Correcting perspective of image based on QR code

[yatharthchhabra]

Hi Paul,
I'm trying to use your pod and I'd really appreciate some help. I'm making an AR app in which I detect a qr code in a frame and then straighten the entire frame image based on the qr code. Your library seems perfect for tranforming an image based on a polygon. Right now, I have the overall frame image and the screen coordinates of the QR code corners (in both UIkit and Core Image coordinates). How can I use your library to achieve this goal? When I pass in the coordinates of the QR code as source and entire view frame as the destination, I do not get the QR code crop. Thank you and keep up the great work!

[paulz]

Great, that's the perfect use case. Just pass UIKit coordinates of QR code corners and corners of destination view. You will get the transformation. Then apply that transformation to get straight QR code view. You probably want to capture resulting view image to pass to QR code detector.

[yatharthchhabra]

Thanks for your response. I actually tried to do just that but for some reason the crop I get is still not of the QR code. I have attached the view controller file to show you how I am using your framework. I've also attached the frame image with green dots on the detected QR code corners and the transformed image. I would really appreciate if you could point out my usage mistake. Thanks!
StraightViewController.pdf