this file contains the implementation of the "contraharmonic filter" using the basic formula of finding contraharmonic mean achieved through the use of for loops. contraharmonic filter can remove both-SALT n PEPPER noise from the image but not simultaneously. The positive order contraharmonic filter removes the pepper noise and the negative order removes the salt noise. SALT n PEPPER noise has been added to the image and it has been removed sequentially using the contraharmonic filter of positive and negative filters one after the other. It has been observed that the removal of salt noise followed by the removal of the pepper noise gives better results...

contraharmonic
..............\for_contraps.m
..............\for_contrasp.m

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