Gateway routine for plotting various types of image noise
imageNoise([noiseType],[ISA],[figNum])
The default noise type is shot-noise (electron variance). Other types
are dsnu and prnu. The shot-noise is generated on-the-fly. The dsnuImage and
prnuImage are taken from the sensor array.
Example:
imageNoise('shotNoise',vcGetObject('sensor'));
Copyright ImagEval Consultants, LLC, 2003.