基于事件相机传感器的时序编码结构光系统设计

Design of temporal coded structured light system based on event-based camera sensor

结构光技术是一种非接触式的光学三维成像技术,通过测量投影图案在物体表面发生的形变,可以还原物体的三维特征信息。然而,目前已有的结构光系统设计方案存在算法复杂和帧率低的问题。为解决这些问题,提出了一种基于事件相机传感器的时序编码结构光系统。采用DLP(digital light projector,数字光投影仪)投影明暗交替的时序编码散斑图案,并利用事件相机传感器进行高速采集。通过对投影的散斑图案进行时序编码,就可以用散斑点搜索的方法代替复杂的空间匹配,从而降低结构光系统的算法复杂度。通过对散斑点的对应关系进行分析,最终恢复出空间物体表面的三维信息。经过实验验证,系统的采集帧率可达66.7 frame/s,且相对于传统方案,算法复杂度显著降低,测量精度可达毫米级。实验证明本文设计的时序编码结构光系统可以高速、低功耗地对实际场景进行三维重建。

Structured light technology is a non-contact three-dimensional optical imaging technology,which can restore the three-dimensional feature information of the object by measuring the deformation of the projection pattern on the surface of the object.However,the existing structured light system designing scheme has the problems of complex algorithm and low frame rate.In order to solve these problems,a temporal coded structured light system based on event-based camera sensor was proposed.The digital light projector(DLP)was used to project the temporal alternating light and dark coding patterns,and the event-based camera sensor was used for the high-speed acquisition.By encoding the time series of the projected speckle patterns,the speckle search method could be used instead of the complex spatial matching,thereby reducing the algorithm complexity of the structured light system.By analyzing the correspondence of scattered spots,the three-dimensional information of the surface of the space object was finally restored.After experimental verification,it is show that the acquisition frame rate of the proposed system can reach 66.7 frame/s.Compared with other traditional schemes,the complexity of the algorithm is significantly reduced,and the measurement accuracy can reach the millimeter level.Experimental results show that the designed temporal coded structured light system can perform three-dimensional reconstruction of actual scenes with high speed and low computation cost.