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Chapter 9: Airbor ne V ideo Systems 255
Figure 9.35 Vertical pipe.
I also processed the original unprocessed image in Figure 9.33 through the RoboRealm
Canny edge detector just to compare the results to the Wikipedia image in Figure 9.34.
Figure 9.36 shows the result, which is very similar to Figure 9.34.
I will now show you the Elev-8 Canny-edge-detector image now that you know a little
bit about this technique. Figure 9.37 is the processed Elev-8 image.
When I compared Figure 9.31, which is the outline technique, to Figure 9.37, it was
apparent that the Canny approach produced more distinct edges than the outline approach
did. The outline image seems to contain a substantial number of non-edge pixels, which I
presume is a result of the simplistic, edge-detection algorithm that I discussed previously.
Figure 9.36 RoboRealm Canny edge detection on the steam-engine valves.
