空间全方位可视编码基准尺的设计和识别

Design and Detection of Omnidirectional Coded Sale Bar

为了解决大尺寸近景摄影测量中基准尺的成像角度限制问题,设计了一种全方位成像基准尺,该基准尺采用球形自反射标志点代替平面标志点,并设计了用于基准尺自动识别定位的条形编码标志环,实现了基准尺在测量空间的全方位成像。针对设计方案,设计了全方位基准尺识别算法,并通过实验验证了算法的有效性,证明该基准尺适用于大尺寸近景摄影测量系统。

In order to overcome the restriction of photo taking directions in close range photogrammetry,this paper proposes the design of an omnidirectional coded scale bar that is visible in any spatial direction. The scale bar incorporate spherical retro reflect targets and newly designed bar code rings and enables imaging and detecting of the scale bar in all directions in 3 D space. Additionally,according to the scale bar design,the paper proposes algorithms to detect and decode the scale bar in image. The scale bar is employed in close range photogrammetry and proves capable of enlarging imaging orientation. Experiments are also conducted to validate effectivity of the bar detection algorithm. Experiment results show that the scale bar is quite suitable for large scale close range photogrammetry.