Method and apparatus for prestoring dequantization information f

Details Method and apparatus for prestoring dequantization information f Method and apparatus for prestoring dequantization information f

1995-04-18

1998-07-21

Johns, Andrew W.

Image analysis

Image compression or coding

Including details of decompression

382245, 382246, 382250, 348426, G06K 936, G06K 946, H04N 1102

Patent

active

057844941

ABSTRACT:
A DCT VLC decoding method substantially lessens the computational burden of picture dequantization. The method of decoding variable length code (VLC) data includes the step of receiving a bitstream sequence organized into a hierarchy of levels including, in order, a sequence layer, a group of pictures layer, a picture layer, a slice layer, a macroblock layer, and a block layer. In the sequence layer, the method defines a quantization matrix. In a macroblock layer, the method defines a quantizer scale parameter in the macroblock layer, multiplies the quantization matrix times the quantizer scale parameter and stores the product in a quantization multiplication factor. In the block layer, the method parses an encoded data bitstream to detect a VLC code in the block layer and dequantizes the VLC code by multiplying the VLC code times the quantization multiplication factor.

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