MedicalVisualization

Gradient Vs Sobel Operator

Smooth Shading Examples | | Contour Tracing

The central differences method does only take 6 of the surrounding 26 voxels into account.

The so called Sobel operator applies the central differences method to the entire neighborhood, resulting in a smoother change of the normal across voxel boundaries:

Left: Central Differences, Right: Sobel Operator

Angio-Iso1 Angio-Iso1-Sobel
Angio-Iso1-Aorta Angio-Iso1-Aorta-Sobel


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