Capture QR Code image clearly

I am trying to detect a printed high quality QR code and save the cropped QR image from the frame in which the QR was present.
I am using opencv video capture and pyzbar for QR detection with different preprocessing steps like gray scale conversion, thresholding, video stabilization etc.
I need to capture 100% pixels present within the QR code and do further processing as needed in a project I am working on.
Can someone give their insights on this?
Thank you.