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Have you tried with the actual circle grid image provided by opencv?

You can find it here for example:

http://opencv.itseez.com/trunk/_downloads/acircles_pattern.png

Have you tried with the actual circle grid image provided by opencv?

You can find it here for example:

http://opencv.itseez.com/trunk/_downloads/acircles_pattern.pnghttp://docs.opencv.org/trunk/_downloads/acircles_pattern.png