To improve the coding speed of set partitioning in hierarchical trees (SPIHT) algorithm, the structure of SPIHT was re-designed, a simple listless coding algorithm based on wavelet zerotree was developed. Pipeline coding structure was realized by pre-processing and main-processing processes and access frequency was reduced. Pre-processing was designed to mark the significance of all nodes and main-processing to finish listless zerotree coding. In color image coding, the transform from RGB(red-green-blue) space to YUV (luminance-chrominance) space was performed, YUV color planes was correspondingly coded on bit plane sorting. So, the output coding stream was fully embedded. Generally, the first significant bit plane of luminance component is higher than chrominance component's. The performance of color image coding is further improved by output-controlled policy of chrominance component. Hardware implementation results show that the speed of codec is improved significantly, but rate-distortion performance is not reduced. The new algorithm is especially suitable for high resolution or irregular image codec chip design.
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