Compute pixel SNR as a function of pixel voltage
[SNR, volts, SNRshot, SNRread] = pixelSNR(ISA,volts)
The pixel SNR depends on the signal level (in volts) or these can be
stimulus referred to lux-sec (see pixelSNRluxsec).
The formula for pixel signal-to-noise ratio is
SNR = 10 * log10(signalPower./noisePower);
where
signalPower: the square of the number of electrons (volts/convGain).^2;
noisePower: the sum of the read noise variance and shot noise
variance (readSD.^2 + shotSD.^2), both in electrons.
If no voltage levels are passed in, we choose volts to be logarithmically spaced
across the pixel voltage range.
The limitations imposed by the different noise types (shot noise and read
noise) can be returned, as well.
See also: pixelSNRluxsec, sensorSNR
Examples:
[SNR, volts] = pixelSNR(ISA); semilogx(volts,SNR);
[SNR, volts, SNRshot, SNRread] = pixelSNR(ISA);
figure; semilogx(volts,SNRshot,'g--',volts,SNRread,'r-',volts,SNR,'k-');
legend('Shot noise SNR','Read noise SNR','Total SNR');
grid on
Note: (1) The argument to this routine is a sensor array with an attached pixel.
Note: (2) If the user sets the read SD to 0, we treat the readSNR as infinite.
Copyright ImagEval Consultants, LLC, 2005