November 2018
Intermediate to advanced
492 pages
12h 19m
English
Content preview from Hands-On Image Processing with Python
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The non-maximum suppression algorithm
- The algorithm starts by inspecting the angles (directions) of the edges (output by the edge detector).
- If a pixel value is non-maximum in a line tangential to its edge angle, it is a candidate to be removed from the edge map.
- This is implemented by splitting the edge direction (360) into eight equal intervals with an angle of 22.50 degrees. The following table shows different cases and the actions to take:
- We may do this by looking in a π/8 range and setting the tangential comparison accordingly with a series of if conditions.
- The effect of edge thinning is clearly observed (from the previous image) ...
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