Method and apparatus for encoding, decoding image based on region of interest

The invention generates a variable overlap with the data of the region of interest according to the characteristics of the image, or relates to a non by reducing the data of the region of interest to increase the error occurs, the restoring force of interest based on the image encoding and decoding method and apparatus, according to the invention region of interest-based image encoding method and apparatus which calculates the complexity of each block located in a region of interest of the image, and then, the block of the region of interest blocks of the region of interest has a greater complexity is creating more duplicate blocks and having a small complexity is more there is featured in that for coding the converted image by generating less redundant block.