Dynamic stack data compression and decompression system

Details Dynamic stack data compression and decompression system Dynamic stack data compression and decompression system

H - Electricity

04

N

350/7

H04N 1/41 (2006.01) G06T 9/00 (2006.01) H03M 7/42 (2006.01) H04N 1/417 (2006.01)

Patent

CA 1175138

DYNAMIC STACK DATA COMPRESSION AND DECOMPRESSION SYSTEM Abstract A system for encoding images by assigning variable- length code words to fixed positions in a dynamic stack. Each position in the dynamic stack is occupied by a representation of an encodable image feature, such as a run-length or a vertical correlation. These codes are arranged in order of their respective frequencies of occurrence. The order in which these features are stacked is varied dynamically by the system, in accordance with their respective frequencies of occurrence and a predeter- mined scheme. Thus, the system can adapt to different types of documents being scanned, or to changes of scanning resolution. A relationship exists between the code words and the stack positions, which are not permanently assigned to specific image features. This arrangement ensures that the lengths of code words will be inversely related to their frequencies of occurrence under all conditions.

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