creating noisy image(random noise)

Question

Just as we can make a noisy image with imnoise :imnoise (A, 'salt & pepper', [density]). How to add random noise with a particular density?

score 0 · Answer 1 · answered Mar 25 '16 at 16:09

Thread your pixels as a List, where 100% equals all pixels. Simple fill the list 1,2,3,4,5,6,7 Wanted is the ratio amount of pixels

For x to your wanted-number substract list element at position [x]

the list[x] nr should then be filled with white or be inverted.

score 0 · Answer 2 · answered Feb 23 '12 at 09:57

0

Additive white Gaussian noise (AWGN)?

z = mu + randn(size(im)).*sigma;
im = im + z;

answered Feb 23 '12 at 09:57

Maurits

i was saying about random noise and what mu and sigma stands for.i want to add 10%,20% ... random noise to the image. – sujaya Feb 23 '12 at 10:19
Surely you can look up the AWGN definition on the Wikipedia yourself? – Maurits Feb 23 '12 at 12:02

2 Answers2