The World According to Wavelets : The Story of a Mathematical Technique in the Making Reviewed by David Jerison

corporation in engineering standards for image compression. At high ratios (greater than 20:1 for gray scale) images computed using the standard compression method (a discrete cosine transform and approximation of the Fourier coefficients) begin to look bad. The iconic image of Lenna, who graces three sets of pictures in the text, shows just how much better wavelets can preserve features that the eye cares about.