Example is as follows: :r=radon(im,30);%im is the image matrix solution is as follows: Radon transform is a parallel beam to the image of the line integral, according to the various angles obtained by a series of projection values inverse radon reconstruction to get the original image. The transform angle is counterclockwise by default, r=radon(im,30); the resulting one-dimensional array. When the angle between the parallel beam and the X axis is 30 degrees,