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The Role(s) of Computers

Digital Images

In order for images to be used for measuring shape, they are first stored as a digitized representation. Usually this is an array of pixels, each with the brightness or color of the corresponding point in the original scene. Other, more concise sets of data may also be used, such as the coordinates of a limited number of points to define objects or structures. In a few cases these points, in either two or three dimensions, are input by a human. Mouse-clicking points on the image displayed on the computer screen is the most common method; placing either the object or an image on a tablet and touching landmarks with a stylus, or using a coordinate measuring machine (CMM) to touch points on a three-dimensional ...

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