NameError: name 'self' is not defined

[hobbyist]

This is the code for opening .tif on a PyQT window:

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow

app = QApplication(sys.argv)

window = QMainWindow()
window.show()

def getFrame(self):
	fp = r'/home/UbuntuUser/Desktop/UAV.tif'
	self.img = cv2.imdecode(np.fromfile(fp, dtype=np.uint8), cv2.IMREAD_UNCHANGED)
	print(self.img)

self.getFrame()

# Start the event loop.
app.exec_()

Why do I get this error??

Error:
Traceback (most recent call last):
  File "mycode.py", line 14, in <module>
    self.getFrame()
NameError: name 'self' is not defined

Thank you