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Reference.org
Minimum spanning tree-based segmentation
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<p><a href="/facts/Segmentation_(image_processing)/jofAhbxa">Image segmentation</a> strives to partition a digital image into regions of pixels with similar properties, e.g. homogeneity. The higher-level region representation simplifies image analysis tasks such as counting objects or detecting changes, because region attributes (e.g. average intensity or shape) can be compared more readily than raw pixels. </p>