Compressed Domain Image Enhancement

Image enhancement is basically a task of applying certain transformations to an input image such that the resultant image should be more pleasant, more detailed or less noisy. In this paper an image enhancement algorithm for compressed images using the JPEG standard is presented. The basic idea of proposed algorithm is to filter the image by manipulating the DCT coefficients according to the contrast measure defined. If the enhancement is done before compression, it will reduce the compressibility of the original image. Compressed domain enhancement approach does not affect the compressibility of the original image. This also reduces storage requirements and computational complexity.