public interface ExposureFinder
This interface should be implemented by objects that can calculate the exposure corresponding to a given pixel in an image.
Specify the input image for which we are going to get the exposure.
double getExposure(int pixel)Get the exposure for a given pixel. For 3-d images the exposure is assumed to be constant in the energy dimension. This is probably not true, but we don't anticipate adding 3-d images much.