Pixel density - can the playing field be leveled???

Started Jun 6, 2009 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
correction

ejmartin wrote:

Typically when the coefficients are large there is some noise
present, and so shrinking the coefficient down (not necessarily to
zero) gets rid of noise and leaves some of the detail.

This is backwards. When the coefficients are large, it means that some feature of the image is present (eg an edge standing out above the noise gives a wavelet coefficient that is larger than one would have with just the noise present). Shrinking the small coefficients relative to the large ones denoises the image.

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