像。实验结果表明,在相同压缩比下,此算法解码图像的PSNR一般比JPEG2000的高出0.1～0.7dB。

Concerning that the conventional color image coding algorithm does not take advantage of the dependency of the RGB color components,a new algorithm of set-partitioning RGB color components synchronously based on the Set Partitioning In Hierarchical Trees（SPIHT） algorithm was proposed.In this algorithm,RGB color components were treated as a whole,partition was sorted and set at the same time by using the same list of LIS.The color embedded bit-stream generated by this algorithm can stop at any point of the bit-stream and reconstruct the color image.The simulation results show the Peak Signal-to-Noise Ratio（PSNR） of the new algorithm on test images is about 0.1dB to 0.70 dB higher than JPEG2000＇s.