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Chapter 3: Triangulation and Shift-based Metrology
Triangulation is probably one of the oldest and certainly one of the most common methods of making measurements using light. The simple method of using a shadow to measure the height of a building or tree can be traced back thousands of years. In practice, triangulation methods use multiple angles of light and viewing to create a shift in a scene or image that is indicative of distances from the observer. First we will consider what are considered to be passive methods of light shifts. Methods that use triangulation and/or a passive positional shift of the light or viewpoint to make measurements include stereo imaging, photogrammetry (including integral imaging), and optical flow.
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