摘要
格雷编码法以其鲁棒性和抗噪性被广泛应用于结构光投影的三维重建中。为了将格雷码应用到实时测量当中,使用多灰度格雷码以减少投影幅数,提高测量效率。然而在以彩色物体为对象进行三维测量的过程中,由于不同颜色部分的反射率存在差异,导致三维重建中的条纹顺序混乱,而多阶灰度也使色度导致的误差大大增加。为了适应彩色物体的三维实时测量,提高抗色彩干扰的特性,提出了一种基于HSI彩色空间的多级灰度码解调方法。采用HSI空间中的强度I代替RGB空间中的灰度进行多级灰度编码解码和条纹阶提取,同时也可以重构出物体表面的颜色纹理,而无需单独投影捕获额外的白光图。实验结果表明,该方法可以有效地纠正彩色物体由于色度引起的级次纠缠,减少级次误差。在彩色纹理物体的实时三维测量中具有广阔的应用前景。
Gray coding method is widely used in 3D reconstruction of structured light projection because of its robustness and noise resistance.In order to apply gray code method to real-time measurement,multi-level Gray code is used to reduce the number of projection amplitude and improve the measurement efficiency.However,in the process of three-dimensional measurement with color objects,because of the difference in reflectance of different color,the fringe order in 3D reconstruction may be confused,and the error caused by chroma is obviosly increased by multiple gray levels.In order to adapt to real-time measurement for color objects and improve the characteristic of anti-color interference,a multi-level Gray code demodulation method using HSI color space is proposed.Intensity in HSI color space instead of the gray in RGB space is used in multi-level Gray code decoding and fringe order extraction,at the same time,the color texture of the object surface can also be reconstructed without capturing additional auxiliary color texture patterns.Experimental results show that this method can effectively correct the order entanglement caused by color object chroma,and reduce errors in fringe order.It may play a prospective application in real-time 3D measurement for color texture object.
作者
冉龙轶
曹益平
RAN Long-yi;CAO Yi-ping(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China)
出处
《光学与光电技术》
2024年第1期18-28,共11页
Optics & Optoelectronic Technology
基金
国家自然科学基金(62375188)资助项目。
关键词
彩色三维测量
正弦条纹投影技术
时间相位展开
多阶灰度格雷码
HSI空间
级次纠缠
color 3D measurement
fringe projection technique
temporal phase unwrapping
multi-level Gray code
HSI space algorithm
order entanglement
