OpenCV：按区域排序轮廓（Python） [英] OpenCV: Ordering a contours by area (Python)

问题描述

OpenCV库提供了一个函数，该函数返回二进制（阈值）图像的轮廓。

The OpenCV library provides a function that returns a set of contours for a binary (thresholded) image. The contourArea() can be applied to find associated areas.

默认情况下，findContours（）输出的轮廓列表是否按面积排序？如果不是，有人知道cv2函数按区域排序轮廓列表吗？

Is the list of contours out outputted by findContours() ordered in terms of area by default? If not, does anyone know of a cv2 function that orders a list of contours by area?

请使用Python而不是C语言提供响应。

Please provide responses in Python, not C.

推荐答案

使用排序的并按区域键排序：

cnts = cv2.findContours(boolImage.astype(np.uint8), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
cnts = cnts[0] if imutils.is_cv2() else cnts[1]  
cntsSorted = sorted(cnts, key=lambda x: cv2.contourArea(x))

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