Compression ratio pre-dispensation algorithm for multi-tiles images in JPEG2000

The problem that JPEG2000 fails to specify how to allocate the specific compression ratio among image tiles is analyzed in detail, and a compression ratio-pre-dispensation algorithm based on the information of each image tile is presented. The prediction and edge detection modules are firstly used to estimate the inner information of an image tile. Several different methods of image information measurement are discussed and compared. With a large number of experimental results, it is shown that the quality of the reconstructed image is greatly improved, and for some specific images whose object has the characteristic of precinct convergence, the result could be incredibly better than expected. For the hardware implement of JPEG 2000, JPEG-LS, PNG, the small edge detection module can meet the standard of high-speed and high-performance.