相似材料模型变形测量中的数字近景摄影测量监测技术

Monitoring technique for deformation measurement of similar material model with digital close-range photogrammetry

利用高分辨率数字相机获取模型不同时刻的数字立体影像像对,通过模型上布设的像控点和测点,利用直接线性变换提供的概略初值,由理论严密的自检校光束法平差完成高精度的平差计算及相似材料模型的变形测量.试验表明:该方法可以克服传统模型测量方法的缺点,具有测量精度高、信息容量大、方便易行等优点,可以实现实时观测和以影像方式记录模型破坏形态.

Digital stereo image pairs of similar material model were captured with high resolution digital CCD camera. Approximate initial values were provided with direct linear transformation （DLT） method using image control points and survey points distributed on similar material model. Then completed high accuracy computing using these points through the method of self-calibration with bundle adjustment, and deformation measurement of similar material model. Tests demonstrate that this method can cope with some disadvantages of traditional model deformation method and has some unique advantages such as high accuracy, large quantities of information, feasible operating, real monitoring, recording destruction morphology with image.