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Method and device for correcting image barrel distortion and image processing device

A technique for correcting images and barrel distortion, applied in the field of image processing

Inactive Publication Date: 2013-05-22
深圳市繁维科技有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a barrel distortion correction method, device and image processing device, which can solve the problem that the original technology has a large amount of computation and cannot process high resolution in real time. images, and use more expensive memory, the cost is higher

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[0022] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] see figure 1 , the method for correcting image barrel distortion of the present invention, it comprises the following steps:

[0024] Step S11: Forming a lookup table: forming a lookup table according to the relationship between the ideal coordinates of the pixels before image distortion and the distortion coefficient.

[0025] see figure 2 , step S11 includes the following steps:

[0026] Step S111: Calculate the distance R between the ideal coordinates and the origin in the x and y directions x , R y : Assuming that the coordinates (xc, yc) of the center point of the image are the origin, and the ideal coordinates are (x, y), it is obtained: R x =xc-x,R y =yc-y;

[0027]Step S112: Calculate K value: in, Δ is the width of the physical pixel of...

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Abstract

The invention provides a method for correcting image barrel distortion. The method comprises the steps of forming a lookup table according to relations of an ideal coordinate of pixels prior to image distortion and a distortion factor, calculating distances R<x> and R<y> of the ideal coordinates (x, y) on an x direction and a y direction relative to an original point, enabling a central point coordinate (xc, yc) (x, y) of an image be set to be the original point, and obtaining the equations that R<x>=xc-x and R<y>=yc-y; calculating a K value, calculating a distortion factor S, and obtaining the ideal coordinate corresponding to a distortion coordinate according to relations between the distortion coordinate and the ideal coordinate; endowing a pixel value of the distortion coordinate to the ideal coordinate, and forming a corrected image according to the ideal coordinate and the pixel value of the distortion coordinate. The invention further provides a device for correcting image barrel distortion and an image processing device. According to the method and device for correcting image barrel distortion and the image processing device, operation quantity can be reduced, barrel correction is achieved rapidly and effectively, a memory which is low in cost can be used, and the cost is reduced.

Description

technical field [0001] The present invention relates to image processing technology, in particular to a method, device and image processing device for correcting image barrel distortion. Background technique [0002] Barrel distortion is the distortion phenomenon caused by the lens that the imaged image expands in a barrel shape. We are most likely to notice barrel distortion when using a wide-angle lens or using the widest end of a zoom lens. Due to the defects of the camera lens itself, the image will be geometrically distorted when the objective lens is far away, which directly affects the processing and analysis of the image, so it must be geometrically corrected. At present, there are mainly two methods for geometric distortion correction of images: control point method and pattern method. Among them, the control point method includes the polynomial address correction method and the finite element method; the pattern method includes the external parameter address corr...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 徐渊周清海朱明程孙伟昶
Owner 深圳市繁维科技有限公司
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