A new improvement of SPIHT progressive image transmission

To generate optimal transmission quality for images, we present a new technique to improve the progressive image transmission (PIT) of SPIHT. The original approach about the progressive image transmission is that SPIHT regards the bit streams acquired from every truncation as a transmission in every phase; in every truncation, SPIHT not only refine the significant coefficients from this truncation but also re-refine the significant coefficients extracted from the previous phases. These refinements and re-refinement are not worth in many situations. The method we introduced is that, in some transmission phases, the refined and re-refined bit streams will not be transmitted immediately and will be replaced by the bit streams derived from the significant coefficients of the next truncation. These refined bit streams will be sent late. According to the experimental results, the new method has the better image quality in each PIT phase than the original SPIHT.