Abstract
JPEG2000, a new still image compression standard, was approved by ISO in 2001. Because JPEG2000 is based on DWT (Discrete Wavelet Transform), block noises are greatly reduced, but the problem of mosquito noise is left unsolved. This paper proposes an algorithm which reduces the mosquito noises of JPEG2000 decoded images by using ε-filter. The variance values of brightness levels of picture elements within each block are calculated for every picture elements in an image, and the maximum value among them are used for the ε-filtering. Subjective image evaluation results show that the proposed algorithm can largely improve the image quality.
