What is the difference between Wavelet algorithm and JPEG in compressing digital images?
Wavelet is more efficient than JPEG by 30-300%. Higher efficiency of Wavelet comes from its encoding method. Wavelet algorithm uses DWT(Discrete Wavelet Transform) while JPEG uses DCT(Discrete Consie Transform). Due to its efficiency, Wavelet is going to be adopted as standard in digital image compressing by JPEG2000. Since Wavelet is not yet standardized, it requires to install Plug-in or Active-X control to see images through standard Web browsers as Netscape and I-Explore. The size of Plug-in or Active-X control is as big as 3 MB. And the size of 3MB needs quite a long time to download. Therefore, Wavelet is not used commonly. However, WebGate Inc. has developed Plug-in or Active-X control of 300KB to prevent inconvenient time consumption from waiting.
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