1. A method for determining a geometry of a scene, comprising: projecting an output image into a scene, in which a time to project the output image is t 1 ; acquiring, while projecting the output image, an input image of the scene, in which a time to acquire the input image is t 2 , and in which t 1 >t 2 , and in which the input image includes a distinguishable stripe of pixels with an edge due to t 1 >t 2 ; and measuring an amount of distortion of the edge from a straight line to determine a geometry of the scene.