Hi, all vxl guys!
The class vnl_levenberg_marquardt checks if the number of parameters is less than that of residuals before carrying out the minimization process, otherwise it'll returns false. This requirement prevents the estimation of homography between two images using the Gold Standard algorithm(H&Z book, p114), in which case the number of parameters is 2n+9 while the number of residuals is n. ( where n is the number of point correspondences ). Would someone get the idea to figure this issue out? Thanks!

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