How to use Maximum angle threshold?

2013 3 31
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Hello, i wanna ask about MaximumAngleThreshold in http://www.mathworks.com/help/vision/ref/vision.cornerdetectorclass.html
How can I detect the corner with other angle in degree except those mentioned? e.g. 180 degree,270 degree. Thanks in advance

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Image Analyst
Image Analyst 2013-3-31

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Now 180 is not really a corner, is it? It's totally straight. And 270 is the same as 90, right?

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tedy
tedy 2013-4-1
how if i wanna detect both of 270 and 90? is still the same? how to implement each of them?
Anand
Anand 2013-4-1
90 and 270 are the same...just set the angle to 90 and you'll be fine.
tedy
tedy 2013-4-1
no,i mean how to detect 90 in order to get number 1 (as its sign) and 270 to get number 3. so,if i set the maximum angle as 90 both of them, it can't be differentiate which is 90 for number 1 and which is 90 for number 3?
Image Analyst
Image Analyst 2013-4-1
I haven't used the tool. I don't know if it can distinguish between "inside" corners like
0 0 1 1
0 0 1 1
1 1 1 1
1 1 1 1
which is perhaps what you consider a 270 degree angle, and "outside" corners like
1 1 0 0
1 1 0 0
0 0 0 0
0 0 0 0
which perhaps you consider a 90 degree angle. You'll have to call the Mathworks and ask them or figure it out yourself.
tedy
tedy 2013-4-1
how can i call the mathworks? email or what?

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tedy
tedy
2013-3-31

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