矢量场可视化是科学计算可视化中最具挑战性的研究课题之一 .为了能在二维屏上直观显示三维矢量场 ,将基于纹理的 L IC方法拓展到三维矢量场可视化 ,通过设计稀疏线噪声纹理并配合斜坡卷积核提高Volum e L IC图象质量 ,显著增强空间深度...矢量场可视化是科学计算可视化中最具挑战性的研究课题之一 .为了能在二维屏上直观显示三维矢量场 ,将基于纹理的 L IC方法拓展到三维矢量场可视化 ,通过设计稀疏线噪声纹理并配合斜坡卷积核提高Volum e L IC图象质量 ,显著增强空间深度感 ,并采用光线投射直接体绘制方法生成 Volum e L IC图象 ;另外 ,针对循环动画的突兀现象 ,提出 HRCK(Hanninged Ram p Convolution Kernel)法生成流畅的 Volum e L IC循环动画 ;提出Volum e L IC Probe交互洞察三维矢量场内部信息 .通过实例表明 ,本文所提方法具有良好的可视化效果 ,交互方便 .展开更多
目的探讨并比较PEN了RA MS 60血细胞分析仪、XS800i血细胞分析仪及手工分类对LIC(巨大未成熟细胞)分析的差异性,为制订PENTRAMS60血细胞分析仪复检标准提供依据。方法对PEN了RA MS 60血细胞分析仪检测到有LIC阳性报警的85例新鲜全血样...目的探讨并比较PEN了RA MS 60血细胞分析仪、XS800i血细胞分析仪及手工分类对LIC(巨大未成熟细胞)分析的差异性,为制订PENTRAMS60血细胞分析仪复检标准提供依据。方法对PEN了RA MS 60血细胞分析仪检测到有LIC阳性报警的85例新鲜全血样本和无LIC报警的阴性样本真19例分别制作血涂片,经瑞氏染色后进行显微镜阅片,同时把204例新鲜全血样本用于XS800i血细胞分析仪检测,对三种方法检测的LIC结果进行统计学分析。结果1.MS60与XS800i测定结果相比,出现LIC报警阳性的总符合率为87.3%,其差异无统计学意义(P>0.05);2.MS60、XS800i分別与手工分类相比,总符合率分别为78.4%、73.5%,差异均有统计学意义(P<0.05),敏感度分别为93.6%、91.5%,特异度分别为73.9%、68.9%,假阳性率分別为20.1%、24.5%,假阴性率分别为1,5%、2.0%;3.提高MS 60的LIC报警阈值,即LIC>6%和/或LIC#>0.5x10^9/L时,与手工分类相比,总符合率为92.6%,差异无统计学意义(P>0.05),敏感度为91.5%,特异度为93%,假阳性率为5.4%,假阴性率为2%。结论 MS60血细胞分析仪提示LIC测定结果可信性高,LIC≤6%和/或LIC#≤0.5x10^9/L时可不必手工分类复检。展开更多
Line integral convolution(LIC)is a useful visualization technique for a vector field.However,the output image produced by LIC has many problems in a marine vector field.We focus on the visual quality improvement when ...Line integral convolution(LIC)is a useful visualization technique for a vector field.However,the output image produced by LIC has many problems in a marine vector field.We focus on the visual quality improvement when LIC is applied in the ocean steady and unsteady flow field in the following aspects.When a white noise is used as the input in a steady flow field,interpolation is used to turn the discrete white noise into continuous white noise to solve the problem of discontinuity.The"cross"high-pass filtering is used to enhance the textures of streamlines to be more concentrated and continuity strengthened for each streamline.When a sparse noise is used as the input in a steady flow field,we change the directions of background sparse noise according to the directions of vector field to make the streamlines clearer and brighter.In addition,we provide a random initial phase for every streamline to avoid the pulsation effect during animation.The velocities of vector field are encoded in the speed of the same length streamlines so that the running speed of streamlines can express flow rate.Meanwhile,to solve the problem of obvious boundaries when stitching image,we change the streamline tracking constraints.When a white noise is used as an input in an unsteady flow field,double value scattering is used to enhance the contrast of streamlines;moreover,the"cross"high-pass filtering is also adopt instead of two-dimensional high-pass filtering.Finally,we apply the above methods to a case of the surface wave field in typhoon condition.Our experimental results show that applying the methods can generate high-quality wave images and animations.Therefore,it is helpful to understand and study waves in typhoon condition to avoid the potential harm of the waves to people's lives and property.展开更多
文摘矢量场可视化是科学计算可视化中最具挑战性的研究课题之一 .为了能在二维屏上直观显示三维矢量场 ,将基于纹理的 L IC方法拓展到三维矢量场可视化 ,通过设计稀疏线噪声纹理并配合斜坡卷积核提高Volum e L IC图象质量 ,显著增强空间深度感 ,并采用光线投射直接体绘制方法生成 Volum e L IC图象 ;另外 ,针对循环动画的突兀现象 ,提出 HRCK(Hanninged Ram p Convolution Kernel)法生成流畅的 Volum e L IC循环动画 ;提出Volum e L IC Probe交互洞察三维矢量场内部信息 .通过实例表明 ,本文所提方法具有良好的可视化效果 ,交互方便 .
