Removal of tile artifacts using projection onto scaling functions for JPEG2000

For practical image compression systems, handling images divided into independent tiles in the pixel domain is important. However, tiling introduces artifacts when transform coefficients are quantized The paper presents a "detiling" solution applicable to wavelet transform coefficients. The solution, called projection onto scaling functions, eliminates the blocking artifacts by computing approximations that match the smoothness of the compressed image inside a tile. This solution is applicable to any wavelet filter - extending previous work that applied only to a limited class of wavelet filters - and specifically targets decoding of JPEG2000 compressed images.