Authors
Abstract
The aim of this research is to investigate the performance of a suggested
image compression system. The scheme of the proposed system utilizes Tap 9/7
wavelet transforms to decompose the image signal, and then uses Discrete Cosine
Transform (DCT), and uniform quantization; to compress the approximate
coefficients. The detail coefficients are coded by hierarchical uniform
quantization, and then the original and modified Set Partitioning In Hierarchical
Tree (SPIHT) methods were applied on each color band separately. At the end
some spatial coding steps were applied on List of Significant Pixels (LSP) like
Run Length Encoding (RLE) and Shift Coding to gain more compression. The test
results indicate that the modified compression scheme shows a good performance
aspect in addition to its simplicity.
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