PyQt4设计UI界面并添加简单功能【python+pyqt4+opencv】

学习python的过程中，了解到PyQt，加上先前用过OpenCV，自然就有了用PyQt设计UI界面，调用OpenCV函数实现功能的想法。

步骤：

1. Qt designer 快速实现UI界面，并转换成 .py文件。

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'client.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGuitry:_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:def _fromUtf8(s):return stry:_encoding = QtGui.QApplication.UnicodeUTF8def _translate(context, text, disambig):return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:def _translate(context, text, disambig):return QtGui.QApplication.translate(context, text, disambig)class Ui_Dialog(object):def setupUi(self, Dialog):Dialog.setObjectName(_fromUtf8("Dialog"))Dialog.resize(683, 417)self.pushButton = QtGui.QPushButton(Dialog)self.pushButton.setGeometry(QtCore.QRect(150, 70, 81, 31))self.pushButton.setObjectName(_fromUtf8("pushButton"))self.gridLayoutWidget = QtGui.QWidget(Dialog)self.gridLayoutWidget.setGeometry(QtCore.QRect(100, 110, 181, 151))self.gridLayoutWidget.setObjectName(_fromUtf8("gridLayoutWidget"))self.gridLayout = QtGui.QGridLayout(self.gridLayoutWidget)self.gridLayout.setObjectName(_fromUtf8("gridLayout"))self.pushButton_3 = QtGui.QPushButton(self.gridLayoutWidget)self.pushButton_3.setObjectName(_fromUtf8("pushButton_3"))self.gridLayout.addWidget(self.pushButton_3, 1, 0, 1, 1)self.pushButton_2 = QtGui.QPushButton(self.gridLayoutWidget)self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))self.gridLayout.addWidget(self.pushButton_2, 0, 0, 1, 1)self.pushButton_4 = QtGui.QPushButton(self.gridLayoutWidget)self.pushButton_4.setObjectName(_fromUtf8("pushButton_4"))self.gridLayout.addWidget(self.pushButton_4, 2, 0, 1, 1)self.pushButton_5 = QtGui.QPushButton(Dialog)self.pushButton_5.setGeometry(QtCore.QRect(540, 310, 81, 31))self.pushButton_5.setObjectName(_fromUtf8("pushButton_5"))self.lcdNumber = QtGui.QLCDNumber(Dialog)self.lcdNumber.setGeometry(QtCore.QRect(40, 360, 64, 23))font = QtGui.QFont()font.setFamily(_fromUtf8("新宋体"))font.setPointSize(11)font.setBold(True)font.setWeight(75)self.lcdNumber.setFont(font)self.lcdNumber.setObjectName(_fromUtf8("lcdNumber"))self.retranslateUi(Dialog)QtCore.QObject.connect(self.pushButton_5, QtCore.SIGNAL(_fromUtf8("clicked()")), Dialog.close)QtCore.QMetaObject.connectSlotsByName(Dialog)def retranslateUi(self, Dialog):Dialog.setWindowTitle(_translate("Dialog", "Client", None))self.pushButton.setText(_translate("Dialog", "功能选择", None))self.pushButton_3.setText(_translate("Dialog", "Face Detection", None))self.pushButton_2.setText(_translate("Dialog", "Show Picture", None))self.pushButton_4.setText(_translate("Dialog", "Eye Detetction", None))self.pushButton_5.setText(_translate("Dialog", "退出", None))

2. OpenCV实现功能。（这里以显示图片，人脸检测和眼睛检测为例）

显示图片：

import cv2filename = './painting.jpg'

def showPicture():img = cv2.imread(filename)cv2.namedWindow('Show Pictures')cv2.imshow('Show Pictures', img)if cv2.waitKey() == 27 & 0xff == ord("q"):cv2.destroyAllWindows()if __name__ == '__main__':showPicture()

人脸检测：

import cv2def faceDetect():face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_alt.xml')camera = cv2.VideoCapture(0)while (True):ret, frame = camera.read()gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)faces = face_cascade.detectMultiScale(gray, 1.3, 5)for (x, y, w, h) in faces:cv2.rectangle(frame, (x, y), (x+w, y+h), (255, 0, 0), 2)cv2.imshow('VideoFaceDetect', frame)k = cv2.waitKey(1)if k == ord("q"):break
    camera.release()cv2.destroyAllWindows()if __name__ == '__main__':faceDetect()

人眼检测：

import cv2def eyeDetect():eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')camera = cv2.VideoCapture(0)while (True):ret, frame = camera.read()gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)eyes = eye_cascade.detectMultiScale(gray, 1.3, 5, 0, (40, 40))for (ex, ey, ew, eh) in eyes:cv2.rectangle(frame, (ex, ey), (ex+ew, ey+eh), (0, 255, 0), 2)cv2.imshow('VideoFaceDetect', frame)k = cv2.waitKey(1)if k == ord("q"):break
    camera.release()cv2.destroyAllWindows()if __name__ == '__main__':eyeDetect()

3. 二者结合

# -*- coding: utf-8 -*-

from showpicture import *
from facedetect import *
from eyedetect import *
from client import *
import sysclass MyClient(QtGui.QDialog):def __init__(self):QtGui.QDialog.__init__(self)self.ui = Ui_Dialog()self.ui.setupUi(self)_timer = QtCore.QTimer(self)_timer.timeout.connect(self._showtime)_timer.start()self._showtime()QtCore.QObject.connect(self.ui.pushButton_2, QtCore.SIGNAL("clicked()"), self._showpicture)QtCore.QObject.connect(self.ui.pushButton_3, QtCore.SIGNAL('clicked()'), self._facedetect)QtCore.QObject.connect(self.ui.pushButton_4, QtCore.SIGNAL('clicked()'), self._eyedetect)def _showtime(self):_time = QtCore.QTime.currentTime()_text = _time.toString("hh:mm")self.ui.lcdNumber.display(_text)def _showpicture(self):showPicture()def _facedetect(self):faceDetect()def _eyedetect(self):eyeDetect()if __name__ == '__main__':app = QtGui.QApplication(sys.argv)my = MyClient()my.show()sys.exit(app.exec_())

这个project小且简单，代码也不够规范，主要是将自己的思路实现

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