Correction method for fisheye image distortion

A fisheye image and correction method technology, applied in image enhancement, image data processing, graphics and image conversion, etc., can solve problems such as difficult measurement, difficult implementation, complex algorithm model, etc., and achieve simple operation, high accuracy, and convenient implementation Effect

Inactive Publication Date: 2015-04-22
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] For the polar coordinate distortion correction model, aiming at the shortcomings of the traditional construction projection model, transformation from 2D and 3D spaces, etc., because the algorithm model is complex, measurement is difficult, and it is difficult to implement in engineering, the present invention proposes a fisheye image distortion method. Correction method, this method uses the distortion coefficient calibration method and uses the bilinear interpolation method for grayscale interpolation, which is easy to implement and makes the image to be corrected better restored

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  • Correction method for fisheye image distortion
  • Correction method for fisheye image distortion
  • Correction method for fisheye image distortion

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Embodiment Construction

[0061] The invention provides a method for correcting fisheye image distortion, which specifically includes the following steps:

[0062] 1] Obtain the fisheye image of the standard test grid plate and the actual image corresponding to the fisheye image;

[0063] 1.1] Fix the camera device on the bracket, place the standard test grid plate vertically in front of the camera device, and call the camera device a camera, the camera is connected to a monitor, and the monitor is used to display the images collected by the camera; adjust the standard test grid The distance between the grid plate and the camera fills the edge of the standard test grid plate with the field of view of the entire monitor; among them, the bracket can be selected as a six-dimensional adjustment frame, and the standard test grid plate can be selected as a square standard with a grid spacing of 1.5-2cm Test the grid plate; the camera can use a camera with a field of view of 128°×95.2°;

[0064] 1.2] Adjust ...

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Abstract

The invention discloses a correction method for fisheye image distortion. The method includes the following steps that firstly, a fisheye image of a standardized test grid plate and an actual image of the fisheye image are obtained; secondly, distortion measurement is conducted on the obtained fisheye image, and distortion coefficients are calibrated according to a polar coordinate model; thirdly, correction is conducted according to a correction model, and in order to guarantee correction precision, sectioned correction is conducted according to a central view field, a middle view field and an edge view field during correction; fourthly, pixels obtained after spatial alternation are endowed with corresponding gray values through a bilinear interpolation method so that the gray value of an original position can be restored. Reverse operation is simple, measurement precision is high, and the correction method is easily achieved in hardware systems such as an EPGA and a DSP. The correction method has high practical value.

Description

technical field [0001] The invention belongs to the technical field of image processing in large field of view imaging technology, in particular to a method for correcting fisheye image distortion. Background technique [0002] The field of view range of the lens of an ordinary camera is small, and the captured image cannot reflect all the information of the captured scene as effectively as possible. With the speed development of signal processing, the wide application of network transmission, and the improvement of computer processing speed, fisheye lenses have been widely used due to the simple and high-quality super-large field of view images. Nowadays, fisheye lenses are used in visual observation, visual measurement and Fields such as localization, visual navigation, and visual computing all play an important role. [0003] The fisheye lens is a special ultra-wide-angle lens. Its visual effect is similar to that of a fisheye to observe the scenery on the water. The fis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T3/40
Inventor 王泽锋曹剑中陈耀弘黄继江张志张兆会张海峰张凯胜
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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