- 寻找工件轮廓,并计算其面积
- 寻找工件的最小外接矩形,并计算其面积
- 计算轮廓面积和矩形面积之差。
工件如下图所示:
import imutils import cv2 import numpy as np image = cv2.imread("111.bmp") gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) # blurred = cv2.GaussianBlur(gray, (5, 5), 0) thresh = cv2.threshold(gray, 60, 255, cv2.THRESH_BINARY)[1] cnts = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) cnts = imutils.grab_contours(cnts) # 遍历轮廓集 for c in cnts: M = cv2.moments(c) area = cv2.contourArea(c) if area <1000000: continue # 在图像上绘制轮廓 cv2.drawContours(image, [c], -1, (0, 255, 0), 2) print("area:",area) # 寻找轮廓的最小外接矩形 # x, y, w, h = cv2.boundingRect(c) # cv2.rectangle(image,(x, y), (x + w, y + h), (0, 0, 255), 2) # 获取最小外接矩阵,中心点坐标,宽高,旋转角度 rect = cv2.minAreaRect(c) # 获取矩形四个顶点,浮点型 box = cv2.boxPoints(rect) box = np.int0(box) print(box) left_point_x = np.min(box[:, 0]) right_point_x = np.max(box[:, 0]) top_point_y = np.max(box[:, 1]) bottom_point_y = np.min(box[:, 1]) left_point_y = sorted(box[:, 1][np.where(box[:, 0] == left_point_x)])[-1] right_point_y = sorted(box[:, 1][np.where(box[:, 0] == right_point_x)])[0] top_point_x = sorted(box[:, 0][np.where(box[:, 1] == top_point_y)])[-1] bottom_point_x = sorted(box[:, 0][np.where(box[:, 1] == bottom_point_y)])[0] vertices = [[left_point_x, left_point_y],[bottom_point_x, bottom_point_y], [right_point_x, right_point_y], [top_point_x, top_point_y]] print(vertices) cv2.circle(image, (left_point_x, left_point_y), 20, (255, 255, 255), -1) cv2.circle(image, (bottom_point_x, bottom_point_y), 20, (255, 0, 0), -1) cv2.circle(image, (top_point_x, top_point_y), 20, (0, 255, 0), -1) cv2.circle(image, (right_point_x, right_point_y), 20, (0, 0, 255), -1) # 计算矩形的最长边和最短边 long_size = np.sqrt(np.math.pow((left_point_x-bottom_point_x),2) + np.math.pow((left_point_y-bottom_point_y),2)) short_size = np.sqrt(np.math.pow((left_point_x-top_point_x),2) + np.math.pow((left_point_y-top_point_y),2)) print("矩形的面积:",long_size*short_size) print("轮廓的面积:",area) poor_area = (long_size * short_size - area)/area print("缺陷面积占轮廓面积的比例:",poor_area*100,"%")
欢迎分享,转载请注明来源:内存溢出
评论列表(0条)