The Center of Perspective
When we use photography to make a permanent record of something we have seen, we are endeavoring to represent a three-dimensional aggregate of objects upon a plane surface. Thus, a photograph is a point projection of a three-dimensional scene, commonly referred to as a âperspectiveâ view, with the âcenter of perspectiveâ at the camera lens itself.
Optically, our eye is nothing but a camera, and when we look at a scene with one eye open we actually see the same kind of perspective as is recorded by a camera. We could, if we wished, plot out a picture of an assemblage of objects upon a sheet of glass erected between our eye and the objects, as indicated in Fig. 1.1. In this diagram, the eye is supposed to be at P, and the appearance of the house as seen by this observer is shown traced on the sheet of glass.
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