Applies the Canny edge detection algorithm to an image. The output is an image whose bands have the same names as the input bands, and in which non-zero values indicate edges, and the magnitude of the value is the gradient magnitude.
| Usage | Returns | ee.Algorithms.CannyEdgeDetector(image, threshold, sigma) | Image |
| Argument | Type | Details | image | Image | The image on which to apply edge detection. |
threshold | Float | Threshold value. The pixel is only considered for edge detection if the gradient magnitude is higher than this threshold. |
sigma | Float, default: 1 | Sigma value for a gaussian filter applied before edge detection. 0 means apply no filtering. |