docPhil99

The code for this tutorial is here

Opencv provides are useful, but limited, method of building a GUI. A much more complete system could be acheived using pyqt. The question is, how do we display images. There are quite a few possible routes but perhaps the easiest is to use QLabel since it has a setPixmap function. Below is some code that creates two labels. It then creates a grey pixmap and displays it one of the labels. code: staticLabel1.py

from PyQt5.QtWidgets import QWidget, QApplication, QLabel, QVBoxLayout
from PyQt5.QtGui import QPixmap, QColor
import sys

uranusjr

在 Ubuntu 16.04 為 Raspbian Jessie 交叉編譯 Qt 5.6 桌面版

筆記

Qt 在 Raspberry Pi 上可以跑兩種版本：

• 桌面版。你平常在 Linux 發行版裡看到的會是這個，包含 Raspbian 在內。通常基於 X11，就是個普通的 GUI 框架。
• 嵌入版。這個版本不需要鐘面系統，通常是直接走 framebuffer 直接把東西畫到螢幕上，適合一些嵌入式設備的應用。

這個教學會編譯桌面版，因為我對這個版本比較熟。我上次試的時候 OpenGL 在 embedded 版還有些問題，不過 Qt 在那之後有很多更新，狀況應該會好很多。Qt 官方 wiki 也有個相關的教學：

nioto

#!/usr/bin/python
'''
  A Simple mjpg stream http server for the Raspberry Pi Camera
  inspired by https://gist.github.com/n3wtron/4624820
'''
from BaseHTTPServer import BaseHTTPRequestHandler,HTTPServer
import io
import time
import picamera

n3wtron

#!/usr/bin/python
'''
	Author: Igor Maculan - [email protected]
	A Simple mjpg stream http server
'''
import cv2
import Image
import threading
from BaseHTTPServer import BaseHTTPRequestHandler,HTTPServer
from SocketServer import ThreadingMixIn