基于结构光场辅助的面阵定位投影标示技术研发

Research on Area Array Projection Positioned Indication Based on Structured Light Field Aid

以一套数字光处理面阵投影装置和一个工业相机作为基本硬件平台,研发了三维定位标示原型系统i-Guider,阐述了i-Guider系统的工作原理和关键技术。在数字光处理投影仪中固化一组正弦相移条纹结构光图像,将投影仪作为逆成像装置,在结构光场的辅助下利用一块平面标定板实现相机–投影仪内外参数的精确标定。对于三维数模上的曲线轮廓、操作说明等操作信息,提出一种现场自动生成标示信息定位投影图像的方法,并通过HDMI端口将现场生成的标示信息投影图像传递给面阵投影仪,实现操作信息在三维工件实物上的精确定位标示。以一个机身蒙皮试验件为对象,开展了蒙皮定位钻铆三维标示试验,结果表明,i-Guider系统定位投影标示精度在0.25 mm以内,且具有良好的三维定位标示效果。

Using a digital light processing(DLP)projector and an industrial camera as main hardware platform,developed an integrated prototype system of 3D measurement and positioned indication,namely i-Guider.The working principle and key techniques of i-Guider system were described.A set of sinusoidal phase shift fringes were loaded in the memory of the DLP projector,which was taken as an inverse imaging device.The camera-projector system was calibrated by using a planar board with the aid of structured-light projection.A method was proposed to automatically generate the 2D projecting images of pre-defined 3D indications,such as specific curve features and operation instructions on the CAD model of the workpiece.The projecting images were sent to the projector via HDMI to achieve accurate positioned indications on the real workpiece.A positioned indication experiment on aircraft skin riveting was performed,in which i-Guider system had exhibited excellent performance.Experiments show that the positioned indication error is within 0.25 mm.