This web content discusses using transformed ellipses to estimate perspective transformations of text. The author explains a simpler method to solve the perspective recovery problem compared to other existing sophisticated approaches, focusing on equalizing the areas of letters by transforming them through a homography. By using ellipses as proxy shapes, the author demonstrates how to optimize the perspective transformation to correct distortion in the text. The process involves composing different transformations like rotation and skew to achieve the final corrected image. The author provides detailed explanations and includes interactive visuals to aid in understanding the concepts presented.
https://mzucker.github.io/2016/10/11/unprojecting-text-with-ellipses.html