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Lens Distortion Correction Method

A distortion correction, lens technology, used in image data processing, instrumentation, computing, etc.

Active Publication Date: 2017-11-14
ALTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a lens distortion correction method to compensate for the influence of the error caused by the lens center and the image sensor center during assembly on the distortion correction

Method used

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Embodiment Construction

[0020] Please refer to figure 1 and figure 2 , which is a flowchart and a schematic diagram of a lens distortion correction method according to the present invention. In the figure, the lens distortion correction method of the present invention is applicable to a lens comprising a lens group and an image sensing component, and the lens distortion correction method includes the following steps.

[0021] In step S1, the geometric correction model 20 is set in front of the lens 10. The geometric correction model 20 has a plurality of calibration marks (markers) 22, and provides the spatial coordinates of the plurality of calibration marks 22, and captures a to-be-corrected image through the lens 10. Image 30. In practice, the geometric calibration model 20 can be a plane model or a three-dimensional model, and the spatial coordinate system of the plurality of calibration marks 22 belongs to a global coordinate system.

[0022] figure 2 Also shown in is the deformed image 30...

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Abstract

The invention provides a lens distortion correction method, and aims to deal with the influence of error between the center of a lens and the center of an image sensor generated in assembly to distortion correction. The method is characterized in that when lens distortion correction is carried out based on the image coordinate transformation relation, spatial geometric correction is carried out and different image centers are chosen repeatedly to correct the image center of an image to be corrected in order to improve the accuracy of lens distortion correction.

Description

technical field [0001] The present invention relates to a correction method, in particular to a method for improving the accuracy of lens distortion correction by using spatial geometry correction. Background technique [0002] General optical instruments must use lenses, through the use of these lenses, the image can achieve the purpose of imaging. The image capture device itself is also a kind of optical instrument, and the light is imaged on a Charge Coupled Device (CCD) through a set of lenses. And imaging through these lenses or mirrors, the quality of the design of these lenses or mirrors will directly affect the quality of the imaging. [0003] Most of the image capture devices use lenses for image imaging. In addition to the problem of chromatic aberration in the imaging of the lens, another problem is the deformation and distortion of the image. There are two most typical types of distortion, one is barrel distortion (Barrel Distortion), the four sides of the imag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T3/00
Inventor 周宏隆王煜智张文彦王耀笙
Owner ALTEK SEMICON