文摘目的探讨并比较PEN了RA MS 60血细胞分析仪、XS800i血细胞分析仪及手工分类对LIC(巨大未成熟细胞)分析的差异性,为制订PENTRAMS60血细胞分析仪复检标准提供依据。方法对PEN了RA MS 60血细胞分析仪检测到有LIC阳性报警的85例新鲜全血样本和无LIC报警的阴性样本真19例分别制作血涂片,经瑞氏染色后进行显微镜阅片,同时把204例新鲜全血样本用于XS800i血细胞分析仪检测,对三种方法检测的LIC结果进行统计学分析。结果1.MS60与XS800i测定结果相比,出现LIC报警阳性的总符合率为87.3%,其差异无统计学意义(P>0.05);2.MS60、XS800i分別与手工分类相比,总符合率分别为78.4%、73.5%,差异均有统计学意义(P<0.05),敏感度分别为93.6%、91.5%,特异度分别为73.9%、68.9%,假阳性率分別为20.1%、24.5%,假阴性率分别为1,5%、2.0%;3.提高MS 60的LIC报警阈值,即LIC>6%和/或LIC#>0.5x10^9/L时,与手工分类相比,总符合率为92.6%,差异无统计学意义(P>0.05),敏感度为91.5%,特异度为93%,假阳性率为5.4%,假阴性率为2%。结论 MS60血细胞分析仪提示LIC测定结果可信性高,LIC≤6%和/或LIC#≤0.5x10^9/L时可不必手工分类复检。
基金Supported by the National Key Research and Development Program of China(No.2016YFC1402000)
文摘Line integral convolution(LIC)is a useful visualization technique for a vector field.However,the output image produced by LIC has many problems in a marine vector field.We focus on the visual quality improvement when LIC is applied in the ocean steady and unsteady flow field in the following aspects.When a white noise is used as the input in a steady flow field,interpolation is used to turn the discrete white noise into continuous white noise to solve the problem of discontinuity.The"cross"high-pass filtering is used to enhance the textures of streamlines to be more concentrated and continuity strengthened for each streamline.When a sparse noise is used as the input in a steady flow field,we change the directions of background sparse noise according to the directions of vector field to make the streamlines clearer and brighter.In addition,we provide a random initial phase for every streamline to avoid the pulsation effect during animation.The velocities of vector field are encoded in the speed of the same length streamlines so that the running speed of streamlines can express flow rate.Meanwhile,to solve the problem of obvious boundaries when stitching image,we change the streamline tracking constraints.When a white noise is used as an input in an unsteady flow field,double value scattering is used to enhance the contrast of streamlines;moreover,the"cross"high-pass filtering is also adopt instead of two-dimensional high-pass filtering.Finally,we apply the above methods to a case of the surface wave field in typhoon condition.Our experimental results show that applying the methods can generate high-quality wave images and animations.Therefore,it is helpful to understand and study waves in typhoon condition to avoid the potential harm of the waves to people's lives and property.
