approxCurve=cv.approxPolyDP(curve, epsilon, closed[, approxCurve])
参数描述
approxCurve返回值,近似的周长
curve轮廓向量
epsilon近似度
closed是否闭合

参考文献:
https://docs.opencv.org/master/d3/dc0/group__imgproc__shape.html#ga0012a5fdaea70b8a9970165d98722b4c

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