opencv-api arcLength

retval=cv.arcLength(curve, closed)
参数 描述
retval 返回值,轮廓的周长
closed 曲线是是否闭合

参考文献:
https://docs.opencv.org/master/d3/dc0/group__imgproc__shape.html#ga8d26483c636be6b35c3ec6335798a47c

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