基于条纹投影的高动态范围三维测量方法研究
毕业论文关键词 最优曝光时间 不同的反射率 稳定环境 高动态范围测量
Title Fringe Projection Based High Dynamic Range Three-dimensionalMeasurement
Abstract In traditional ways of three-dimensional shape measurements, measurements usingways of contacting often have many limitations in the processing of measurments.For example, it will bring deviation in the measurement if the object is with softsurface, and the whole processing damage the surface of the object to some degreesbecause of contacting, what is worse, this kind of method usually means lowefficiency. In recent years, with the development of three-dimensional shapemeasurement using the fringe projection technique, it has haven wide applicationsin many aspects in different vocations, and it gets a lot of attention, developsto the further step at the same time. More and more people realize this method’scharacter of high-efficiency, rapid scientific output and ignorance of adverseeffects using contact measurements.This paper studies high dynamic range three-dimensional measurement using thefringe projection technique, realized the non-contact measurement forthree-dimensional objects with high and low reflectivity at the same time throughprogramming. in the processing of acquiring programming and the four-step phaseshifting algorithm, we get some groups of time of exposure, we reconstruct the3D shape using the methods of grouping、calculation、comparison and integration,remove the noise using glimmer to reach the accurate measurement.Except the general steps of the above, it still need to be carefully consideredthat factors influence the experiment in other aspects.To ensure the smoothprogress through the whole experiment, the selection of proper exposure time isnecessary, if the exposure time is too long, then it will make the brightness of the picture too high, if the exposure time is too short, can lead to the lowbrightness. And for objects of different reflectivity, respectively the optimalexposure time is different also. Our object under test are of high reflectivityand low reflectivity material at the same time, so it need to be integrated tochose the proper optimal exposure time for both of them,which requires we havethe idea of grouping and optimization. To ensure the stability of the environment,as well as the reference of previous experiments by the line of thinking is alsothe essential content in the whole experiment design.
Keywords the optimal exposure time different reflectivity the stability of theenvironment high dynamic range measurement
目 次
1 绪论 1
1.1 选题背景与研究意义 1
1.2 国内外研究现状 2
1.3 本论文的主要内容 3
2 传统高动态范围测量方法 4