Apparatus for controlling a quantization level to be modified by

Details Apparatus for controlling a quantization level to be modified by Apparatus for controlling a quantization level to be modified by

1993-11-26

1996-04-16

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348699, 348405, 348416, H04N 730, H04N 732

Patent

active

055087450

ABSTRACT:
A motion vector calculating device receives horizontal and vertical components of a motion vector and calculates the magnitude of the motion vector. A motion estimating device then compares the magnitude of the motion vector with stored reference values. A quantization level modifying device in turn provides a real quantization level signal taking into consideration man's visual perception characteristic and the fullness of a buffer in the data transmission path. Accordingly, the quantization level is enhanced for larger moving parts of the picture while the quantization level is reduced for parts of the picture containing less motion, thereby allowing the signal being quantized to be further compressed.

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