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Smartphone self-calibration method without controlling information

A technology for smart phones and information control, applied in measurement devices, instruments, etc., can solve problems such as occupying space, and achieve the effects of easy implementation, fast calibration speed, and high calculation accuracy

Inactive Publication Date: 2017-03-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the focal length is not fixed, it means that the mirror group in the lens moves back and forth, which will take up more space, which is unbearable for smartphones that emphasize slimness and lightness

Method used

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  • Smartphone self-calibration method without controlling information
  • Smartphone self-calibration method without controlling information
  • Smartphone self-calibration method without controlling information

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Experimental program
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Embodiment Construction

[0032] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0033] In the imaging process of smartphones, when the shooting distance, that is, the object distance u changes, since the focal length F is fixed, the image distance v, that is, the main distance f, will change accordingly. When the shooting distance exceeds 4m, the photographic scale is about 1 / 1000, and the principal distance f is very close to the focal length F. For the multiple images taken, as long as the shooting distances are roughly equal, the imaging clarity is also close. Compared with one of the reference images, even if the object distance fluctuates slightly in other images, the impact on the main distance is minimal. Therefore, in the case of ensuring that the object distance is roughly equal each time, using a smartphone to calibrate its camera while completing a certain measurement task can not only minimize the influence of the ob...

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PUM

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Abstract

The invention provides a smartphone self-calibration method without controlling information. The smartphone self-calibration method comprises the following steps: acquiring image data based on a 3*3 mode; selecting a standard image for relative orientation, and establishing a unit model; carrying out model connection based on a proportionality coefficient, and establishing a free network model; establishing a self-calibrating bundle free network adjustment model; calculating by combining adjustment, and acquiring camera calibration parameters. The smartphone self-calibration method provided by the invention, is not required to control the information and is not limited by a high-accuracy three-dimensional calibration field or a calibration template of a known space structure, just a smartphone is required to shoot 3*3 images, the requirements on position accuracy of each shot image is low, and implementation is easy.

Description

technical field [0001] The invention belongs to the field of digital photogrammetry, in particular to a method for self-checking and calibrating smart phones without control information. Background technique [0002] The high-precision calibration of the camera is a key step in digital photogrammetry. Cameras in photogrammetry include measurement cameras and non-measurement cameras. Although professional measurement cameras have very high precision, they are relatively expensive and have high application costs. Non-measuring cameras are cheap, flexible and convenient to use, and have increasingly mature performance. They are more and more widely used in photogrammetry and computer vision. With the advancement of hardware technology and the development of mobile Internet, smartphones, as a non-measurement device, are becoming more and more popular and the imaging accuracy is increasing. The use of photogrammetry has become an important means of surveying and mapping. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 赵双明付兵杰
Owner WUHAN UNIV