Television – Bandwidth reduction system – Data rate reduction
Patent
1993-02-26
1996-09-03
Tran, Thai Q.
Television
Bandwidth reduction system
Data rate reduction
348392, 348395, 348397, 348405, 348420, 348421, H04N 726, H04N 730
Patent
active
055528295
ABSTRACT:
An image signal coding system encodes analog image signals into digital signals in a high-definition digital video tape recorder (D-VTR). A scrambling portion rearranges the image data of a frame formated in the order of vertical subsampling line into a predetermined unit of blocks to distribute the highly variable portions and substantially linear portions in the image data uniformly, while an activity calculation portion calculates a horizontal projection sum and a vertical projection sum of discrete coding transform factors in a unit block and a block activity, respectively to determine a coding area and a quantization step size. An adaptive scanning portion adaptively scans the quantized data in accordance with the coding area determined by the activity calculation portion and a sequential transmission portion sequentially transmits the data coded by a variable length coding in conforming with a predetermined transmitting bit rate in a unit of a fixed length, wherein a block having an underflow producted therein is added with 0 and transferred, while a block having an overflow produced therein is transmitted with only an amount of data coincided with the transfer bit rate.
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Chung Tae Y.
Kim Kye J.
Rao Anand S.
Samsung Electronics Co,. Ltd.
Tran Thai Q.
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