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Reference.org
Structure tensor
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<p> In mathematics, the structure <a href="/facts/Tensor/pNjFo5tV">tensor</a>, also referred to as the second-moment matrix, is a <a href="/facts/Matrix_(mathematics)/qa8FI4ko">matrix</a> derived from the <a href="/facts/Gradient/TsR7uukj">gradient</a> of a <a href="/facts/Function_(mathematics)/CdReEKCh">function</a>. It describes the distribution of the gradient in a specified neighborhood around a point and makes the information invariant to the observing coordinates. The structure tensor is often used in <a href="/facts/Image_processing/zenalNCf">image processing</a> and <a href="/facts/Computer_vision/Tl2Yyk66">computer vision</a>. </p>