dwt based image compression
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sir how we can do quantization in image compression using dwt??
how can we compress image using dwt?
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Walter Roberson
2014-4-24
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Do the dwt. You will get a vector of coefficients as output. Store only the first 42 coefficients for each block, discarding the rest. The result will be a file that is 42 / (8*8) = 62.625% as large as the original image, because the original image had one coefficient for every pixel, 64 coefficients for each 8*8 block.
When you want to decompress, load the coefficients back in, storing the 42 coefficients into each 8 * 8 block, and set the "missing" (64-42 = 22) coefficients to 0. Then do the inverse dwt.
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2014-4-24
2014-4-24
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