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Sobel Edge Detection

The Sobel Edge Detection command computes the gradient magnitude of the image using horizontal and vertical Sobel kernels. Each pixel in the output represents the local rate of intensity change.

When to use

Sobel is faster and simpler than Canny, making it suitable for real-time preview or as a feature extraction step feeding into a threshold. Edges are broader and less precise than Canny but the computation is significantly faster.

Parameters

ParameterDescription
Kernel sizeSize of the Sobel kernel (range 3–27)

Larger kernel sizes smooth gradients over a wider neighbourhood before computing the magnitude, reducing noise sensitivity but producing thicker edges.