CS231A Course Notes 1: Camera Models
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چکیده
Let’s design a simple camera system – a system that can record an image of an object or scene in the 3D world. This camera system can be designed by placing a barrier with a small aperture between the 3D object and a photographic film or sensor. As Figure 1 shows, each point on the 3D object emits multiple rays of light outwards. Without a barrier in place, every point on the film will be influenced by light rays emitted from every point on the 3D object. Due to the barrier, only one (or a few) of these rays of light passes through the aperture and hits the film. Therefore, we can establish a oneto-one mapping between points on the 3D object and the film. The result is that the film gets exposed by an “image” of the 3D object by means of this mapping. This simple model is known as the pinhole camera model.
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