Fast high dynamic range three-dimensional measurement method

A high dynamic range, three-dimensional measurement technology, applied in the field of optical measurement, can solve problems such as unsuitable for measurement, difficult to restore three-dimensional contour, object surface texture dependence, etc.

Inactive Publication Date: 2015-11-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Although the passive method can effectively obtain the three-dimensional information of the surface of the measured object, it has two main disadvantages: the amount of calculation is very large, and a high-speed processor is usually required to realize the measurement; the excessive dependence on the surface texture of the object makes this method not suitable for measuring smooth or Surfaces with fewer feature points
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  • Fast high dynamic range three-dimensional measurement method

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Embodiment

[0055] In this embodiment, the measured object such as figure 2 Shown is a drinking glass with a specular surface. The projection of four grating fringes generated by the step 1 of the present invention is used for measurement. When the polarizer is not added, the three-dimensional measurement results are as follows: Figure 5 As shown in (a), it can be clearly seen that there are pits on the surface of the high light area, indicating that the existence of high light affects the measurement of this part of the surface. After adding a polarizer on the optical axis of the projector and the optical axis of the camera according to step 2 according to the method of the present invention, the four fringe images collected are successively as follows: image 3 As shown in (a) to (d), from image 3 It is not difficult to find that the original highlights have been weakened. Then, use Fourier contouring in step 3 to image 3 The fringe image shown in (a) is analyzed to obtain the h...

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Abstract

The invention provides a fast high dynamic range three-dimensional measurement method. The method comprises the steps that a four-amplitude grating strip is generated by a computer; two polarizer are respectively placed on the optical axis of a projector and the optical axis of a camera; any one polarizer is rotated; the angle between the optical axis of the projector and the optical axis of the camera is set to be 90 degrees; the projector is used to project the generated four-amplitude grating strip to an object to be measured; the camera is used to synchronously shoot a four-amplitude strip image generated by the reflection of the object to be measured; the four-amplitude strip image is analyzed to acquire a high frequency wrapped phase and low frequency phase; the high frequency wrapped phase is unwrapped to acquire a high frequency unwrapped phase; and according to the unwrapped phase, the three-dimensional scene of the measured object is reconstructed. The fast high dynamic range three-dimensional measurement method provided by the invention can carry out high dynamic range three-dimensional measurement on a dynamic scene.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and in particular relates to a fast three-dimensional measurement method with high dynamic range. Background technique [0002] The optical three-dimensional measurement method has become an important means for people to obtain three-dimensional profile data due to its advantages of non-contact, high precision and easy implementation. According to different lighting methods, optical three-dimensional measurement is usually divided into active and passive three-dimensional measurement. Passive 3D measurement uses two or more cameras to shoot the measured object from different angles, and recovers the 3D information of the measured surface from the acquired 2D images. The advantage of this type of method is that the measurement system is simple and the data collection is convenient, so it has a wide range of applications in machine vision. The binocular vision method is a representati...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 陈钱冯世杰顾国华左超张玉珍陶天阳张良孙佳嵩胡岩张佳琳
Owner NANJING UNIV OF SCI & TECH
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