Plot image at center of label in PyQT

Question

QGridLayout is used to place QLabel.
Then cv2 images are displayed as follows.

frame = self.dequeList[cam.camID].popleft()
img = QtGui.QImage(frame, frame.shape[1], frame.shape[0], QtGui.QImage.Format_RGB888).rgbSwapped()
pix = QtGui.QPixmap.fromImage(img)
self.videoList[f"video_{cam.camID}"].setPixmap(pix)

Now display start from 0,0 coordinates as below.

I like to display image at the center of label.
How can I do that?

Asked By: batuman

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Source

Answer 1

To plot the image at the center of the QLabel, you can add the following line after creating the QPixmap object:

self.videoList[f"video_{cam.camID}"].setAlignment(QtCore.Qt.AlignCenter)

This sets the alignment of the label to Qt.AlignCenter, which centers the image in the label.

So the modified code would look like this:

from PyQt5 import QtGui, QtCore

frame = self.dequeList[cam.camID].popleft()
img = QtGui.QImage(frame, frame.shape[1], frame.shape[0], QtGui.QImage.Format_RGB888).rgbSwapped()
pix = QtGui.QPixmap.fromImage(img)
self.videoList[f"video_{cam.camID}"].setPixmap(pix)
self.videoList[f"video_{cam.camID}"].setAlignment(QtCore.Qt.AlignCenter)

Note : you need to import the QtCore module from PyQt5 to use the Qt.AlignCenter constant.

Answered By: debugger

Plot image at center of label in PyQT

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