Television – Bandwidth reduction system – Data rate reduction
Patent
1993-11-24
1996-10-22
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348390, 348397, 348415, 348406, 348402, H04N 712
Patent
active
055681999
ABSTRACT:
A video signal of one field is applied to a high frequency component measuring device which measures the high frequency component strength Q of the image of the video signal. The video signal of one field is also applied to a field memory. A look-up table memory carries a plurality of quantization tables each containing parameters. The parameters are aligned in a matrix format in the quantization table. The strength Q is used for selecting one quantization table which is appropriate for reducing the size of coded video signal. A JPEG compression device compresses the video signal from the field memory by DCT operation to produce compressed signal, which is an alignment of a plurality of coefficients aligned in a matrix format. The coefficients are divided by corresponding parameters in the selected quantization table to reduce the size of the compressed signal.
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Kajimoto Kazuo
Kanno Kinya
Tsubota Rumi
Chin Tommy P.
Matsushita Electric - Industrial Co., Ltd.
Rao Anand S.
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