Image data compression apparatus

Details Image data compression apparatus Image data compression apparatus

1990-01-30

1991-09-03

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 27, 382 43, 356426, G06K 900

Patent

active

050461214

ABSTRACT:
An image data compression apparatus, in that a component characteristic value of an AC component in a block obtained by dividing digital tonal image data is compared with a predetermined threshold value so that a frequency of an AC component at the highest frequency side having the component characteristic value over the threshold value is determined as a boundary value, and in that the AC component exceeding the boundary value is not handled as a substantial transform coefficient. When the transform coefficients in a high-frequency side in the block is cut according to an image content of the block a lower limit of a frequency to be cut is determined, so that a frequency lower than the lower limit determined may not be cut.

REFERENCES:
patent: 4751742 (1988-01-01), Meeker
patent: 4802232 (1989-01-01), Altes

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