Sobel operator
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The Sobel operator is used in image processing, particularly within edge detection algorithms. Technically, it is a discrete differentiation operator, computing an approximation of the gradient of the image intensity function. At each point in the image, the result of the Sobel operator is either the corresponding gradient vector or the norm of this vector. The Sobel operator is based on convolving the image with a small, separable, and integer valued filter in horizontal and vertical direction and is therefore relatively inexpensive in terms of computations. On the other hand, the gradient approximation that it produces is relatively crude, in particular for high frequency variations in the image.
- Related: Digital image processing, Computer vision, Edge detection, Feature extraction, Image gradient, Roberts Cross, Prewitt operator, Laplace operator
| Sobel edge detection in Opencv Sobel edge detection in Opencv www.mygeeksite.in/.../sobel-edge-detection-opencv-for-windows.html - Web |
| Bibliographic citations for Irwin Sobel Bibliographic citations for Irwin Sobel www.informatik.uni-trier.de/.../Sobel:Irwin.html - Web |
| Sobel and Scharr 5x5 gradients Sobel and Scharr 5x5 gradients hlevkin.com/articles/SobelScharrGradients5x5.pdf - Web |
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