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查找轮廓r = cv2.drawContours(o, contours, contoursIdx, color[, thickness])
参数 : o : 原始图像 contours : 需要绘制的边缘数组 contoursIdx : 需要绘制的边缘索引,如果全部绘制则为 -1. color : 绘制的颜色,为BGR格式的Scalar thickness : 可选,绘制的密度,即绘制轮廓时所用的画笔粗细import cv2import matplotlib.pyplot as pltimport numpy as npimg = cv2.imread('Penguins.jpg',2)ori = img.copy()#imgray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)rows,cols = img.shapeconvas = np.zeros((rows,cols))convas[:] = 255ret,res = cv2.threshold(img,127,255, cv2.THRESH_BINARY)contours,hierarchy = cv2.findContours(res,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)counterimg = cv2.drawContours(convas,contours,-1,(0,0,0),2)plt.subplot(121)plt.imshow(ori,'gray'),plt.title('original'),plt.xticks([]),plt.yticks([])plt.subplot(122)plt.imshow(counterimg,'gray'),plt.title('contour',),plt.xticks([]),plt.yticks([])plt.show()
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