PyQt: Paste the clipboard image.

The last time I showed how to copy&paste the clipboard text with Excel.
Today I will show you how to deal with a copied clipboard image.

All you have to do is just like below. Not much different from the text example.

 
self.clip = QtGui.QApplication.clipboard()
qimg = self.clip.image()

You might wannat convert QImage to Numpy array, but I couldn't find the very nice solution.
I will just save the image and cv2.imread. This might be slow, but I can accept for now.

qimg.save("tmp.png")
img = cv2.imread("tmp.png")

To covert from numpy array to QImage, I referred this article.
https://stackoverflow.com/questions/18676888/how-to-configure-color-when-convert-numpy-array-to-qimage

def convert_array_to_qimg(cv_img):
    height, width, bytesPerComponent = cv_img.shape
    bytesPerLine = bytesPerComponent * width;
    #cv2.cvtColor(cv_img, cv2.CV_BGR2RGB)
    return QtGui.QImage(cv_img.data, width, height, bytesPerLine, QtGui.QImage.Format_RGB888)

The overall program looks like below.

from PyQt4 import QtGui, QtCore
import sys
import cv2
import numpy as np

def convert_array_to_qimg(cv_img):
    """
    this is based on https://stackoverflow.com/questions/18676888/how-to-configure-color-when-convert-numpy-array-to-qimage
    """
    height, width, bytesPerComponent = cv_img.shape
    bytesPerLine = bytesPerComponent * width;
    #cv2.cvtColor(cv_img, cv2.CV_BGR2RGB)
    return QtGui.QImage(cv_img.data, width, height, bytesPerLine, QtGui.QImage.Format_RGB888)



class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.image_frame = QtGui.QLabel()
        fname = r"sample08.png"
        img = cv2.imread(fname)
        #img = QtGui.QImage(fname)
        qimg = convert_array_to_qimg(img)
        self.image_frame.setPixmap(QtGui.QPixmap.fromImage(qimg))
        self.clip = QtGui.QApplication.clipboard()
        
        self.setCentralWidget(self.image_frame)
        self.move(30,30)
 
    def keyPressEvent(self, e):
        if (e.modifiers() & QtCore.Qt.ControlModifier):
            #selected = self.table.selectedRanges()
                 
            if e.key() == QtCore.Qt.Key_V:#past
                qimg = self.clip.image()
                self.displayImage(qimg)

            elif e.key() == QtCore.Qt.Key_C: #copy
                pass

    def displayImage(self, qimg):
        self.image_frame.setPixmap(QtGui.QPixmap.fromImage(qimg))


 
def main(args):
    app = QtGui.QApplication(sys.argv)
    form = MainWindow()
    form.show()
     
    sys.exit(app.exec_())
 
if __name__ == "__main__":
    main(sys.argv)