Edge Detection
What is Edge Detection?
Edge detection is used to identify where the edges are on the objects. Edge detection can be used to help people find certain objects by highlighting the object to attract their attention. Edge detection can also be used to tell people what they have highlighted over a scene.
Sobel Edge Detection?
The Sobel edge detection looks for any changes in data for the depth and normal. This is done twice for both the depth and the normal, once for horizontal detection and once for the vertical.
The Sobel method you take a pixel and check the pixels next to it. For the vertical check you would only check the pixels on the left and right side, while the horizontal check you would only check the pixels on the top and bottom. If there is no change in the data it would output a 0, but if there is change in the pixels around it would output a 1 for the corner and a 2 for the adjacent.
After checking all the pixels to find any change in the normal and depth, you would need to combine sobel horizontal and vertical for the normal and depth to get an edge detection.
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