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A smart phone self-checking and calibrating method without control information

A smart phone and information control technology, which is applied in the direction of measuring devices, instruments, etc., can solve the problems of occupying space, etc., and achieve the effects of easy implementation, high calculation accuracy, and fast calibration speed

Inactive Publication Date: 2019-05-17
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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  • A smart phone self-checking and calibrating method without control information
  • A smart phone self-checking and calibrating method without control information
  • A smart phone self-checking and calibrating method without control information

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Embodiment Construction

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

[0033] In the process of smartphone imaging, 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 main distance f is very close to the focal length F. For multiple images shot, as long as the shooting distances are roughly the same, the imaging sharpness is also close. Compared with one of the benchmark images, even if the other images have slight fluctuations in the object distance, the effect on the main distance is minimal. Therefore, in the case of ensuring that the object distance is roughly the same for each shot, using a smartphone to calibrate the camera while completing a certain measurement task can not only minimize the influence ...

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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, and particularly relates to a smart phone self-checking and calibration method without control information. Background technique [0002] High-precision calibration of cameras is a key step in digital photogrammetry. Cameras in photogrammetry include measurement cameras and non-measurement cameras. Although professional measurement cameras have very high accuracy, they are relatively expensive and have high application costs. Non-measurement cameras are cheap, flexible and convenient to use, and their performance is becoming more and more mature. They are more and more widely used in photogrammetry and computer vision. With the advancement of hardware technology and the development of the mobile Internet, smart phones, as a non-measurement device, are becoming more and more popular, and the imaging accuracy is increasing. Photogrammetry using it has increasingly become an important surveyi...

Claims

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Application Information

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