基于方向模板的结构光条纹中心检测方法

New Method for Obtaining the Center of Structured Light Stripe by Directi on Template

结构光条纹中心位置的准确检测是影响结构光系统精度的关键问题之一。在利用结构光系统获取距离数据时,会出现以下问题:第一,激光条纹的强度并不服从高斯分布和传感器引入的误差;第二,系统内部电子和软件引入的高斯白噪声。确定激光条纹中心传统的方法容易受到这些问题的影响。为了消除这些错误对数据的影响,数据需要低通滤波和平滑。但是如果对数据进行平滑,就会损失物体表面几何细节信息。文章提出了一种利用可变方向模板检测结构光条纹中心的方法,实验结果表明该方法能够准确地获取光条纹中心。

The accuracy of structured light methods hinges on the ab il ity to locate the'center'of the imaged stripe.There are two distinct types o f problems that arise in the measurement of range data:one is outliers,which are data points not obeying a Gaussian distribution and which are caused by sen sor errors;the other is Gaussian noise,which is caused by internal electronics and software.The standard methods for extracting range data from optical trian gulation scanners are liable to the influence of these problems.The data must b e smoothed and low-pass-filtered to remove the effect of these errors.However ,smoothing tends to blur discontinuities in the range data leading to a loss o f geometric information.New method presented in this paper starts by convolving a given image with masks in a selected number of directions.Results that demon strate the validity of the method are presented.