摘要
在工业数字摄影测量中,当被测物大而复杂时,目标像片的数量可能达到数百张,像点达到几千个,因此人工去识别这些像点是不切实际的,不但费工费时而且也加大了出错率。为了实现工业数字摄影测量的自动化,引入了一种点状编码标志,讲述了其设计原理,并应用透视投影中交比不变量和仿射变换对其进行了识别。试验表明,该编码标志点设计严密,自动识别率为100%,可以满足应用要求。
In industrial digital photogrammetry with CCD cameras, the number of target images may amount to several hundreds and the number of image points may amount to several thousands when large and complex objects are involved. For realizing automatic measurement, a new coded target and its design principles were introduced in this paper. It could be recognized by cross ratio, which was a constant in perspective projection, and affine transformation. Experiments showed that the coded targets were strictly designed, with 100% identification ratio, which could satisfy the requirements of practical applications.
出处
《测绘科学技术学报》
北大核心
2008年第3期228-230,共3页
Journal of Geomatics Science and Technology
关键词
工业数字摄影测量
编码标志
交比
仿射变换
industrial digital photogrammetry
coded targets
cross ratio
affine transformation
