The paper discusses the circle images-based image conformity with the lens-distortion correction.Due to finding matched points between images taken from the same point

it may avoid the problems of lighting changes and occlusion and aspect changes.It is easier than in the general point-matching problem.The paper has three main contributions:(1)At first we combine the radial distortion correction method with image conformity problem.(2)The paper presents the optimal objection function of projective transformation and lens-distortion parameters and derives the linear formulate of the optimal objection function.(3)The projective transformation and lens-distortion parameters are computed simultaneously with the nonlinear optimal method.