Adaptive quantization controlled by scene change detection

Details Adaptive quantization controlled by scene change detection Adaptive quantization controlled by scene change detection

1994-09-30

1996-12-31

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348700, H04N 732

Patent

active

055898840

ABSTRACT:
A picture transmission system for compressing picture information to transmit compressed picture information is provided. The picture transmission system includes, on the transmitter side, circuitry for realizing scene change detecting function. This circuitry comprises a buffer memory for storing picture signal of one frame to output it in order of luminance signal Y, and chrominance signals C.sub.B, C.sub.R ; a frame memory for storing picture signal of the former frame delivered from the buffer memory; a subtracter for performing, every corresponding pixels, subtractive operation between picture signal of one frame inputted from the buffer memory and the picture signal of the former frame read out from the frame memory to take out value of difference; a numeric value converter for binarizing the value of difference with a threshold value set in advance being as boundary; a counter for counting the number of one values of the binarized values to store the count value; a CPU for calculating change rate of picture on the basis of the count value read out from the counter; and a coding controller for converting the numeric value calculated by the CPU into a control signal in accordance with a function set in advance to control quantization level of the video encoder by the control signal.

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patent: 5223949 (1993-06-01), Honjo
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patent: 5398078 (1995-03-01), Masuda et al.
patent: 5455561 (1995-10-01), Brown
patent: 5461679 (1995-10-01), Normile et al.

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