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本帖最后由 宋恺 于 2020-9-3 11:22 编辑
此程序需要安装opencv
可以直接在cmd中输入:
- pip install opencv-python
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但因为服务器在国外,所以会很慢,建议在cmd中输入:
- python -m pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple
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一劳永逸的办法:
https://fishc.com.cn/thread-143635-1-1.html
代码如下:
- import numpy as np
- import cv2
-
- cap = cv2.VideoCapture(0)
- ret = cap.set(3, 640) # 设置帧宽
- ret = cap.set(4, 480) # 设置帧高
- font = cv2.FONT_HERSHEY_SIMPLEX # 设置字体样式
- kernel = np.ones((5, 5), np.uint8) # 卷积核
-
- if cap.isOpened() is True: # 检查摄像头是否正常启动
- while(True):
- ret, frame = cap.read()
- gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) # 转换为灰色通道
- hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) # 转换为HSV空间
-
- lower_green = np.array([35, 50, 100]) # 设定绿色的阈值下限
- upper_green = np.array([77, 255, 255]) # 设定绿色的阈值上限
- # 消除噪声
- mask = cv2.inRange(hsv, lower_green, upper_green) # 设定掩膜取值范围
- opening = cv2.morphologyEx(mask, cv2.MORPH_OPEN, kernel) # 形态学开运算
- bila = cv2.bilateralFilter(mask, 10, 200, 200) # 双边滤波消除噪声
- edges = cv2.Canny(opening, 50, 100) # 边缘识别
- # 识别圆形
- circles = cv2.HoughCircles(
- edges, cv2.HOUGH_GRADIENT, 1, 100, param1=100, param2=10, minRadius=10, maxRadius=500)
- if circles is not None: # 如果识别出圆
- for circle in circles[0]:
- # 获取圆的坐标与半径
- x = int(circle[0])
- y = int(circle[1])
- r = int(circle[2])
- cv2.circle(frame, (x, y), r, (0, 0, 255), 3) # 标记圆
- cv2.circle(frame, (x, y), 3, (255, 255, 0), -1) # 标记圆心
- text = 'x: '+str(x)+' y: '+str(y)
- cv2.putText(frame, text, (10, 30), font, 1, (0, 255, 0), 2, cv2.LINE_AA, 0) # 显示圆心位置
- else:
- # 如果识别不出,显示圆心不存在
- cv2.putText(frame, 'x: None y: None', (10, 30), font, 1, (0, 255, 0), 2, cv2.LINE_AA, 0)
- cv2.imshow('frame', frame)
- cv2.imshow('mask', mask)
- cv2.imshow('edges', edges)
- k = cv2.waitKey(5) & 0xFF
- if k == 27:
- break
- cap.release()
- cv2.destroyAllWindows()
- else:
- print('摄像头异常!')
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