Structure tensor
| Feature detection | 
|---|
| Edge detection | 
| Corner detection | 
| Blob detection | 
| Ridge detection | 
| Hough transform | 
| Structure tensor | 
| Affine invariant feature detection | 
| Feature description | 
| Scale space | 
In mathematics, the structure tensor, also referred to as the second-moment matrix, is a matrix derived from the gradient of a function. 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 image processing and computer vision.