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Reference.org
Range imaging
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<p>Range imaging is the name for a collection of techniques that are used to produce a 2D image showing the <a href="/facts/Depth_map/7SoCpoBX">distance to points in a scene</a> from a specific point, normally associated with some type of sensor device. </p><p>The resulting range image has pixel values that correspond to the distance. If the sensor that is used to produce the range image is properly calibrated the pixel values can be given directly in physical units, such as meters. </p>