1. A method for compensating for dark current in an image sensor array, wherein the image sensor array comprises more than two light sensitive pixels, comprising: determining a nominal average dark current for the image sensor array; determining location of each pixel in the image sensor array; obtaining a nominal dark current associated with each pixel based on the nominal average dark current and on the location of the pixel, wherein at least two of the pixels have differing associated nominal dark currents; and subtracting the associated nominal dark current from the image signal for each pixel.