Picture encoding device for compressing picture data

Details Picture encoding device for compressing picture data Picture encoding device for compressing picture data

1997-01-23

2000-07-18

Williams, Kimberly A.

Image analysis

Image compression or coding

Lossless compression

348384, 348390, 358426, 358427, 358433, 382245, G06K 936, G06K 946, H04N 712, H04N 141

Patent

active

06091856&

ABSTRACT:
A picture encoding device for compressing picture data using the Huffman encoding system includes a grouping portion for recognizing a group to which an AC coefficient belongs, and a data processing unit receiving a run-length, a group number, and an additional bit, which are output from the grouping portion, for recognizing a ZRL* code and an effective coefficient. If the run-length group number (N/S) is an effective symbol, i.e., not a ZRL* code, the data processing unit transmits the effective symbol to a Huffman encoding portion in the next stage. If the N/S comprises a ZRL* code, a ZRL* code count detection counter is incremented. If an EOB* code follows a ZRL* code, ZRL* codes are deleted in a number corresponding to the count value from the ZRL* code count detection counter. The picture encoding device effectively carries out Huffman encoding without encoding unnecessary ZRL* codes in a Huffman encoding system.

REFERENCES:
patent: 5659362 (1997-08-01), Kovac et al.

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