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Frequency scanning in digital coding for HDTV broadcasting
This paper describes an algorithm for frequency scanning of DCT coefficients which has been submitted to MPEG (Motion Picture Experts Group) in contrast to the well-known block scanning technique. With respect to coding of the scanned coefficients, an entropy coding method, Modified Universal Variable Length Coding (MUVLC), is employed. In the test model (TM) system of MPEG the coding efficiency of MUVLC and the MPEG VLC was compared. The results showed that the MUVLC technique gives higher coding efficiency and more flexibility in a broadcast environment.