Motion compensation techniques in image sequence coding

Motion compensation nowadays plays an important role in image sequence coding, especially in low bit-rate image sequence coding such as video telephone and high definition TV. A number of motion estimation algorithms have been developed and can be roughly categorized as differential, pel-recursive, or block matching algorithms. These algorithms must, of course, be aided by some coding scheme to realize practical efficient image sequence coding, and, although transform coding is in many respects a successful image data compression technique, it has been shown to fail in further compressing motion compensated image data. The authors propose a motion compensated image sequence coding scheme with scene segmentation, post-estimation processing, and vector quantization, which reduces the bit rate of a 256×256 `Claire´ sequence to 0.4 bit per pixel (bpp) with excellent, and 0.1 bpp with good, picture quality