首先用计算机图象处理系统将材料截面图形数字化，并采用链码方法和精确边界寻迹方法确定图形边界。
The boundary of the area of interest is located by using chain code method and precise boundary tracking method with a computer vision system.
三维地形虚拟现实技术是当前计算机图形学、地理信息系统和数字摄影测量技术研究的热点问题。
The study on 3 D Terrain VR is a hot topic in Computer Graphic, Geographic Information System and Digital Photogrammetry.
三维地形虚拟现实技术是当前计算机图形学、地理信息系统和数字摄影测量技术研究的热点问题。
The study on 3 D Terrain VR is a hot topic in Computer Graphic, Geographic Information System and Digital Photogrammetry.
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