計算機視覺開源庫OpenCV繪制輪廓，并將輪廓排序~示例效果如下：

原圖：

示例代碼如下：

#!/usr/bin/env python3import cv2def sort_contours(cnts, method="left-to-right"):reverse = Falsei = 0if method == "right-to-left" or method == "bottom-to-top":reverse = Trueif method == "top-to-bottom" or method == "bottom-to-top":i = 1boundingBoxes = [cv2.boundingRect(c) for c in cnts](cnts, boundingBoxes) = zip(*sorted(zip(cnts, boundingBoxes),key=lambda b:b[1][i], reverse=reverse))return (cnts, boundingBoxes)def draw_contour(image, c, i):M = cv2.moments(c)cX = int(M["m10"] / M["m00"])cY = int(M["m01"] / M["m00"])cv2.putText(image, "#{}#".format(i + 1), (cX-35, cY+10), cv2.FONT_HERSHEY_SIMPLEX,1.0, (0, 255, 0), 2)return imageimage = cv2.imread("cntdemo.jpg") cv2.imshow("Input Image", image)gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) _, binimg = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)_, contours, _ = cv2.findContours(binimg, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)contours = sorted(contours, key=cv2.contourArea, reverse=False)[:3] cv2.drawContours(image, contours, -1, (0, 0, 255), 2)(contours, boundingBoxes) = sort_contours(contours, method="left-to-right")for (i, c) in enumerate(contours):draw_contour(image, c, i)cv2.imshow("Result Image", image)cv2.waitKey(0) cv2.destroyAllWindows()

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總結

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