Abstract: In this paper, some improvements of the standard method for image sequence compression using Discrete cosine transform and motion compensation are described. The main improvements are realized by dividing the images into blocks of various size and by tuning the quantization matrices according to image activity. The realized signal to noise ratio was 37 to 39 dB at the bit rate of 0.3 bpp, what represents improvement of 2 to 4 dB over similar DCT-based methods.
Keywords: Image compression, DCT, Motion compensation, quantizer, signal to noise ratio.