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Method for camera self-calibration based on orthogonal vanishing points

A vanishing point, self-calibration technology, applied in image data processing, instruments, calculations, etc., can solve the problems of difficulty in ensuring the accuracy of results, complex calculation process, low robustness, etc., to reduce the human-computer interaction process and reduce equipment. Scenario requirements, the effect of reducing requirements

Active Publication Date: 2015-11-11
ZHEJIANG UNIV
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Problems solved by technology

[0007] The currently used camera self-calibration technology has the advantages of being convenient, flexible, universally applicable, and not affected by the external environment, but it also has many defects, the biggest of which is that the robustness is very low, the calculation process is complicated, unstable, and it is difficult to guarantee the results. the accuracy of

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  • Method for camera self-calibration based on orthogonal vanishing points

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with specific embodiments.

[0037] A camera self-calibration method based on orthogonal vanishing points, comprising the following steps:

[0038] (1) Perform straight line detection on the calibration scene image to obtain several parallel line segments,

[0039] In this embodiment, a feature point extraction method is used to perform line detection on the calibration scene image. The calibration scene image (that is, the image of the calibration object) should have enough straight line segments (at least four parallel line segments can be obtained), and the calibration objects should be mainly man-made objects, or natural scenery with obvious straight line edges.

[0040] (2) For any four line segments, perform the following operations:

[0041] (2-1) calculate the orthogonal vanishing point and camera focal length of these four line segments;

[0042] Due to errors in line detection, usually t...

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Abstract

The invention discloses a method for camera self-calibration based on orthogonal vanishing points, including the following steps: carrying out line detection on a calibration scene image to obtain a plurality of parallel line segments; for any n (n>=4) line segments, calculating the orthogonal vanishing point and camera focal length of the n line segments, and calculating a corresponding intrinsic parameter matrix according to the camera focal length and the orthogonal vanishing point; and acquiring a final intrinsic parameter matrix according to all the intrinsic parameter matrixes and based on a random sampling consistency approach. According to the method for camera self-calibration of the invention, all the line segments obtained through line detection are grouped. Through multiple groups of detection, the influence of error detection results in line detection can be effectively eliminated, and the accuracy of self-calibration results can be improved. Grouping facilitates parallel calculation and is beneficial to the improvement of self-calibration rate.

Description

technical field [0001] The invention relates to the technical field of high-resolution three-dimensional reconstruction, in particular to a camera self-calibration method based on orthogonal vanishing points, which is applied to the camera calibration process in high-resolution three-dimensional reconstruction based on photometric stereo technology. Background technique [0002] In image-based 3D reconstruction, the coefficients of the camera itself directly affect the accuracy of 3D reconstruction results. Therefore, obtaining accurate camera calibration results has a decisive impact on the results of 3D reconstruction algorithms. [0003] Currently commonly used camera calibration techniques are mainly divided into three categories: traditional camera calibration techniques, camera self-calibration techniques, and camera calibration techniques based on active vision. [0004] The traditional camera calibration technology adopts the mathematical transformation in the image ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 吕松刁常宇邢卫鲁东明
Owner ZHEJIANG UNIV
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