基于傅里叶变换的三正弦码标尺定位算法研究  

Study on Positioning Algorithm of Triple Sinusoidal Bar Code Staff Based on Fourier Transform

作　　者：张晓[1] 王志兴[1] 李相银[1] 

机构地区：[1]南京理工大学理学院,南京210094

出　　处：《光子学报》2007年第1期128-132,共5页Acta Photonica Sinica

摘　　要：研究了三正弦码标尺应用于电子水准测量中实现标尺自动化读数的定位算法.在频域通过提取特征谱线位置计算物像比及视距,利用其相位进行几何定位并获取各码条等效宽度.求解像面上首码字中各周期码的相位值,根据其组合确定标尺粗读;通过几何定位得到视准线与首码字的相对距离,与粗读相结合得到标高读数.实验测量准确度满足实际需要,表明了该算法的可行性.The positioning algorithm was studied of the triple sinusoidal bar code staff used in digital leveling to accomplish automatic staff reading. Signal recognition in frequency domain was made to calculate the magnification and further the sight stadium by detecting the characteristic spectral line and to perform geometric positioning as well as stripe equivalent widths calculation via the phase information of the characteristic spectral line. From the three phases combination in the first code word on the image plane, the coarse reading can be gotten. The fine reading was the relative distance between the collimation line and the very code word which can be obtained through geometric positioning. Then the final height reading was the sum of coarse reading and fine reading. The measurement precision in the experiment mets the practical need, which indicated the feasibility of this algorithm.

关 键 词：条码定位 物像比 特征谱线 反卷积 相位值 

分 类 号：TB92[一般工业技术—计量学]