Television – Bandwidth reduction system – Data rate reduction
Patent
1992-12-16
1994-09-13
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348 27, H04N 7133
Patent
active
053473108
ABSTRACT:
Apparatus for compression encoding video signals, comprising block segmenting circuits for segmenting a vertical interval, such as a field or frame, of video picture elements into a plurality of blocks of picture elements. An orthogonal transformation, such as discrete cosine transformation, of respective blocks is obtained, resulting in a two-dimensional array of transform coefficients of different values, the array being partitioned into respective areas. Each area is quantized with a respective quantizing value that differs for different areas. Preferably, a transform coefficient is quantized by dividing the value of the transform coefficients in an area by a divisor 2.sup.n/2, where n is an integer that differs in different areas. The areas of the two-dimensional array of transform coefficients are formed by partitioning the array in a direction substantially perpendicular to the oblique frequency axis of that array.
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Okada Hiroshi
Yamada Takaaki
Yanagihara Naofumi
Chin Tommy P.
Frommer William S.
Lee Richard
Sinderbrand Alvin
Sony Corporation
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