Television – Bandwidth reduction system – Data rate reduction
Patent
1996-03-14
1998-05-12
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348400, 348401, 348404, 348419, 375244, 375245, H04N 0730
Patent
active
057513597
ABSTRACT:
A method for encoding a 10-bit based picture using a circuitry or devices inherently designed for handing an 8-bit based picture. The 10-bit based input picture data is motion-compensated with 8 bits in a motion compensation circuit. From the motion-compensated picture data, representative value data and the quantization width are found by an in-bloc representative value calculation circuit and a block quantization width calculation circuit, respectively. A difference between the picture data and the representative value data is found by an adder. The difference is sent to a block quantizer where first 8-bit quantized data is generated on the basis of the quantization width so that the representative value is at a mid point of the quantization width. The first quantized data is transformed by a discrete cosine transform circuit of a difference signal encoder to generate transform coefficients which are quantized by a quantizer to generate second quantized data. A variable length encoding circuit encodes the representative value data, quantization width and the second quantized data. The 10-bit based picture can be encoded by the circuitry or the devices designed for an 8-bit based picture without substantially deteriorating the picture quality.
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Suzuki Teruhiko
Yagasaki Yoichi
Chin Tommy P.
Frommer William S.
Snow Frank
Sony Corporation
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