Simplified EZW image coder with residual data transmission

Wavelet based compression is becoming popular due to its promising compaction properties at low bit rate. A zerotree wavelet image coding scheme efficiently exploits multi-level redundancy present in transformed data to minimize coding bits. In this paper, a new technique is proposed to achieve high compression by adding new zerotree and significant symbols to the original EZW coder. Contrary to four symbols present in the basic EZW scheme, the modified algorithm uses eight symbols to generate fewer bits for the given data. A subordinate pass of EZW is eliminated and replaced with fixed residual value transmission for easy implementation. This modification simplifies the coding technique as well and speeds up the process, retaining the property of embeddedness