How to find the arc length of an arc in an image

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I have an image of a solid arc.I mean a bitmapsource image .The arc starts in green colour and it goes through different colurs and the 360 degree end is red in colour.Just like the metre console of a vehicle.The background colour is white and i want to know the arc length or the angle subtended by the arc at centre.Any clarrification is entertainde.Thanks in advance

Posted 2-Oct-13 7:37am

prapaug

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W∴ Balboos, *GHB* · Answer 1 · 2013-10-02T09:39:00

You need to understand that your image has no true circle - this is your human interpretation/perception. Interpreting the contents of an image is no easy matter - imagine creating your own OCR package.

Now - if you have the means (and it's worth the effort), you can look for the circle's edges by examining the pixels - if you can determine a characteristic that truly defines the circle's edge. As you might imagine, there's no easy general solution.

Your primary hope would be to locate some pattern-recognition software that would recognize the edges in your image.