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Foil 31 Wavelets -- Quantization (2)

From CPS600 Compression Presentation CPS600 Spring 1995 -- March 1995. by Roman Markowski and Geoffrey Fox * Critical Information in IMAGE
we can eliminate (set to zero) these coefficients with small magnitudes without creating significant distortion in the reconstructed image
energy invariance
  • total amount of energy in the image does not change when the wavelet transform is applied
  • any change to wavelet coefficients will result in proportional changes in the pixel values of the reconstructed image
we can eliminate all but a few percent of wavelet coefficients
thresholding function - amount of compression controlled by "t" parameter

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