curvature direction
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i want to find curvature direction in a circle image.can anyone help me with matlab code to find the direction of curvature as clockwise or counterclockwise.
2 个评论
Jan
2012-3-21
A circle does not have a direction. Please post a picture to explain, how the orientation could be detected.
Nithyakalyani.
2012-3-21
采纳的回答
Matt Kindig
2012-3-21
Is the circle actually part of an image, or do you have the coordinates of the circle? If you have the coordinates, it's just a matter of calculating the sign of the cross product.
cp = cross( [x(2)-x(1), y(2)-y(1), 0], [x(3)-x(1), y(3)-y(1), 0])
direction = sign(cp); %+1 if counterclockwise, -1 if clockwise
4 个评论
Nithyakalyani.
2012-3-21
Nithyakalyani.
2012-3-21
Matt Kindig
2012-3-21
It's not clear to me then how you define clockwise or counterclockwise in your image. Given only an image, how can you tell which direction in which?
Nithyakalyani.
2012-3-22
更多回答（1 个）
Matt Kindig
2012-3-22
0 个投票
It sounds like you mean you want to find the curvature itself (using a technique like shown here: http://en.wikipedia.org/wiki/Curvature. This has nothing to do with the clockwise/counterclockwise direction.
As myself and Jan Simon have requested, can you post an example of your fingerprint image? We can't make code recommendations without knowing what kind of image your are working with.
2 个评论
Nithyakalyani.
2012-3-23
Jan
2012-3-23
Just search in this forum. It is explained e.g. in the "Markup help" link on this page, and at http://www.mathworks.com/matlabcentral/answers/243-how-do-i-post-a-picture-with-my-question .
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2012-3-21
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