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VERY IMPRESSIVE PART AT 4:10
We current a novel photographic method referred to as twin images, which exploits Helmholtz reciprocity to interchange the lights and cameras in a scene. With a video projector offering structured illumination, reciprocity permits us to generate photos from the point of view of the projector, although no digital camera was current at that location. The method is totally image-based, requiring no information of scene geometry or floor properties, and by its nature mechanically consists of all transport paths, together with shadows, interreflections and caustics. In its easiest kind, the method can be utilized to take images with no digital camera; we exhibit this by capturing {a photograph} utilizing a projector and a photo-resistor. If the photo-resistor is changed by a digital camera, we will produce a 4D dataset that enables for relighting with 2D incident illumination. Utilizing an array of cameras we will produce a 6D slice of the 8D reflectance subject that enables for relighting with arbitrary gentle fields. Since an array of cameras can function in parallel with out interference, whereas an array of sunshine sources can not, twin images is basically a extra environment friendly solution to seize such a 6D dataset than a system based mostly on a number of projectors and one digital camera. For example, we present how twin images can be utilized to seize and relight scenes.
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