challenge 7: OpenCV capture camera video

Author: zhiwehu

007_OpenCV_Capture_Camera_Video.md

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+# OpenCV Capture Camera Video
+Use OpenCV to capture computer's camera and show the video.
+
+## Requirements
+
+1. It'll open the computer's camera and show the video in a window.
+2. When you press "q" key it'll quit.
+
+## What will we practice in this project?
+
+- OpenCV: you need to install the `opencv-python` package via `pip install opencv-python` command in this project environment.
+- while loop
+- if condition
+- keyboard check
+
+## A reference code
+
+```python
+import cv2
+
+# Open your computer's default camera device.
+# If your default camera ID is not 0, please use the correct ID
+camera = cv2.VideoCapture(0)
+
+# while loop to read the camera image
+while True:
+    success, img = camera.read()
+    # if read success, it'll show the image in a "Video" window
+    if success:
+        cv2.imshow('Video', img)
+    # get the key press, if you pressed "q" key it'll break the while loop
+    k = cv2.waitKey(1)
+    if k == ord('q'):
+        break
+
+# release your camera device and close the OpenCV windows
+camera.release()
+cv2.destroyAllWindows()
+
+```
+
+## Run the demo
+Install the OpenCV:
+```shell
+pip install -r requirements.txt
+```
+Please save the Python as opencv_capture_camera_video.py and run it in console：
+
+```
+python opencv_capture_camera_video.py
+```
+
+----
+
+# 使用OpenCV捕捉电脑摄像头视频
+
+## 项目需求
+
+- 运行程序会打开电脑摄像头，并显示捕捉到的视频
+- 按`q`键会退出程序
+
+## 项目练习
+
+- 安装OpenCV，需要使用`pip install opencv-python`将OpenCV安装到项目环境中
+- while循环
+- if条件判断
+- OpenCV窗口按键
+
+## 项目参考代码
+
+```python
+import cv2
+
+# 打开电脑摄像头
+# 默认摄像头编号为0，如果你的电脑默认摄像头编程不为0，请使用其他数字
+camera = cv2.VideoCapture(0)
+
+# 重复去读取摄像头捕捉到的视频
+while True:
+    success, img = camera.read()
+    # 如果捕捉成功，将捕捉到的视频显示在一个"Video"窗口中
+    if success:
+        cv2.imshow('Video', img)
+    # 当在Video窗口上按下k键退出程序
+    k = cv2.waitKey(1)
+    if k == ord('q'):
+        break
+
+# 释放摄像头并关闭OpenCV打开的窗口
+camera.release()
+cv2.destroyAllWindows()
+
+```
+
+## 测试运行
+
+Install OpenCV:
+```shell
+pip install -r requirements.txt
+```
+保存代码为opencv_capture_camera_video.py并运行：
+
+```
+python opencv_capture_camera_video.py
+```

code/7/opencv_capture_camera_video.py

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+import cv2
+
+# Open your computer's default camera device.
+# If your default camera ID is not 0, please use the correct ID
+camera = cv2.VideoCapture(0)
+
+# while loop to read the camera image
+while True:
+    success, img = camera.read()
+    # if read success, it'll show the image in a "Video" window
+    if success:
+        cv2.imshow('Video', img)
+    # get the key press, if you pressed "q" key it'll break the while loop
+    k = cv2.waitKey(1)
+    if k == ord('q'):
+        break
+
+# release your camera device and close the OpenCV windows
+camera.release()
+cv2.destroyAllWindows()

code/7/requirements.txt

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+# My Python version is: 3.8.9
+opencv-python==4.5.4.60