嵌入式DCT图像编码算法

Embedded DCT Image Coding Algorithm

首先对图像进行DCT ,然后把不同块中相同频率的DCT系数按照子块的顺序重新排列成 6 4个子带 重排后的DCT系数采用一种基于上下文的算术编码器进行位平面编码 ,从而使编码后的图像具有渐进传输性 实验证明 ,文中算法是一种简单。

The image is conventionally segmented into nonoverlapping 8×8 blocks, a discrete cosine transform (DCT) is applied, then the DCT coefficients are rearranged into 64 subbands in the order of block's position, for example, all DC coefficients with lowest frequency are contained in the upper left subband In order to exploit effectively the strong correlation of DCT coefficients in the neighbor blocks, the bit planes of the coefficients are encoded using context based arithmetic coding algorithm In addition, the use of bit plane coding ensures the progressive transmission of code stream, namely embedded encoding Experiment result shows that embedded discrete cosine transform (EDCT) is a simple and efficient image compression algorithm