【作者】 伍新中；

【导师】 张树生；

【作者基本信息】 西北工业大学 ， 生物医学工程， 2007， 硕士

【摘要】 数字化技术是当今世界研究最热门、应用领域最广的技术之一。得益于“数字化人”的研究进展，人体器官的数字化三维模型的获取已经变的容易。但对这些三维模型增加彩色纹理以体现真实感的研究并不多见。另外，在全国各学校、医院存有大量的医学教具模型，将这类模型数字化并增加纹理对多媒体教学、远程教育以及搭建虚拟手术平台均有重要意义。因此，本文对器官模型的数字化和纹理映射技术展开研究，并满足真实感渲染的需要。 本文的主要研究内容和研究成果有： 1．基于MITK的QEM三角网格简化算法集成。本文对MITK进行了一定深度的学术研究，解决了不同数据结构之间数据交换的难题，成功将MITK的mitkQEMSimplification模块集成到本系统中，完成了器官模型三角网格的简化。 2．基于轮廓线与已有纹理的纹理配准技术。本文利用器官模型的轮廓线进行纹理配准。提出利用已配准纹理进行配准的方式，弥补了单纯利用轮廓线配准信息不足的问题。对轮廓线的提取进行了研究，利用Laplacian算子和Sobel算子实现了轮廓线特征与纹理特征的提取。实现了基于OpenGL可视化平台下的人机交互配准，对纹理自动配准技术进行了深入研究。 3．基于分块映射的纹理拼接技术。本文提出一种利用三角面片与视线垂直的判定方法选用纹理进行拼接。利用这一准则对三维模型进行自然分块，而不用考虑具体的分块位置。可对任意角度的纹理进行配准与拼接，整个纹理拼接操作过程简单友好“所见即所得”。并对纹理接缝进行了融合处理。本文提出并实现了一种将多块纹理拼接成一块完整纹理的正方形缩进递归算法，输出了拼接纹理并自动生成拼接后的纹理坐标。 4．基于OpenGL的生物器官模型可视化平台开发。利用面向对象的编程思想，在Visual Studio 2003.net平台下开发了一个基于OpenGL的生物器官模型可视化平台BOVS。该平台除单纯的可视化功能外，还集成了网格简化，纹理配准，纹理拼接，纹理输出等功能。本文以采集的心脏、肝脏和胃模型为实例，进行了多项相关实验，并给出了实验结果。对本文中的相关技术和算法进行了有力的验证。更多还原

【Abstract】 Digital technology is one of the active topics in current research and is widely used in many fields. Benefited from the research progress of "Digital Human", the digital 3D models of human organs become easier to be obtained. But research on true color texture mapping on these kinds of 3D models was seldom found in papers. Otherwise, there are a mass of medical teaching models in most schools and hospitals of our country. it’s very meaningful to digital these models and put textures on them, which will benefit to multi-media teaching, distance education and setting up virtual surgery platform. For above reasones, this thesis mainly research on digital and texture mapping technology of organ models, meet with the demands of the third dimension rendering.The main research contents and achievements are articulated as follows:1. The integration of QEM tri-mesh simplification algorithm of MITK. A deep-ranging research was done on MITK. The difficulty of data exchange between different data structures was solved. The module of mitkQEMSimplification algorithm was integrated. The simplification of tri-mesh organ models was accomplished.2. Texture registration technology based on outline and registered texture. The registration by using the outline was studied in this paper. A method of using the registered texture in texture registration was proposed. The information shortage of using simply outline in registration was made up. Research on outline feature extraction was progressed. By introduce the Laplacian and Sobel operators, the outline feature and texture feature extraction was realized. A human computer interactive registration was successful done in a OpenGL based visualization platform. The automatic method of texture registration was studied.3. Texture mosaic technology based on partial texture mapping. A rule to mosaic the texture image was introduced, which can be defined as the line of sight most perpendicular with the tri-mesh is the best suitable texture; it can mosaic and register a texture in any direction. The whole operation is very simply and friendly, "what you see, what you gain"; a square indent recursion algorithm was put forward and realized in this platform; the textures assembly into ONE texture was realized,更多还原