TimSC · May 29, 2013 13:01 · May 29, 2013
diff --git a/qt4-webcam.py b/qt4-webcam.py
@@ -0,0 +1,85 @@
+'''
+QT4 Webcam demo in python
+Copyright (c) 2013, Tim Sheerman-Chase
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met: 
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer. 
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those
+of the authors and should not be interpreted as representing official policies, 
+either expressed or implied, of the FreeBSD Project.
+'''
+
+import sys, time, cv
+from PyQt4 import QtGui, QtCore
+
+class CamWorker(QtCore.QThread): 
+    def __init__(self): 
+		super(CamWorker, self).__init__() 
+		self.cap = cv.CaptureFromCAM(-1)
+		capture_size = (640,480)
+		cv.SetCaptureProperty(self.cap, cv.CV_CAP_PROP_FRAME_WIDTH, capture_size[0])
+		cv.SetCaptureProperty(self.cap, cv.CV_CAP_PROP_FRAME_HEIGHT, capture_size[1])
+
+    def run(self):
+		while 1:
+			time.sleep(0.01)
+			frame = cv.QueryFrame(self.cap)
+			im = QtGui.QImage(frame.tostring(), frame.width, frame.height, QtGui.QImage.Format_RGB888).rgbSwapped()	
+			self.emit(QtCore.SIGNAL('webcam_frame(QImage)'), im)
+
+class MainWindow(QtGui.QMainWindow):
+	def __init__(self):
+		super(MainWindow, self).__init__() 
+		self.resize(700, 550)
+		self.move(300, 300)
+		self.setWindowTitle('Qt Webcam Demo')
+
+		self.scene = QtGui.QGraphicsScene(self)
+		self.view  = QtGui.QGraphicsView(self.scene)
+
+		self.vbox = QtGui.QVBoxLayout()
+		self.vbox.addWidget(self.view)
+
+		centralWidget = QtGui.QWidget()
+		centralWidget.setLayout(self.vbox)
+		self.setCentralWidget(centralWidget)
+		self.show()
+
+
+	def ProcessFrame(self, im):
+		print "Frame update", im
+		pix = QtGui.QPixmap(im)
+		self.scene.clear()
+		self.scene.addPixmap(pix)
+
+
+if __name__ == '__main__':
+
+	app = QtGui.QApplication(sys.argv)
+
+	mainWindow = MainWindow()
+
+	camWorker = CamWorker()
+	QtCore.QObject.connect(camWorker, QtCore.SIGNAL("webcam_frame(QImage)"), mainWindow.ProcessFrame)
+	camWorker.start() 
+
+	sys.exit(app.exec_())