Include dsnu and prnu noise into a sensor image
[noisyImage,offsetFPNImage,gainFPNImage] = noiseFPN(ISA)
This routine adds the dsnu and prnu noise. (Shot noise is added
in noiseShot).
The DSNU and PRNU act as an additive offset to the voltage image (DSNU)
and as a multiplicative gain factor (PRNU). Specifically, we first
compute the mean voltage image. Then we transform the mean using
outputVoltage = (1 + PRNU)*meanVolt + DSNU
where DSNU is a Gaussian random variable with a standard deviation
obtained by sensorGet(ISA,'dsnuSigma'). The PRNU is also a Gaussian
random variable with a standard deviation of sensorGet(ISA,'prnuSigma').
The dsnuSigma and prnuSigma are set in the sensor window interface.
This routine permits a zero integration time so that it can be used for
CDS calculations. In this case, when ISA.integrationTime = 0, no
gainFPNImage is returned because, well, there is no gain.
See also: noiseShot
Example:
[noisyImage,offsetFPNImage,gainFPNImage] = noiseFPN(vcGetObject('ISA'));
imagesc(noisyImage); colormap(gray)
Copyright ImagEval Consultants, LLC, 2003.