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To create the homography matrix, we solve for the matrix H = [[a, b, c] [d, e, f] [g, h, 1]] where H * [x, y, 1] = [x', y', 1]. We can account for more than four points (to create a smoother transformation) by using least squares.
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Using the homography and warping, I rectified the image of a book.
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In progress!