A full geometric and photometric calibration method for oblique-viewing endoscopes
A full geometric and photometric calibration method for oblique-viewing endoscopes
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DOI：
10.3109/10929081003718758
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发表时间：
2010-01-01
影响因子：
--
通讯作者：
Narasimhan, S. G.
中科院分区：
文献类型：
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作者：
Wu, C.;Jaramaz, B.;Narasimhan, S. G.
在计算机辅助手术中广泛使用了非直视内窥镜（倾斜镜）。倾斜瞄准镜的观察方向可以通过旋转瞄准镜圆柱体来改变;这扩展了视野，但也使几何校准过程更加困难。虽然很少有校准方法尚未开发，校准是关键的增强现实技术的应用，如立体视觉程序涉及倾斜范围。此外，据我们所知，还没有为内窥镜引入光度校准方法，即使这种校准对于基于照明的可视化技术（如阴影恢复形状）很重要。在本文中，我们提出了一个完整的校准过程中，观察内窥镜，估计几何和光度特性。实验结果表明，我们的方法是实用和准确的。
Oblique-viewing endoscopes (oblique scopes) are widely used in computer assisted surgeries. The viewing direction of an oblique scope can be changed by rotating the scope cylinder; this extends the field of view, but also makes the geometric calibration process more difficult. Although few calibration methods have yet been developed, calibration is critical for the application of augmented-reality technologies such as stereo vision to procedures involving oblique scopes. Moreover, to our knowledge, no photometric calibration method has yet been introduced for endoscopes, even though such calibration is important for illumination-based visualization techniques such as shape-from-shading. In this paper, we present a complete calibration process for oblique-viewing endoscopes, estimating both geometric and photometric properties. Experimental results demonstrate that our methods are practical and accurate.