| Summary: | 碩士 === 國立臺灣大學 === 資訊工程學研究所 === 89 === Broadband network environment is the ideal people seek, but the real network environment is consisted of channels have different capacity. In order to transmit image data in the real network environment, we want the compressed image bit stream can adjust bit rate according to the channel bandwidth. So we need progressive image codec.
In this thesis, we studied the architecture and theories of the more and more popular progressive image codec. First, the theory of wavelet transform is discussed and the implementation method using filer is explained. After doing wavelet transform, the codec system will transmit wavelet coefficients to SPIHT codec. Afterward we studied SPIHT algorithm and explained that SPIHT algorithm is a bit allocation strategy in essential. Then we comment that how the algorithm picked up important bits and produced the embedded bit stream to satisfy the need of different network environment.
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