Fast approximation of DCT kernel in JPEG

In this paper a new approach to the approximation of Modified Integer Cosine Transform (MICT) without multiplication will be introduced. An application of this method in JPEG standard for a compression of images is analysed and discussed. An error analysis of the approximation shows very good results. Nevertheless, an accuracy of the algorithm vs. speed can be very easily optimised. Combination of standard JPEG and JPEG based on proposed algorithm has been analysed. An example at the end of this paper shows practical experience with the method.