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An Adaptive High Dynamic Range 3D Measurement Method Based on Gray Histogram

A gray histogram, high dynamic range technology, applied in the field of optical measurement, can solve the problems of inconvenient use, troublesome operation, lack of optical measurement methods, etc., to achieve the effect of improving efficiency, accurate results and high practical value

Inactive Publication Date: 2017-04-19
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Although this method can also solve the problem of high dynamic range, the operation of changing the light intensity of the projection device is cumbersome, and like changing the exposure method, the amount of light intensity change and the number of times of light intensity change cannot be determined in advance. So it is also not convenient to use
Therefore, at present, there is still a lack of optical measurement methods that can adapt to the high dynamic range according to the measured scene.

Method used

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  • An Adaptive High Dynamic Range 3D Measurement Method Based on Gray Histogram
  • An Adaptive High Dynamic Range 3D Measurement Method Based on Gray Histogram
  • An Adaptive High Dynamic Range 3D Measurement Method Based on Gray Histogram

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Embodiment Construction

[0014] The present invention is an adaptive high dynamic range three-dimensional measurement method based on grayscale histogram, which determines the reflectance distribution of the measured object and the optimal exposure required for each reflectance by analyzing the grayscale histogram of the measured object Time; using multiple exposure technology, according to the optimal exposure time required for each reflectivity, the object under test is exposed separately, and the images taken by the object under different optimal exposure times are obtained, and then the different optimal exposure time The images taken at different times are fused to restore the three-dimensional shape of the measured object. Such as figure 1 As shown, the specific steps are as follows:

[0015] Step 1: Use a projection device to project uniform white light to the object under test, and then use a camera to capture the object under test to obtain an image I 0 , while recording the captured image ...

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Abstract

The invention provides a self-adaptive high-dynamic-range three-dimensional measuring method based on a gray scale histogram. The method comprises: through analyzing the gray scale histogram of a measured object, determining the reflectivity distribution of the measured object and the optimum exposure time needed by each reflectivity; and using an exposure technology for multiple times, respectively exposing the measured object according to the optimum exposure time needed by each reflectivity, obtaining images of the measured object, shot in the different optimum exposure time, and then fusing the images shot in the different optimum exposure time so as to restore the three-dimensional morphology of the measured object. The method overcomes the blindness existing in a conventional high-dynamic-range measuring method and improves the measuring efficiency.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, in particular to an adaptive high dynamic range three-dimensional measurement method based on a gray histogram. Background technique [0002] Three-dimensional measurement is an important branch of modern precision measurement. It uses precise measuring equipment to obtain the geometric coordinate data of the surface of the measured object, so as to obtain the three-dimensional information of the surface of the measured object. With the rapid development and popularization of 3D printing technology, how to obtain real-time 3D data of dynamic objects in reverse design has become a research hotspot in the field of engineering technology at home and abroad. Traditional 3D measurement methods usually use 3D coordinate machines to obtain the geometric shape of the measured object. Its advantage lies in the high measurement accuracy, and because it is a contact measurement, this measuremen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
Inventor 陈钱冯世杰顾国华左超孙佳嵩喻士领胡岩
Owner NANJING UNIV OF SCI & TECH
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