外贸公司的网站,google搜索引擎入口google,河南制作网站,施工企业安全生产评价表下载使用Opencv-python库读取图像、本地视频和摄像头实时数据
Python中使用OpenCV读取图像、本地视频和摄像头数据很简单#xff0c; 首先需要安装Python#xff0c;然后安装Opencv-python库
pip install opencv-python然后在PyCharm或者VScode等IDE中输入对应的Python代码
一…使用Opencv-python库读取图像、本地视频和摄像头实时数据
Python中使用OpenCV读取图像、本地视频和摄像头数据很简单 首先需要安装Python然后安装Opencv-python库
pip install opencv-python然后在PyCharm或者VScode等IDE中输入对应的Python代码
一、使用opencv-python读取图像 比如说我们要显示上面这幅数字图像处理中的lena.jpg这幅图像读取的python代码如下所示
import cv2# Load an image using imread
img cv2.imread(images/lena.jpg)
# img cv2.imread(Resources/test.png)
# Display image
cv2.imshow(Lena image, img)
cv2.waitKey(0)
cv2.destroyAllWindows()在Python中运行结果如下
使用opencv-python读取本地视频
Opencv-python在线文档中有关于的Python示例代码https://docs.opencv.org/4.9.0/dd/d43/tutorial_py_video_display.html
import numpy as np
import cv2 as cv
cap cv.VideoCapture(vtest.avi)
while cap.isOpened():ret, frame cap.read()# if frame is read correctly ret is Trueif not ret:print(Cant receive frame (stream end?). Exiting ...)breakgray cv.cvtColor(frame, cv.COLOR_BGR2GRAY)cv.imshow(frame, gray)if cv.waitKey(1) ord(q):break
cap.release()
cv.destroyAllWindows()视频资源可以到https://github.com/murtazahassan/Learn-OpenCV-in-3-hours/blob/master/Resources/test_video.mp4下载 相关的显示本地视频的Python代码如下
import cv2frameWidth 640
frameHeight 480
cap cv2.VideoCapture(Resources/test_video.mp4)
while True:success, img cap.read()img cv2.resize(img, (frameWidth, frameHeight))cv2.imshow(Result, img)if cv2.waitKey(1) 0xFF ord(q):break
cap.release()
cv2.destroyAllWindows()相应的运行结果如下图所示
三、使用opencv-python读取摄像头数据并实时显示
使用opencv-python读取摄像头数据是非简单opencv-python文档tutorial_py_video_display里面有对应的示例代码如下
import numpy as np
import cv2 as cv
cap cv.VideoCapture(0)
if not cap.isOpened():print(Cannot open camera)exit()
while True:# Capture frame-by-frameret, frame cap.read()# if frame is read correctly ret is Trueif not ret:print(Cant receive frame (stream end?). Exiting ...)break# Our operations on the frame come heregray cv.cvtColor(frame, cv.COLOR_BGR2GRAY)# Display the resulting framecv.imshow(frame, gray)# 等待1毫秒如果用户按下q键则退出循环if cv.waitKey(1) ord(q):break
# When everything done, release the capture
cap.release()
cv.destroyAllWindows()我本地读取摄像头数据并显示的python代码如下
import cv2frameWidth 640
frameHeight 480
cap cv2.VideoCapture(0)
# cap.set(3, frameWidth)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, frameWidth)
# cap.set(4, frameHeight)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, frameHeight)
# cap.set(10, 50)
cap.set(cv2.CAP_PROP_BRIGHTNESS, 50)while True:success, img cap.read()cv2.imshow(Result, img)if cv2.waitKey(1) 0xFF ord(q):breakcap.release()
cv2.destroyAllWindows()运行结果如下图所示
参考资料
LEARN OPENCV in 3 HOURS with Python | Including 3xProjects | Computer VisionLearn-OpenCV-in-3-hoursOpenCV tutorialtutorial_py_video_displayLEARN OPENCV C in 4 HOURS | Including 3x Projects | Computer Visionmurtazahassan/Learn-OpenCV-cpp-in-4-HoursOpenCV官网OpenCV-Get StartedOpenCV Github仓库源代码
