Opencv cvcircle function

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cvCircle(CvArr* img, CvPoint center, int radius, CvScalar color, int thickness=1, int lineType=8, int shift=0)

img Is an image pointer , Single channel and multi-channel are ok , There is no need for special requirements

center To draw the center of a circle

radius Is the radius of the circle

color Set the color of the circle , For example, use CV_RGB(255, 0,0) Set to red

thickness Set the thickness of the circle line , The larger the value, the thicker the line , A negative number is the filling effect

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