Calibration-free convenient monocular lens image radial distortion rectification method
A technology of radial distortion and image correction, which is applied in the field of image processing and can solve the problems of uncalibrated template shooting, sampling, and complicated calculation process.
Active Publication Date: 2017-12-19
杭州云栖智慧视通科技有限公司
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Problems solved by technology
The biggest defect of this method is: In many practical applications, it is impossible to use a camera to shoot and sample the calibration template, and it is impossible to correct it.
The disadvantage of this type of method is that multiple calibration images taken by multiple cameras are required, and the calculation process is cumbersome.
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[0069] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0070] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...
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A calibration-free convenient monocular lens image radial distortion rectification method is characterized by comprising the following steps: 1, marking 3 rectification mark points on a single image obtained by the monocular camera or certain frame image of a video; 2, building a radial distortion rectification calculation model according to image distortion characteristics; 3, optimizing rectification mark point data so as to eliminate errors, thus improving rectification algorithmic robustness; 4, using the optimized rectification mark points to solve values for the distortion rectification calculation model, and reversely solving radial distortion parameters; 5, rectifying the image according to the radial distortion parameters, i.e., calculating the pixel value of each point on the rectified image. The method needs no auxiliary calibration image from a user, and needs not to foreknow or input any camera parameter; only 3 points are interactively inputted, thus rectifying the image in real time.
Description
technical field [0001] The invention relates to a post-processing technology of a camera image in the field of image processing, in particular to a calibration-free and convenient monocular lens image radial distortion correction method. Background technique [0002] Because the camera lens does not conform to the ideal pinhole imaging model, the captured images generally have barrel distortion, pincushion distortion and fisheye distortion. Barrel distortion and pincushion distortion are collectively referred to as radial distortion. Barrel distortion is generally caused by wide-angle lenses. The magnification of the area far away from the optical axis of the lens is lower than that near the optical axis, and a convex scene appears in the image plane. The pincushion distortion is generally formed by the telephoto lens. The magnification of the edge of the field of view is higher than that of the center of the optical axis, and the rectangular object is shot into an image wi...
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CPCG06T5/80
Inventor 李融潘涌徐以波朱建韩国尧
Owner 杭州云栖智慧视通科技有限公司