0. 环境

- win10 + python3
- pycharm
- esp32-cam    http://192.168.4.1    

1. 创建工程

File -> Create Project -> 
-> Location: E:\Workspaces\PycharmProjects\esp32cam_opencv
-> Create

2. opencv hello

2.1 添加脚本

File -> New -> Python file -> opencv_hello.py
输入以下内容：

import cv2

image = cv2.imread('res00.jpg')  # 读取图片到内存，注意文件地址
cv2.imshow('Phuket Island', image)  # 在窗口中显示图片，第一个参数是窗口名称
cv2.waitKey()  # 按任意键继续

2.2 安装插件

File -> Settings -> Project: esp32cam_opencv -> Python Interpreter -> +
-> opencv-python -> Install Package
-> OK

2.3 运行测试

右键 opencv_hello.py -> Run 'opencv_hello' -> 

3. esp32 cam

3.1 修改 main.py

import cv2

url = "http://192.168.4.1:81/stream"

cap = cv2.VideoCapture(url)
while True:
    ret, frame = cap.read()
    cv2.imshow("frame", frame)
    if cv2.waitKey(1) & 0xFF == ord("q"):
        break

3.2 安装插件

File -> Settings -> Project: esp32cam_opencv -> Python Interpreter -> +
-> requests -> Install Package
-> OK

参考：

[1]【OpenCV-Python入门书】第一篇 HelloWorld，https://blog.csdn.net/lionguo0204/article/details/80717945
[2]ESP32-CAM 数据流的方法，https://blog.csdn.net/m0_49676146/article/details/120916227
[3]python使用opencv低延迟拉取rtsp流，https://blog.csdn.net/qq_23607397/article/details/127294588
[4]ESP32-CAM Video Streaming Web Server (works with Home Assistant)，https://randomnerdtutorials.com/esp32-cam-video-streaming-web-server-camera-home-assistant/