在线视觉检测过程及图形化输出

在线检测是提高产品加工精度的有力保证,视觉检测技术是利用机器视觉原理,对物体的几何尺寸进行准确定量的非接触检测 形化输出直观地显示在线测量结果,得于对加工生产线的分析和调整,两者的结合可以尽量减少废品,实现“零废品”工程。     

Solution for vision occlusion based on binocular line-structured light

Aiming at the problem of the loss of 3D point cloud, due to the occlusion of the field of view in the 3D measurement process, a measurement scheme based on line-structured light with dual-camera is given. In addition, in the line-structured light measurement technology, the traditional light plane calibration is more complicated, and the three-dimensional measurement accuracy is relatively low. For this reason, this paper used the binocular polar line constraint to calibrate the physical parameters of the light plane. Experimental results show that the dual-camera measurement system can obtain high-precision global measurement results. The maximum measurement error is 0.091 51 mm, and the average measurement error is 0.076 05 mm. Compared with the traditional binocular matching method and the traditional laser triangulation method, this method can deal with the problem of field occlusion more effectively, thereby reducing the loss of measurement information in the measurement process.     

Steering knuckle diameter measurement based on optical 3D scanning

Three-dimensional（3D） modeling of medical images is a critical part of surgical simulation. In this paper, we focus on the magnetic resonance（MR） images denoising for brain modeling reconstruction, and exploit a practical solution. We attempt to remove the noise existing in the MR imaging signal and preserve the image characteristics. A wavelet-based adaptive curve shrinkage function is presented in spherical coordinates system. The comparative experiments show that the denoising method can preserve better image details and enhance the coefficients of contours. Using these denoised images, the brain 3D visualization is given through surface triangle mesh model, which demonstrates the effectiveness of the proposed method.     

基于Lodrigues Matrix空间后方交会的三维测量方法研究

相机的标定包括相机的外参数和内参数,通过一定数量的控制点,标定出相机内外参数的过程又称空间后方交会.通过简单易理解的方法推导了共线方程,并引入罗德里格矩阵(Lodrigues Matrix)为旋转阵;通过尼康D70s相机、十字靶标、标尺、摩托车车架以及三点编码标记点为实验条件,以理想相机为前提运用解析法详细解算了相机外...     

虚拟仪器与电容实现水膜的自动测量与控制

为了有效地在线测量水膜,本文采用低成本的非接触式、高精度电容测微仪作为水膜厚度的传感器件,采用虚拟仪器进行测量状态的分析,并根据测量结果给出控制信号。电容测微仪将水膜厚度变化信息转换为-10～ 。10V的电压变化,通过A／D采集卡(如ZTIC8310,ZTIC6319等)进入计算机系统,虚拟仪器将实时采集的水膜电压信息转换为水膜的绝对厚度值,并实时显示和保存,以供更深一步的分析。本测控系统准确地测出运动水膜的厚度信息,精度为0．01μ,解决了水膜测量的难题。采用高精度电容测微仪及虚拟仪器进行测量,方法成本低,使用方便,容易扩展到其他测控领域。