Image distortion correction method and real-time correction device based on conic section

Abstract

The invention relates to an image distortion correction method based on a conic curve and a real-time correction device, and belongs to the technical field of image processing. In particular, the invention relates to an image distortion correction method based on a conic curve and a device for real-time correction of an image using the method, which uses an ellipse or hyperbolic equation for simulating image distortion and is achieved in an embedded system. First of all, a lens is calibrated, and then in accordance with the calibration result, a distorted image is corrected in real-time. The method comprises a first step of obtaining a photograph with a grid pattern picture; a second step establishing a plane rectangular coordinate system; a third step of judging the image distortion type according to the photograph; a fourth step of obtaining an approximate conic curve equation of a deformation line; and a fifth step of obtaining a corresponding relation between the distorted image and the corrected image pixel point. The corresponding relation is written into a CPU of the embedded system. In operation, the CPU reads the pixel information of the distorted image, and according to the corresponding relation, converts the position and writes into the corrected image file. The invention can be used for reducing the configuration requirement of the CPU while maximizing the correction of the image to obtain an acceptable corrected image.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a conic section-based image distortion correction method and a device for real-time image correction using the method. Background technique [0002] At present, in the field of surveillance, in order to meet the needs of different situations, different types of lenses need to be used. The general lens has a certain degree of optical distortion in the imaging process, which causes some changes in the size and shape of the imaging image, and the quality of the image decreases, which will bring errors to the subsequent image analysis and image measurement, and even cause misjudgment. Therefore, it is necessary to correct the geometric distortion of the image caused by the camera lens. [0003] Depending on the lens, the possible distortions fall into two categories: barrel distortion and pincushion distortion. [0004] The correction algorithms for nonlinear d...

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent application "A Calibration Method and Calibration Device for Radial Distortion of Fisheye Lens" (Application No.: 201410244246.3) discloses a method for fitting the distortion using a group of collinear arcs with centers of circles. CPU performance requirements are high; the Chinese patent application "A Method and Device for Correcting Image Barrel Distortion" (Application No.: 201510019338.6) discloses a method that determines the curvature and compression rate at the coordinates according to the lens parameters and pixel coordinates, Then the coordinate point after the pixel coordinate correction is obtained

This method depends on the lens parameters and can only correct the barrel distortion of the image

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