摘要
针对离焦投影二值条纹生成正弦条纹进行测量时,条纹对比度和测量景深降低的问题,提出了一种聚焦投影二值编码条纹的结构光测量方法。以正弦条纹单周期内的强度值为规律,对二值条纹进行编码。按特定方式对编码后的二值条纹进行处理后,可生成用于实际测量的正弦相移条纹。同时,结合二加一相移算法进行改进,复用获取正弦条纹的二值条纹来生成测量所需的背景灰度图像,减少一幅均匀平面图案的投影,进而提高测量速度和精度。实验结果表明,所提方法以标准球为实验对象,测得的均方根误差为0.0425 mm。在投影仪全程聚焦的情况下,采用二值条纹进行测量,在避免非线性影响的同时,能够减少对正弦条纹对比度和测量景深的影响,进而可获取高精度的重建结果。
Considering the problem of the reduced fringe contrast and measured depth of field when the defocused projection of binary fringes is used to generate sinusoidal fringes for measurement,a structured light measurement method based on the focused projection of binarycoded fringes is proposed.Taking the intensity value of sinusoidal fringes in a single cycle as the law,the binary fringes are encoded,and the encoded binary fringes are processed in a specific way to generate sinusoidal phaseshift fringes that can be used for the actual measurement.Meanwhile,with the twoplusone phase shift algorithm,the background gray image required for the measurement generated by the binary fringes is reused,which reduces the projection of a uniform plane pattern and improves the measurement speed and accuracy.The experimental results indicate that by taking the standard sphere as the research object,the proposed method can achieve a measured rootmeansquare error of 0.0425 mm.When the projector is in focus all the time,binary fringes are employed for measurement,which can avoid the influence of nonlinearity,reduce the influence on the contrast of sinusoidal fringes and the measured depth of field,and yield highprecision reconstruction results.
作者
严飞
祁健
刘银萍
吴迪
刘佳
Yan Fei;Qi Jian;Liu Yinping;Wu Di;Liu Jia(School of Automation,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China;Jiangsu Provincial Collaborative Innovation Center for Atmospheric Environment and Equipment Technology,Nanjing 210044,Jiangsu,China;School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第22期76-83,共8页
Acta Optica Sinica
基金
国家自然科学基金(61605083)
江苏省产业前瞻与关键核心技术重点项目(BE2020006-2)。
关键词
测量
三维测量
离焦投影
二值编码
条纹对比度
测量景深
measurement
threedimensional measurement
defocused projection
binary code
fringe contrast
depth of field measurement
