Robinson compass mask
| Feature detection | 
|---|
| Edge detection | 
| Corner detection | 
| Blob detection | 
| Ridge detection | 
| Hough transform | 
| Structure tensor | 
| Affine invariant feature detection | 
| Feature description | 
| Scale space | 
In image processing, a Robinson compass mask is a type of compass mask used for edge detection. It has eight major compass orientations, each will extract the edges in respect to its direction. A combined use of compass masks of different directions could detect the edges from different angles.