Can someone tell me how to add noise to an image...?

Question

I am using c++

If you could give me an example code or the algorithm for random noise for example, I would appreciate it.

(10 Points for the most helpful answer)

Answer 1

Noise is random pixels being off from true by a random factor.

(pseudocode)

Pixel noisyPixel(Pixel p)

p.blue = rand * p.blue;

p.green = rand * p.green;

p.red = rand * p.red;

return p;

int w = image.width, h = image.height;

for i = 0 to numberOfPixels

x = rand * w;

y = rand * h;

Pixel p = image.pixel(x, y);

p = noisyPixel(p);

image.setPixel(x,y,p);

numberOfPixels will be a function of the number of pixels in the image and the amount of noise desired.

This is a very rough and ready way to do it. Noise is a very involved subject.