Coded data generation or conversion – Digital code to digital code converters – To or from differential codes
Patent
1993-09-10
1996-04-23
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from differential codes
348409, 348415, H04N 1102
Patent
active
055107877
ABSTRACT:
Known systems based on layered coding and decoding do not take account of the greater surface area of an HDTV picture, which is to be coded with high resolution, compared with the smaller surface area of a conventional picture, to be derived therefrom, which is to be coded with low resolution. An improvement in the efficiency of the coding and decoding is achieved by actually taking account of this with the system according to the invention and maintaining the coupling between the two layers in the encoder and the decoder if a picture element is situated in a corresponding section of the two pictures and interrupting the coupling if a picture element is situated outside the corresponding section of the two pictures.
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Hoff Marc S.
Koninklijke PTT Nederland N.V.
Michaelson Peter L.
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