Objective To discuss the measurement of bone tumor volume on the basis of three dimensional images segmentation technology. Methods Twenty patients with lacunar bone tumor from Tianjin Hospital and Tongji Hospital wer...Objective To discuss the measurement of bone tumor volume on the basis of three dimensional images segmentation technology. Methods Twenty patients with lacunar bone tumor from Tianjin Hospital and Tongji Hospital were included in the展开更多
A digital camera measuring system has been used successfully to measure the space fluctuation behaviors of Induced Dielectric Barrier Discharge (IDBD) plasma at atmospheric pres- sure. The experimental results showed ...A digital camera measuring system has been used successfully to measure the space fluctuation behaviors of Induced Dielectric Barrier Discharge (IDBD) plasma at atmospheric pres- sure. The experimental results showed that: (1) The uniformity of electron temperature in space depends on discharge condition and structure of web electrode. For a certain web electrode the higher the discharge voltage is, the more uniform distribution of electron temperature in space will be. For a certain discharge the finer and denser the holes on web electrode are, the more uniform distribution of electron temperature in space will be (2). Digital camera is an available equipment to measure some behaviors of the plasma working at atmospheric pressure.展开更多
Three dimensional-digital image correlation （3D-DIC） is a widely used optical metrology in the experimental mechanics community because of its reliability, practicality, and flexibility. Although the precision of di...Three dimensional-digital image correlation （3D-DIC） is a widely used optical metrology in the experimental mechanics community because of its reliability, practicality, and flexibility. Although the precision of digital image correlation （DIC） has been thoroughly studied theoretically and numerically, verification experiments have seldom been performed, especially fbr complex surfaces with a small field of view （FOV）. In this work, the shape of a 1-yuan coin was measured using 3D-DIC; the shape was complex due to the presence of many fine details, and the FOV was relatively small because the coin diameter was only 25 mm. During the experiment, a novel strategy for speckle production was developed： white paint was simply sprayed onto the surface. Black paint was not used; instead, taking advantage of the reflective nature of the coin surface, polarized light and a Polaroid filter were introduced, and the polarization direction was carefully adjusted, ensuring that the spray pattern was extremely thin and that high-quality speckle images with significant contrast were captured. The three-dimensional coin shape was also successfully determined for comparison using a stylus profiler. The results demonstrate that 3D-DIC provides high precision in shape measurement even for complex surfaces with small FOV. The precision of 3D-DIC can reach 1/7000 of the field of view, corresponding to about 6 ~tm in this experiment.展开更多
双平面镜辅助多视角数字图像相关方法(multi-view digital image correlation,MV-DIC)是DIC技术用于全景或双表面形貌和变形测量的新分支。传统的MV-DIC需要两套或多套同步的双目3D-DIC系统,而双平面镜辅助MV-DIC仅需要一套常规3D-DIC...双平面镜辅助多视角数字图像相关方法(multi-view digital image correlation,MV-DIC)是DIC技术用于全景或双表面形貌和变形测量的新分支。传统的MV-DIC需要两套或多套同步的双目3D-DIC系统,而双平面镜辅助MV-DIC仅需要一套常规3D-DIC系统和两个平面反射镜,其系统成本低和易于实现等优点使其在常规尺寸试样的全景/双表面变形测量任务中可完全替代前者。本文介绍了作者近期在双平面镜辅助MV-DIC研究中取得的新进展,包括两种新型的双平面镜辅助MV-DIC系统和一种基于荧光散斑的平面镜反射变换标定方法。最后介绍了双平面镜辅助MV-DIC在含缺陷蜂窝合金板面内压缩、手机跌落以及管道高速振动双平面/全景变形测量中的应用。展开更多
文摘Objective To discuss the measurement of bone tumor volume on the basis of three dimensional images segmentation technology. Methods Twenty patients with lacunar bone tumor from Tianjin Hospital and Tongji Hospital were included in the
基金This work was supported by National Natural Science Foundation of China No.19775010.
文摘A digital camera measuring system has been used successfully to measure the space fluctuation behaviors of Induced Dielectric Barrier Discharge (IDBD) plasma at atmospheric pres- sure. The experimental results showed that: (1) The uniformity of electron temperature in space depends on discharge condition and structure of web electrode. For a certain web electrode the higher the discharge voltage is, the more uniform distribution of electron temperature in space will be. For a certain discharge the finer and denser the holes on web electrode are, the more uniform distribution of electron temperature in space will be (2). Digital camera is an available equipment to measure some behaviors of the plasma working at atmospheric pressure.
基金supported by the National Natural Science Foundation of China(Grant Nos.11332010,51271174,11372300,11127201,11472266&11428206)
文摘Three dimensional-digital image correlation （3D-DIC） is a widely used optical metrology in the experimental mechanics community because of its reliability, practicality, and flexibility. Although the precision of digital image correlation （DIC） has been thoroughly studied theoretically and numerically, verification experiments have seldom been performed, especially fbr complex surfaces with a small field of view （FOV）. In this work, the shape of a 1-yuan coin was measured using 3D-DIC; the shape was complex due to the presence of many fine details, and the FOV was relatively small because the coin diameter was only 25 mm. During the experiment, a novel strategy for speckle production was developed： white paint was simply sprayed onto the surface. Black paint was not used; instead, taking advantage of the reflective nature of the coin surface, polarized light and a Polaroid filter were introduced, and the polarization direction was carefully adjusted, ensuring that the spray pattern was extremely thin and that high-quality speckle images with significant contrast were captured. The three-dimensional coin shape was also successfully determined for comparison using a stylus profiler. The results demonstrate that 3D-DIC provides high precision in shape measurement even for complex surfaces with small FOV. The precision of 3D-DIC can reach 1/7000 of the field of view, corresponding to about 6 ~tm in this experiment.
文摘双平面镜辅助多视角数字图像相关方法(multi-view digital image correlation,MV-DIC)是DIC技术用于全景或双表面形貌和变形测量的新分支。传统的MV-DIC需要两套或多套同步的双目3D-DIC系统,而双平面镜辅助MV-DIC仅需要一套常规3D-DIC系统和两个平面反射镜,其系统成本低和易于实现等优点使其在常规尺寸试样的全景/双表面变形测量任务中可完全替代前者。本文介绍了作者近期在双平面镜辅助MV-DIC研究中取得的新进展,包括两种新型的双平面镜辅助MV-DIC系统和一种基于荧光散斑的平面镜反射变换标定方法。最后介绍了双平面镜辅助MV-DIC在含缺陷蜂窝合金板面内压缩、手机跌落以及管道高速振动双平面/全景变形测量中的应用。
