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Mobile terminal camera calibrating method

A mobile terminal and camera calibration technology, which is applied in image data processing, instruments, calculations, etc., can solve the problems of expensive calibration equipment and inconvenient operation

Inactive Publication Date: 2015-02-25
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a mobile terminal camera calibration method to accurately, efficiently, flexibly, and low-costly eliminate the geometric distortion of the image captured by the mobile terminal, improve the image quality, and solve the problem of traditional Calibration method Calibration equipment is expensive, inconvenient to operate and other problems

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Embodiment Construction

[0057] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0058] Mobile terminal camera calibration method, the calibration process is as follows figure 1 shown, including the following steps:

[0059] (1) Selection of calibration objects and design of calibration plates

[0060] Use the Photoshop drawing software to draw a black and white "chess board" image with the same grid size as the standard image to be taken, that is, the calibration object, such as figure 2 shown. There is an overlapping point in the middle of every four black and white interlaced squares, which is the center point of these four squares, called the corner point, and also used as the feature point used in the calculation of the later calibration parameters. If the distribution of corner points in the calibration object image is sparse, the calculation dat...

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Abstract

A mobile terminal camera calibrating method includes the steps of selecting a plurality of feature points on a calibration object, a black-and-white checkerboard image; using a mobile terminal camera to be calibrated to take at least two calibration object images; recognizing image space coordinates of the feature points in the taken calibration object images, and determining object space coordinates corresponding to the image space coordinates; according to a projection change relation of the image space coordinates (u and v) and object space coordinates (X, Y and Z) of the feature points, calculating calibration parameters, a principal distance component (fx and fy), an eccentric distortion coefficient (cx an cy), a radial distortion coefficient (k1, k2 and k3) and a tangential distortion coefficient (p1 and p2). The method is designed specially according to physical features of the mobile terminal camera; calculation of the calibration parameters of the mobile terminal camera is achieved; the problems such that the traditional calibrating method has long service time, is inconvenient to operate, high in prices and unsuitable for mobile terminals are solved; calculation results are precise and stable, and effective implementation of calibration of the mobile terminal camera and acquisition of high-quality images is forcibly guaranteed.

Description

technical field [0001] The present invention relates to the technical field of camera calibration, and in particular to a camera calibration method for a mobile terminal. Background technique [0002] As the third stage of the development of photogrammetry technology, digital photogrammetry has been widely used in 3D mapping, digital city, cultural relics protection and 3D navigation due to its characteristics of digitization of original data and product results and automation of processing process. [0003] In digital photogrammetry, image quality is one of the important factors that determine the precision and accuracy of post-processing data and final results. However, due to the limitations of the lens manufacturing process, raw material quality and other factors, the image inevitably contains geometric distortions such as straight line bending, rectangular miscutting, etc. that cannot be ignored. These distortions will cause problems such as loss of precision and image...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/80
Inventor 杨容浩李少达杨晓霞杨佳张博王鹏
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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