For reducing the errors which arisen during Hamming error correcting decoding so that the likelihood of mistakenly and randomly rectifying is cut down and the quality of restored image is improved

an improved algorithm of restoring image based on Hamming error correcting codes is presented. This algorithm first divides the most significant bit (MSB)plane of a grayscale image into four big blocks.Then each big block is divided into four small blocks and they are exchanged vertically in a big block.Secondly

the four binary bits at the same pixel position of four big blocks are encoded according to (7

4) Hamming encoding and the three checkout bit plane big blocks are implemented with diagonal exchanging in itself

then the exchanged three big blocks are embedded into the least significant bit(LSB) of corresponded pixel of the first three big blocks of the original image orderly according to checkout bit sequence.Then the second most significant bit plane(2MSB) and the third one(3MSB) are operated using above algorithm and embedded respectively into the second least significant bit plane(2LSB) and the third one(3LSB). The experiment results indicate that the improved method has obtained better restored image effect than the original one in the circumstance of cutting

replacing

average filtering and median filtering

and JPEG lossy compression.And the noise caused by the restored algorithm is reduced largely.