The JPEG (Joint Photographic Experts Group) compression algorithm is possible to decode an image effectively, by considering the visual characteristic of human beings. However, the mosquito noise generates in the block, when a compression rate is high. It is lost to not only the mosquito noise but also important image information which constitutes an image, when the usual noise reduction filter was applied for an image including the mosquito noise. As the result, image quality falls off. Then, our proposed method is possible to restrain degradation of image quality, while reducing noise, by changing weight of filtering every block. We confirmed that our proposed method was effective by the computer experiment.
展开▼
