``add Gaussian noise'' -- add Gaussian noise to a volume

purpose:

Add Gaussian noise having a specified standard deviation to an 8-bit volume.

input:

An 8-bit volume.

output:

An 8-bit volume having Gaussian noise added to it.

parameters:

Default parameters menu is

noise std.dev. = 20
* input from vol # = 0
* copy output to vol # = 0
*

The noise standard deviation is in graylevels on an 8-bit grayscale.

comments:

 

1. This is a slow function. If you wish to add noise to an entire volume, run the function in the background.
2. All results are confined to 8-bits. Thus, values above 255 or below 0 (after noise is added) are clipped to their respective limits.