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Wide-angle lens infrared image distortion correction method

A distortion correction and infrared image technology, applied in the field of correction, can solve problems such as image deformation, difficulty in realizing the target source of the equidistant grid, and affecting the accuracy and reliability of measurement parameters, so as to reduce image distortion and improve accuracy and reliability effects

Active Publication Date: 2016-09-21
SHANGHAI AEROSPACE CONTROL TECH INST
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Problems solved by technology

[0003] Due to the nonlinear optical distortion of the image due to the wide-angle lens, the image is severely deformed, which affects the accuracy and reliability of the measurement parameters
The existing distortion correction methods use equidistant grid points as the calibration template. If the target template is an equidistant grid, it is necessary to ensure that the template is parallel to the lens surface of the product when shooting the distorted image, and due to the thermal effect of the infrared image, Target sources for equally spaced grids are also more difficult to achieve

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Embodiment Construction

[0023] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, a wide-angle lens infrared image distortion correction method, the method includes the following steps:

[0025] S1, using a uniformly heated ball as a calibration template, photographing the original distortion map of the target calibration template, performing threshold segmentation and edge extraction on the original distortion map to obtain a distortion edge map, and the calibration template is a uniformly heated ball;

[0026] S2, establishing a distortion model according to the distortion edge map and obtaining a distortion coefficient;

[0027] S3, solving the new position of the edge pixel according to the distortion coefficient to realize the position transformation and generate the edge distortion correction map;

[0028] S4, using multiple fitting and bilinear interp...

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Abstract

The invention discloses a wide-angle lens infrared image distortion correction method. The method comprises steps that S1, an original distortion image of a target calibration template is shot, threshold segmentation and edge extraction of the original distortion image are carried out to acquire a distortion edge image; S2, a distortion model is established according to the distortion edge image, and a distortion coefficient is acquired; S3, the new position of an edge pixel point is solved according to the distortion coefficient, position transformation is realized, and an edge distortion correction image is generated; and S4, gray correction of the edge distortion correction image is realized by utilizing multiple times of fitting and a bilinear interpolation algorithm. The method can realized distortion correction of a wide-angle lens infrared image, an image distortion degree is reduced, and accuracy and reliability of measured parameters are improved.

Description

technical field [0001] The invention relates to a correction method, in particular to a correction method for infrared image distortion of a wide-angle lens. Background technique [0002] Geometric distortion is due to the fact that the large-field-of-view short-focus optical system does not satisfy the pinhole model, and the focal height of the chief rays of different fields of view after passing through the optical system and the Gaussian image plane is not equal to the ideal image height, making the actual image point deviate from the ideal image point. Among the distortions, the radial distortion has the greatest influence, and the tangential distortion is negligible. According to the principle of radial distortion, the distortion of each pixel point is only related to the distance from the point to the optical center, and has nothing to do with the coordinates of the point. [0003] Due to the nonlinear optical distortion of the image due to the wide-angle lens, the im...

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/80
Inventor 井丽红杨逸峰窦伟伍玲玲
Owner SHANGHAI AEROSPACE CONTROL TECH INST
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