adding noise

How to add gaussian white noise of SNR=38(some value) to an image using matlab

[Oleg Komarov]

Have you given a look at randn?

Answer 1

[umar siyab]

u can use the imnoise() function to add noise to your image ... you can consult the matlab help for further detail..

Answer 2

[umar siyab]

i want my matrix element to be 1 and -1 and matrix should be of 256 by 256

[Image Analyst]

Then you should start your own question since your (implied) question is unrelated to aavula's question.