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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2015 Vol.16 No.1 P.79-84
Design and calibration of a new high-definition three-dimensional laparoscopic system
Abstract: We present a high-definition (HD) 3D laparoscopic system including a dual channel optical system, two cameras, a camera control unit (CCU), and an HD 3D monitor. This laparoscopic system is capable of outputting dual high-definition videos and providing vivid 3D images. A modified pinhole camera model is used for camera calibration and a new method of depth measurement to improve precision. The average error of depth measurement measured by experiment (about 1.13 mm) was small in proportion to the large range in distance of the system (10–150 mm). The new method is applicable to any calibrated binocular vision system.
Key words: Dual optical channels, Three dimensional, Camera calibration, Pinhole model, Depth measurement, Laparoscopic system
创新：采用双光学通道，使用中继透镜延长图像光学传输距离，在中继透镜末端用两个相机接收内窥图像，简化腹腔镜结构，并保证了成像质量。
方法：首先，根据图像传感器参数和视场需求大小确定内窥镜光学系统的有效焦距，在此基础上设计包括中继透镜在内的双通道光学镜头（图1）。其次，设计CCU用于采集和处理双通道高清视频图像，并通过HDMI输出将它们同时显示在3D显示器上，由此构建了高清三维腹腔镜系统（图4）。最后，针对双目内窥镜系统采用传统针孔模型计算距离存在较大误差的问题，通过理论分析提出一种新的距离计算方法，并在0-150 mm范围内的距离测量实验中验证该算法的有效性（图3）。
结论：新型三维腹腔镜在保证成像质量的基础上简化了系统结构；采用提出的双目系统距离计算方法可以有效提高双目内窥系统的测距精度。
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DOI:
10.1631/FITEE.1400149
CLC number:
TP391; R608
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On-line Access:
2014-12-23
Received:
2014-04-22
Revision Accepted:
2014-09-25
Crosschecked:
2014-12-08