frthre Thresold the pixel's gray-levels of a noisy fimage for optimal recovery
frthre [-l noise] fimage result
-l noise : Absolute value of the additive noise
fimage : Input fimage
result : Output image
void frthre (A , B , noise )
Fimage A , B ;
float *noise ;
frthre copies the input image A in the output B and makes a thresold of the pixel's values according the rule:
noiseis the absolute maximal value of the noise (noise level).
In [DJ94], it is proved that this simple thresold rule is one of the best estimator for recovering a noisy image (additive noise) using the MiniMax error, when the coefficients in A and B are coordinates in an orthonormal basis (such as wavelet basis).
Last Modification date : Thu Nov 29 20:23:56 2001