图像的方块编码（BCT），通过不同大小子块3*、5*5、7*7对图像分块，经过阈值判断，统计特性判断、进行编码-Box of the image encoding (BCT), by the different sizes of sub-block 3* 5* 5,7* 7, the image block with the judgment of the threshold, statistical characteristics of judgment