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A fast distortion correction method for ultra-wide-angle images

A distortion correction and ultra-wide-angle technology, applied in the field of image processing, can solve problems such as large amount of calculation, lack of camera parameter conditions, different photos from different sources, etc., to achieve good correction effect and low computational complexity.

Active Publication Date: 2019-07-09
深圳市优象计算技术有限公司
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Problems solved by technology

[0004] Most of the existing distortion correction methods require accurate calibration equipment to obtain a distortion correction formula for a specific lens, and use iterative optimization methods, which require a large amount of calculation
However, in the applied commercial system, the problems that may be encountered are: different photos come from different wide-angle or ultra-wide-angle lenses; the conditions for calibrating the camera parameters are not available; at the same time, high real-time processing capabilities are required, and high energy consumption cannot be consumed. resources, the current image distortion correction method cannot solve this problem

Method used

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  • A fast distortion correction method for ultra-wide-angle images
  • A fast distortion correction method for ultra-wide-angle images
  • A fast distortion correction method for ultra-wide-angle images

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] The longitude correction algorithm was first proposed by Mundhenk, which is a typical 2D image correction algorithm. This algorithm mainly uses the spherical meridian to approximate the distortion of the fisheye image based on the imaging characteristics of the fisheye lens. The longer the longitude, the more twisted it is. Its warped scene can be used with figure 1 Longitude, that is, all pixels on a longitude have the same column coordinate value in the distortion-corrected image, such as figure 1 (a) in a(x a ,y a ) and b(x b ,y b ) on the same longitude curve, the correction points corresponding to the points on the longitude curve are all on the straight line L, record a(x a ,y a ) and b(x b ,y b ) points corresponding to the correction points are a'(x',y a ) and b′(x′,y b ), we can see that point a(x a ,y a ) and its correction point a′(x′,y ...

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Abstract

The invention discloses an ultrawide-angle image oriented rapid distortion correction method. An image is corrected by a longitude model. Firstly a spherical center and an initial radius are determined through image distortion characteristics; then the size of the radius is optimized for the position of each pixel; space coordinate transformation of an original image and a correction image is performed through coordinate transformation; and finally color information is acquired through bilinear interpolation. According to the ultrawide-angle image oriented distortion correction method, ultrawide-angle image rapid distortion correction can be realized through low computational complexity, and a great correction effect can be obtained so that the method is suitable for application of various consumer grades of commercial systems.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an ultra-wide-angle image distortion correction method. Background technique [0002] The angle of view of an ordinary lens is about 30 degrees, while the angle of view of a wide-angle lens is generally 90-120 degrees, and an ultra-wide-angle image even reaches 150 degrees. Wide-angle lenses have a wider field of view than ordinary lenses, and can contain more information in one image, so they are widely used in security monitoring, industrial medicine, intelligent transportation and other fields. However, while the imaging system using a wide-angle lens provides a wide range of imaging, it also brings relatively serious image distortion, which makes the captured image deformed to a certain extent. This kind of geometric distortion of the image causes the captured image not to be in good agreement with the real object, which not only affects the visual effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00
CPCG06T3/0018
Inventor 罗文峰
Owner 深圳市优象计算技术有限公司
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