基于三维梯度幅值的CT图像体绘制
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摘要
为了在CT影像体绘制过程中保持感兴趣区域三维空间的局部形状特征,提出了一种基于三维梯度幅值的传递函数设计方法:利用边缘提取和去噪分割等处理得到感兴趣区域的完整边缘结构,计算体数据中图像序列像素点到边缘处的距离,以此距离值纳入Kindlmann的传递函数生成框架,得到新的传递。与Kindlmann提出的半自动传递函数生成算法进行体绘制对比实验,结果表明:原始方法对图像噪声敏感等问题得到明显改善,能有效突显出感兴趣的区域。
In order to maintain the partial shape characteristics of the three-dimensional space of interest in the process of CT images volume rendering, a transfer function method based on the three dimensional gradient amplitude is proposed. Edge detection and denoising segmentation are employed to obtain the complete edge structure of the interested area. The distance between the image sequences pixels and the edge in the body data is calculated, so that the framework can be formed with the distance data brought into the Kindlmann transfer function. Therefore, a new transfer function is achieved. The comparison experiment with semi-automatic transfer function proposed by Kindlmann shows that problems like image noise sensitivity can be obviously solved by original methods, which can also highlight the interested parts.
In order to maintain the partial shape characteristics of the three-dimensional space of interest in the process of CT images volume rendering, a transfer function method based on the three dimensional gradient amplitude is proposed. Edge detection and denoising segmentation are employed to obtain the complete edge structure of the interested area. The distance between the image sequences pixels and the edge in the body data is calculated, so that the framework can be formed with the distance data brought into the Kindlmann transfer function. Therefore, a new transfer function is achieved. The comparison experiment with semi-automatic transfer function proposed by Kindlmann shows that problems like image noise sensitivity can be obviously solved by original methods, which can also highlight the interested parts.
引文
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[3]Kniss J,Kindlmann G,Hansen C.Multidimensional transfer functions for interactive volume rendering[J].Visualization Handbook(S1077-2626),2005,8(3):189-209.
[4]聂俊岚,刘益萌,张继凯,等.基于平行坐标主维度的多变量传递函数设计方法[J].计算机辅助设计与图形学学报,2015(12):2340-2349.Nie Junlan,Liu Yimeng,Zhang Jikai,et al.Design method of multivariable transfer function based on Principal dimensions of parallel coordinates[J].Journal of computer aided design and graphics,2015(12):2340-2349.
[5]梁荣华,李伟明,王子仁,等.特征抽象的直接体绘制方法[J].计算机辅助设计与图形学学报,2014,26(3):339-347.Liang Ronghua,Li Weiming,Wang Ziren,et al.Direct volume rendering method based on feature abstraction[J].Journal of computer aided design and graphics,2014,26(3):339-347.
[6]孙思远,陈莉,廖鸿森.基于二维直方图图像智能分割的体绘制传递函数设计[J].计算机辅助设计与图形学学报,2014,26(10):1583-1592.Sun Siyuan,Chen Li,Liao Hongsen.Design of transfer function for volume rendering based on intelligent segmentation of two-dimensional histogram and[J].Journal of computer aided design and graphics,2014,26(10):1583-1592.
[7]蔡海萍,王博亮,鞠颖.基于光学相干层析图像的眼底黄斑部三维重建[J].厦门大学学报(自然科学版),2007,46(3):342-346.Cai Haiping,Wang Boliang,Ju Ying.Journal of Xiamen University[J].three-dimensional reconstruction of macular optical coherence tomography based on Image:(Natural Science Edition),2007,46(3):342-346.
[8]洪佳旭,刘笑宇,樊瑜波,等.基于光学相干衍射技术的活体人眼前节图像三维重建研究[C]//International Conference on Cellular,molecular Biology,Biophysics and Bioengineering,2010,14(5):256-263.Hong Jiaxu,Liu Xiaoyu,Fan Yubo,et al.Study on three dimensional reconstruction of human anterior segment images based on optical coherence diffraction[C]//International Conference on Cellular.molecular Biology,Biophysics and Bioengineering,2010,14(5):256-263.
[9]顾翀,杨新,姚莉萍,等.基于可见性直方图的传递函数在心脏三维显示中的应用[J].CT理论与应用研究,2013,22(1):61-73.Gu Chong,Yang Xin,Yao Li-ping.Visibility histogram based transfer function for 3D visualization of heart[J].CT Theory and Applications,2013,22(1):61-73.
[10]Kindlmann G,Whitaker R,Tasdizen T,et al.Curvature-based transfer functions for direct volume rendering:Methods and applications[C]//Visualization,2003.VIS 2003.IEEE.IEEE,2003:S513-520.
[11]李昕,陈伟锋,吴向阳,等.并行精确排序的快速投影四面体体绘制[J].计算机辅助设计与图形学学报,2013,25(8):1153-1158.Li Xin,Chen Weifeng,Wu Xiangyang,et al.Fast projection tetrahedral volume rendering based on parallel exact sorting[J].Journal of computer aided design and graphics,2013,25(8):1153-1158.
[12]严鑫,董俊卿,李青会,等.基于OCT技术对古瓷釉气泡特征的初步研究[J].光谱学与光谱分析,2015,35(8):2275-2280.Yan Xin,Dong Junqing,Li Qinghui,et al.Analysis of OCT technology on the ancient glazes bubble characteristics of[J].Spectroscopy and Spectral Analysis,2015,35(8):2275-2280.