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Technical method for calibrating (lofting) ground point through mobile phone photography

A ground point and mobile phone technology, applied in the direction of measuring point marking, etc., can solve the problems of cumbersome instrument operation, high instrument price, and not easy to carry, and achieve the effect of low price, simple operation, and reduced field equipment and labor costs

Active Publication Date: 2018-12-18
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0003] In order to overcome the shortcomings of the traditional ground coordinate point calibration (stakeout) work, the instrument is expensive, bulky and difficult to carry, and the instrument operation is cumbersome and requires certain professional skills. This invention proposes a technical method for mobile phone camera calibration (stakeout) ground points

Method used

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Embodiment Construction

[0014] A technical method for calibrating (staking out) ground points by mobile phone photography is different from existing methods, specifically in that:

[0015] It is known that the object space coordinates of two control points A and B are (x A ,y A ,H A ) and (x B ,y B ,H B ), using a smart phone with a camera function and three benchmarks with a length of L and a scale as tools. Coordinate point to be calibrated (staked out) C(x C ,y C ,H C ) in the field calibration (stakeout), the specific steps are as follows:

[0016] 1) Place two benchmarks of length L vertically at two known control points A and B, place the smartphone with camera function at the photographic point S that can communicate with points A and B, and set the attitude of the mobile phone Adjust until the inclination angle is 0° or the main optical axis of photography is parallel to the bottom surface, and take a picture containing control points A and B, where the coordinates of the bottom and ...

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Abstract

The invention discloses a technical method for calibrating (lofting) a ground point through mobile phone photography. According to the method, under the condition that at least two control point object space coordinates are known, a smartphone with a known focal camera function and three poles with known length and scales are used as tools, and photogrammetry, coordinate transformation and other principles are utilized to complete the work of performing on-spot calibration (lofting) on a to-be-calibrated (lofted) point with known object space coordinates. Through the method, it is not needed to carry professional measurement equipment, and the calibration (lofting) task of the ground point can be completed economically and efficiently.

Description

1. Technical field [0001] The invention relates to a technical method for calibrating (staking out) ground points, in particular to a technical method for calibrating (staking out) ground points by mobile phone photography. 2. Technical Background [0002] Coordinate calibration is to use certain measuring instruments and methods to measure the plane position and elevation of the designed buildings or structures and other ground objects to the field survey work according to the design and construction requirements. Coordinate stakeout is also called coordinate calibration. At present, the commonly used surveying and mapping methods mainly include calibration methods such as compass, total station and RTK. However, since the commonly used instruments for calibration are relatively heavy and the operation is relatively complicated, certain professional knowledge is required to complete. However, when calibration (stakeout) work is required in some industries and the accuracy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/02
CPCG01C15/02
Inventor 冯仲科杨立岩
Owner BEIJING FORESTRY UNIVERSITY
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