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Lens distortion correction method

A technology of lens distortion and lens, which is applied in the field of lens distortion correction, can solve the problems of increasing the amount of calculation, and achieve the effect of reducing the amount of calculation, improving image quality, and simple calculation

Active Publication Date: 2013-05-29
四川九洲投资控股集团有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This requires multiple calculations of different sample values ​​of k using the distortion model, which greatly increases the amount of calculation

Method used

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Embodiment Construction

[0023] A preferred embodiment of the lens distortion correction method of the present invention:

[0024] The principle of the present invention will be described in detail below in conjunction with the drawings and specific embodiments. And describe each step in detail.

[0025] Step S1: Take a piece of ordinary white paper, and make a reference circle, the center of which is O, and the radius is R. Select N points on the circle as reference points.

[0026] The selection of the number of reference points here is arbitrary, but in actual implementation, it can be considered in combination with the radius: if R is a larger value, then N selects more points; if R is a smaller value, then N selects fewer points . as attached figure 1 As shown, R=2cm, N=8.

[0027] Step S2: Use the lens to be corrected to photograph the reference circle, measure the distance between N points on the circumference of the reference circle after the lens to be corrected and the center of the cir...

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Abstract

The invention relates to a lens distortion correction method. The lens distortion correction method comprises the steps of: (1) drawing a reference circle required by lens correction on a plane; (2) shooting the reference circle through a lens to be corrected to acquire a shoot distortion graph; (3) acquiring circle radius values r1, r2, L and rn of N points after the lens distortion; and (4) performing arithmetic mean processing on the circle radius values r1, r2, L and rn of the N points after the lens distortion to obtain a distorted circle radium average value. The lens distortion correction method can conveniently use a lot of sampling points to calculate distortion factors, a lot of sampling points are used, accordingly arithmetic mean of the sampling points can replace statistical averaging to a large extent, calculation result of distortion factors is enabled to be more accurate, and correction effect after the lens distortion correction is better. A coordinate position correction chart generated by the lens distortion correction method can greatly relieve calculated amount during the correction process, and the method has high efficiency especially on distortion correction of continuous videos.

Description

technical field [0001] The invention relates to a method for correcting lens distortion. Background technique [0002] Image quality processing is a variety of technical processing for image signals to perform various transformations to achieve better image quality. At present, various processing technologies for image quality, including image noise reduction, contrast enhancement, edge enhancement, etc., can all play a role in improving and enhancing the image quality. [0003] Before the image sensor acquires image information, it must be imaged through the lens. Physically, since the lens is composed of various lenses, the subject becomes curved after being imaged by the lens. Reflected on the image, the captured object becomes curved, which is the distortion of the lens. Due to distortion, objects seen in an image lose their original correct shape. Usually we can reduce distortion in two ways: 1. Change the shape of the lens for a single lens, and use the best shape ...

Claims

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Application Information

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IPC IPC(8): H04N5/357
Inventor 周勇孙彬阮思恩
Owner 四川九洲投资控股集团有限公司