Getting the coordinates of vertices of an A4 sheet with coins on it, for its further projective transformation and coin detection

I need to transform my tilted image in a way I can find coins on an A4 paper. So far, I have been getting four coordinates of edges of my paper by manually selecting them with ginput.

targetImageData = imread('coin1.jpg');
imshow(targetImageData);
fprintf('Corner selection must be clockwise or anti-clockwise.\n');
[X,Y] = ginput(4);

Is there a way to automate this process, say, apply some edge detector and then find coordinates of each vertex and then pass them as the coordinates needed for transformation?

Answer 1

[Matt J]

The Computer Vision Toolbox has a few corner point detector apps,

https://www.mathworks.com/help/vision/ug/point-feature-types.html