目录
1.测试摄像头是否可用
查看是否连接到摄像头
CSI摄像头测试
USB摄像头测试
2.若以上步骤正常，进行oepncv读取摄像头数据
（1）CSI摄像头
1.安装v4l2-utils协助工具
2.查看摄像头详细参数--支持的图片大小和对应帧率
3.安装管道gstreamer库
4.使用opencv读取图片例程
（2）USB摄像头
1.测试摄像头是否可用
查看是否连接到摄像头
ls /dev/video*
CSI摄像头测试
nvgstcapture-1.0
USB摄像头测试
#首先安装camorama库sudo apt-get install camorama#然后运行camorama /dev/video0 #这里我只安装了USB摄像头
2.若以上步骤正常，进行oepncv读取摄像头数据
（1）CSI摄像头
1.安装v4l2-utils协助工具
sudo apt install v4l-utils
2.查看摄像头详细参数--支持的图片大小和对应帧率
v4l2-ctl --device=/dev/video0 --list-formats-ext
3.安装管道gstreamer库
sudo add-apt-repository universesudo add-apt-repository multiversesudo apt-get updatesudo apt-get install gstreamer1.0-tools gstreamer1.0-alsa gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libavsudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-good1.0-dev libgstreamer-plugins-bad1.0-dev
4.使用opencv读取图片例程
#coding=utf-8import cv2# 设置gstreamer管道参数def gstreamer_pipeline(capture_width=1280, #摄像头预捕获的图像宽度capture_height=720, #摄像头预捕获的图像高度display_width=1280, #窗口显示的图像宽度display_height=720, #窗口显示的图像高度framerate=60, #捕获帧率flip_method=0,#是否旋转图像):return ("nvarguscamerasrc ! ""video/x-raw(memory:NVMM), ""width=(int)%d, height=(int)%d, ""format=(string)NV12, framerate=(fraction)%d/1 ! ""nvvidconv flip-method=%d ! ""video/x-raw, width=(int)%d, height=(int)%d, format=(string)BGRx ! ""videoconvert ! ""video/x-raw, format=(string)BGR ! appsink"% (capture_width,capture_height,framerate,flip_method,display_width,display_height,))if __name__ == "__main__":#根据摄像头参数设置capture_width = 1280 #capture_height = 720framerate = 60# 帧数#展示图片大小display_width = 1280display_height = 720flip_method = 0# 方向# 创建管道#管道与视频流绑定cap = cv2.VideoCapture(gstreamer_pipeline(capture_width,capture_height,display_width,display_height,framerate,flip_method), cv2.CAP_GSTREAMER)if cap.isOpened():window_handle = cv2.namedWindow("CSI Camera", cv2.WINDOW_AUTOSIZE)# 逐帧显示while cv2.getWindowProperty("CSI Camera", 0) >= 0:ret_val, img = cap.read()cv2.imshow("CSI img", img)keyCode = cv2.waitKey(30) & 0xFFif keyCode == 27:# ESC键退出breakcap.release()cv2.destroyAllWindows()else:print("open error")
（2）USB摄像头
import cv2cap = cv2.VideoCapture('./dev/video0') #用ls /dev/video* 可读取出来while(1):ret,frame = cap.read() if ret:cv2.imshow("USB_img",frame) keyCode = cv2.waitKey(30) & 0xFFif keyCode == 27:# ESC键退出break cap.release()cv2.destroyAllWindows()
