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5.6 Region-of-Interest Processing

Region-of-interest processing functions.

Image subregions may be conveniently specified by using Mathematica Graphics primitives, such as Circle, Disk, Point, Line, Rectangle, Polygon, or simply as a list of vertex positions. We follow with a few demonstrations.
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Point operations are mapped to every point in a ROI by using the function RegionPoints, which returns a list of all coordinate pairs within a region, given a region specification. Here is an example of using RegionPoints to extract all diagonal elements of a matrix.
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Region selection functions.

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This shows the result of applying a Sobel edge detector to the region defined by roi.
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LineProfile functions.

The function LineProfile is useful in obtaining details of amplitude variations (i.e., intensity profile) in an image by returning pixel values along some arbitrary user-selected path. Examples of row or column profiles were shown in Sections 2.2 and 2.5.
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