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AssigneeVianet Technologies, Inc.
InventorsHongyang Chao, Howard P. Fisher, Paul S. Fisher, Zeyi Hua
Estimating the term…
A wavelet-based image compression system and method are presented. Compression is accomplished by performing a wavelet transformation of an input digital image. The resulting wavelet coefficients are compared to a threshold value. Coefficients falling below the threshold are discarded. The remaining coefficients are quantized. The quantized coefficients are then compressed using an entropy encoding technique, such as arithmetic, run length, or Huffman encoding, or a combination of Huffman and run length encoding. The wavelet transform can be an integer wavelet transform derived using a lifting scheme or correction method, while the quantization scheme can be sub-band oriented. Input color image pixels can be reduced using a color table. In addition, color pixels can be transformed between color spaces prior to wavelet transformation.
An image compression system, comprising:
An image decompression system, comprising:
A computer-readable memory storing a computer program for directing a computer system to perform image compression, wherein the computer program implements the steps for performing integer wavelet transformation of an input image having a finite number of bits per pixel, quantizing the wavelet transformed image, applying entropy coding to the quantized image, and outputting a file that includes the entropy coded image, wherein the integer wavelet transform used modular arithmetic and wavelet coefficients of the wavelet transformed image have no more finite number of bits than do any of the pixels of the input image.
Dependencies are inferred from the claim text.