Large-viewing-angle image distortion correction and processing method

A technology of image distortion and correction processing, which is applied in the field of image processing, can solve the problems of poor versatility of correction processing methods, large computing time, and large viewing angle image distortion, etc., and achieve the effects of reducing computing time, easy implementation, and good versatility

Inactive Publication Date: 2013-12-04
玉振明 +3
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Problems solved by technology

[0012] The purpose of the present invention is to provide a correction processing method for large viewing angle image distortion in view of the technical problems of poor versatility of the correction processing method and large calculation time in the prior art

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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] The idea of ​​the present invention is to obtain the parameters of the model without using control points, so that the calculation process is relatively simple, and according to the analysis of the distortion generation in the background technology, the generation of distortion is simulated by changing the focal length; at the same time, it is well known that the ideal imaging The system has rotational symmetry, so we choose to use the hemispherical distortion correction model as the correction model in this article, and this article assumes that the center point of the image is the center point of the distortion. The principle is as follows:

[0052] refer to image 3 As shown, the space coordinate system is set as X-Y-Z, the hemisphere is a spherical model, and the radius of the sphere is R=OF. The projection surface s in th...

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Abstract

The invention discloses a large-viewing-angle image distortion correction and processing method. The large-viewing-angle image distortion correction and processing method comprises the steps of S1, calculating a distance between any point in a corrected image and the center of the image, namely ideal image height; S2 adopting an improved distortion rate formula to calculate the distortion rate D corresponding to the point; S3, calculating distortion point coordinates according to the distortion rate D; S4 adopting a bilinear interpolation method and ideal coordinates corresponding to the obtained distortion point coordinates to perform interpolation so as to obtain a corrected image. A distortion correction approximation model of the method can conveniently obtain the distortion rate of each point, accordingly the corresponding distortion point coordinates can be calculated according to the coordinates of ideal points, and a 'void' phenomenon produced on the corrected image is avoided. The large-viewing-angle image distortion correction and processing method does not need a specially manufactured template to calibrate lens distortion parameters, accordingly a large number of iterative operation during parameter calculation is omitted, and the method is simple and easily achieved in hardware. In addition, when the image size is large, the calculation time can be effectively shortened, and the universality is good.

Description

technical field [0001] The present invention relates to the technical field of image processing, and more specifically, to a method for correcting and processing large viewing angle image distortion. Background technique [0002] In recent years, with the rapid development of computer technology, the application of image processing has become more and more extensive and in-depth, so the demand for images with a larger field of view is becoming more and more urgent. For example, various aspects such as medical electronic endoscopes, special monitoring systems for banks, transportation or supermarkets, vehicle monitoring, etc., all require large field of view images. Wide-angle lenses can obtain images with a larger field of view than ordinary lenses, so as to obtain more target information. However, the large viewing angle of the wide-angle lens inevitably brings geometric distortion of imaging, the most important of which is barrel distortion. Only about 10% of the field of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 玉振明杨秋慧彭金虎玉昊昕
Owner 玉振明
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