videocapture and pyqt

Question

i use this lib http://videocapture.sourceforge.net/ for a capturing web cam. But i don't understand how it video-stream send to qpixmap.

Answer 1

If you check out the documentation for this library, you will see its very short and sweet. http://videocapture.sourceforge.net/html/VideoCapture.html

There are two ways I can tell you that you could get your image into Qt...

The best way - Directly into a QImage

getImage() states that it will return a PIL image. PIL, if you are using the latest version, has a module called ImageQt which can take a PIL Image object and give you back a QImage. From here you could convert that to QPixmap:

from PyQt4 import QtCore, QtGui
from VideoCapture import Device
from PIL import Image, ImageQt

app = QtGui.QApplication([])

cam = Device()
# this is a PIL image
pilImage = cam.getImage()
# this is a QImage
qImage = ImageQt.ImageQt(pilImage)
# this is a QPixmap
qPixmap = QtGui.QPixmap.fromImage(q)

The other way - Write to disk first

If you follow the example they give on this modules website, they show you how to use saveSnapshot() to save the image to disk. This is less desirable than the first method since you have to do disk i/o, but I will still mention it. You would then read it into your Qt app as a QPixmap:

cam = Device()
cam.saveSnapshot('image.jpg')

qPixmap = QtGui.QPixmap('image.jpg')

Do the first method. Its faster and more efficient.