Method and apparatus for data encoding and data recording medium

Details Method and apparatus for data encoding and data recording medium Method and apparatus for data encoding and data recording medium

1995-03-30

1997-04-22

Boudreau, Leo

Image analysis

Image compression or coding

Lossless compression

382239, G06K 900

Patent

active

056235577

ABSTRACT:
A data encoding method apparatus in which the volume of arithmetic-logical operations for calculating the total number of bits required for encoding for adaptive bit allocation in the variable length encoding system for expediting the processing. In the data encoding apparatus for encoding and subsequently variable length encoding the input data, spectral data obtained on orthogonal transform coding are routed to a block floating circuit 403 for normalization and re-quantized in a quantization circuit 404 depending on the bit allocation number information from a bit allocation calculating circuit 406 so as to be then variable length encoded by an encoding circuit 407 and outputted at an output terminal 408. The bit allocation circuit 406 refers to a table memory circuit 409 in which re-quantized data domain is divided at boundary points corresponding to code length transitions in order to calculate the total number of bits required for encoding using a smaller volume of arithmetic-logical operations for the purpose of adjusting the number of allocated bits.

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