1. A system, comprising: a receiver component that receives a sequence of infrared images of a scene that includes a mobile object, the sequence of infrared images captured by an infrared camera over time, each infrared image in the sequence of infrared images comprising a plurality of pixels having a plurality of respective intensity values; a depth calculator component that computes, for each image in the sequence of images, a respective depth image, the depth image comprising a plurality of pixels having a respective plurality of values that are indicative of depths of points of the object respectively represented by the plurality of pixels relative to an emitter that emits infrared light to irradiate the scene, the plurality of values computed based at least in part upon square roots of respective intensity values of the plurality of pixels in the infrared image; and a renderer component that renders graphical data on a display screen of a computing device based at least in part upon the depth image computed by the depth calculator component.