How can you straighten the perspective of images?

Question

ImageMagick

Hello, there are such images:



The main task is to align the perspective, imagemagick seems to be able to handle this, but for this, as I understand it, you need to get the coordinators of all 4 labels. With this difficulty, I have no idea how this can be done. Tell me where to go next, how you can get marks and align the perspective.

Answer 1

Gaussian blur - binarize - find boundaries - Hough transform - eggsbasket - find 4 maxima (these will be angles) - convert coordinates back - congratulations, you are great.
Hough transformation - two straight lines turned into two bright points