JADE-JPEG based adaptive document compression engine

A system for compressing a compound image, comprising:

• a block former for forming compound image data into a plurality of blocks;
• a first component for obtaining classifying data that designate one from a plurality of classes for each of a plurality of said blocks, based on predominate compression properties of the block;
• a second component, for each of a plurality of said blocks, obtaining transformed data therefor from either a lossy or a lossless transform selected based on the classifying data for the block;
• and
• a single entropy encoder for receiving the transformed data.

A program product including computer readable program code for compressing a compound image, comprising:

• first code for forming compound image data into a plurality of blocks;
• second code for obtaining classifying data that designate one from a plurality of classes for each of a plurality of said blocks, based on predominate compression properties of the block;
• third code, for each of a plurality of said blocks, obtaining transformed data therefor from either a lossy or a lossless transform selected based on the classifying data for the block;
• and
• fourth code for receiving and entropy encoding the transformed data.