1. A method to fuse images based on scene motion, comprising: obtaining a first short-exposure image of a scene followed immediately by a long-exposure image of the scene followed immediately by a second short-exposure image of the scene; determining a first spatial difference map based on the first and second short-exposure images; determining a motion value indicative of an amount of motion of an object in the scene based on the first spatial difference map; designating the long-exposure image as an output image when the motion value is less than a first threshold or greater than a second threshold; determining the output image in accordance with the following when the motion value is greater than or equal to the first threshold and less than or equal to the second threshold— determining a reduced-noise short-exposure image based on the first and second short-exposure images and the first spatial difference map, and determining the output image based on a combination of the reduced-noise short-exposure image and the long-exposure image; and storing the output image in a memory.