1. A computer-implemented method for detecting motion in images, comprising: receiving, by a computing system, a first image that was captured by a camera; receiving, by the computing system, a second image that was captured by the camera; generating, by the computing system and using the first image and the second image, a mathematical transformation that indicates movement of the camera from the first image to the second image with respect to a scene that is reflected in the first image and the second image; generating, by the computing system and using the first image and the mathematical transformation, a modified version of the first image that presents the scene that was captured by the first image from a position of the camera when the second image was captured, wherein a position of the camera when the first image was captured is different from the position of the camera when the second image was captured; and determining, by the computing system, a portion of the first image or second image at which a position of an object in the scene moved, by comparing the modified version of the first image to the second image.