A precision and high efficiency three-dimensional measuring method

A three-dimensional measurement and measured technology, applied in the field of three-dimensional measurement, can solve problems such as inability to measure, increase workload, and difficult layout, so as to improve measurement efficiency and reduce difficulty

Inactive Publication Date: 2007-05-16
李啸炜 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, they can only measure a certain characteristic quantity at a time, and cannot measure many characteristic quantities of a certain target at the same time, such as measuring the length, width, height and distance between different parts of a certain house. It is necessary to repeat the layout and measure multiple times, which will inevitably increase the workload
Secondly, they must measure the accessible target, because the instrument must be placed at a certain point of the target to be measured. If the target is far away, not easy to approach, or the terrain is complex and difficult to layout, it will increase the difficulty and error of measurement

Method used

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  • A precision and high efficiency three-dimensional measuring method
  • A precision and high efficiency three-dimensional measuring method
  • A precision and high efficiency three-dimensional measuring method

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Embodiment Construction

[0023] In the embodiments described in detail below, the method provided by the present invention completes the non-contact measurement of a specific target, which is a house to be evaluated.

[0024] First select a benchmark with a marker point as the marker, and place it in the middle of the camera and the house. The distance between the marker points on the benchmark is known. Then use an ordinary household handheld camera to shoot the house. The movement route is best to be an arc, from the front left to the front right of the house, and to ensure that the house and the marker are always in the field of view. Shoot a video sequence of about 500 frames for a period of 20 seconds.

[0025] Input the video sequence into the computer for processing. First, use the KLT feature tracker to track 500 frames of video, and get about 9,000 feature point tracks of different lengths. A large part of these trajectories are short in length or contain outliers in the middle, so they are very ...

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Abstract

This invention provides one method to process non-contact three dimension measurement, which comprises the following steps: user uses handle cameral to catch aim to be tested and to put label within visual field to get visual sequence into computer through steps of characteristic point tracing, key frame extracting, radio establishing, self-locking, oral re-establishing to restore the field three dimensional structure composed of measurement aim and label; the structure size can be determined by label geometry information; user selects two points with relative space distance automatically computed out.

Description

Technical field [0001] The invention relates to a non-contact three-dimensional measurement of a target, and is particularly suitable for measuring targets that are not easy to contact, have a long distance, or have a complex scene, and have high accuracy. Background technique [0002] Measurement technology has played a very important role in the construction of the national economy. It obtains the geometric information of the target by measuring distance, angle, etc., and is widely used in engineering design, auxiliary construction, structure evaluation, deformation monitoring and other tasks. Commonly used measurement methods are: 1. Direct measurement with the help of measuring tools, such as steel ruler, standard stem, drill hole measuring and plumb bob, etc. Taking steel ruler distance as an example, it needs to go through alignment piling, measuring distance, measuring pile top elevation, Calculate the length of the ruler, and finally get the distance value. 2. Use optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/04G01B11/02G01B21/02G06T1/00
Inventor 李啸炜侯丹
Owner 李啸炜
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