Adaptive quantization of orthogonal transform coefficients for s

Details Adaptive quantization of orthogonal transform coefficients for s Adaptive quantization of orthogonal transform coefficients for s

1996-02-06

1999-08-10

Au, Amelia

Image analysis

Image compression or coding

Adaptive coding

348405, 3582612, 382245, 382250, 382251, G06K 936, G06K 946

Patent

active

059370980

ABSTRACT:
An image signal compressing device having a spatial frequency data amount setting unit and a quantization table generation unit. A set data amount is set in the spatial frequency data amount setting unit for each of a plurality of spatial frequencies based on a preset total data amount and a discrete cosine transformation (DCT) data statistical amount corresponding to quantized DCT coefficients using a quantization table in which all quantization coefficients are "1". An amount of encoded data obtained using a predetermined quantization coefficient is estimated in the quantization table generation unit. The predetermined quantization coefficient is adopted as a resultant quantization coefficient of the quantization table when the estimated data is not greater than the set data amount set in the spatial frequency data amount setting unit.

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