Chan Manhong, Lin Wumei, Zhou Changhe, Qu Jianan Y
Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Appl Opt. 2003 Apr 1;42(10):1888-98. doi: 10.1364/ao.42.001888.
A miniaturized three-dimensional endoscopic imaging system is presented. The system consists of two imaging in channels that can be used to obtain an image from an object of interest and to project as tructured light onto the imaged object to measure the surface topology. The structured light was generated with a collimated monochromatic light source and a holographic binary phase grating. The imaging and projection channels were calibrated by use of a modified pinhole camera. The surface profile was extracted by use of triangulation between the projected feature points and the two channel ofthe endoscope. The imaging system was evaluated in three-dimensional measurements of several objects with known geometries. The results show that surface profiles of the objects with different surfaces and dimensions can be obtained at high accuracy. The in vivo measurements at tissue sites of human skin and an oral cavity demonstrated the potential of the technique for clinical applications.
介绍了一种小型化三维内窥镜成像系统。该系统由两个成像通道组成，可用于从感兴趣的物体获取图像，并将结构光投射到成像物体上以测量表面拓扑结构。结构光是由准直单色光源和全息二元相位光栅产生的。成像和投影通道通过使用改进的针孔相机进行校准。通过投影特征点与内窥镜的两个通道之间的三角测量来提取表面轮廓。该成像系统在对几个具有已知几何形状的物体进行三维测量中得到了评估。结果表明，可以高精度地获得具有不同表面和尺寸的物体的表面轮廓。在人体皮肤和口腔的组织部位进行的体内测量证明了该技术在临床应用中的潜力。
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