Sensor optimal image interpolation

Previously, we derived sensor optimal prefilters for image interpolation. The prefilters were applied prior to integer interpolation with a standard (e.g., linear or cubic) kernel. Here we expand upon that notion and construct complete, sensor optimal interpolation kernels for rational interpolation factors. After restating the interpolation problem in a reconstruction-like fashion, we employ a simple model of the image capture system to derive the MMSE interpolator. Results indicate significant subjective improvements over cubic interpolation, for little extra computation.