在眼科疾病检测中,为了对被检测者进行快速、准确、自动化的瞳孔定位,提出一种改进径向对称变换的瞳孔中心点定位算法。首先利用灰度积分投影法结合最大类间方差法,完成对人眼图像的粗分割,并根据多团块筛选条件提取出只包含瞳孔的感兴...在眼科疾病检测中,为了对被检测者进行快速、准确、自动化的瞳孔定位,提出一种改进径向对称变换的瞳孔中心点定位算法。首先利用灰度积分投影法结合最大类间方差法,完成对人眼图像的粗分割,并根据多团块筛选条件提取出只包含瞳孔的感兴趣区域(Region Of Interest,ROI)。然后对ROI采用最小外接矩形结合灰度级形态学线性滤波方法,完成搜索半径范围的设置。最后,利用改进的径向对称变换算法进行瞳孔中心点定位。实验结果表明:本文算法的定位误差在8 pixel以内,平均定位时间为0.366 s,能够适应人眼图像中噪声干扰、采集不完整等大量非理性状态,满足多种红外眼科疾病检测设备对瞳孔定位算法的要求。展开更多
Investigated in this paper is the generalized nonlinear Schrodinger equation with radial symmetry. With the help of symbolic computation, the one-, two-, and N-soliton solutions are obtained through the bilinear metho...Investigated in this paper is the generalized nonlinear Schrodinger equation with radial symmetry. With the help of symbolic computation, the one-, two-, and N-soliton solutions are obtained through the bilinear method. B^cklund transformation in the bilinear form is presented, through which a new solution is constructed. Graphically, we have found that the solitons are symmetric about x = O, while the soliton pulse width and amplitude will change along with the distance and time during the propagation.展开更多
文摘在眼科疾病检测中,为了对被检测者进行快速、准确、自动化的瞳孔定位,提出一种改进径向对称变换的瞳孔中心点定位算法。首先利用灰度积分投影法结合最大类间方差法,完成对人眼图像的粗分割,并根据多团块筛选条件提取出只包含瞳孔的感兴趣区域(Region Of Interest,ROI)。然后对ROI采用最小外接矩形结合灰度级形态学线性滤波方法,完成搜索半径范围的设置。最后,利用改进的径向对称变换算法进行瞳孔中心点定位。实验结果表明:本文算法的定位误差在8 pixel以内,平均定位时间为0.366 s,能够适应人眼图像中噪声干扰、采集不完整等大量非理性状态,满足多种红外眼科疾病检测设备对瞳孔定位算法的要求。
基金Supported by the National Natural Science Foundation of China under Grant No.60772023the Open Fund (No.BUAASKLSDE-09KF-04)+2 种基金Supported Project (No.SKLSDE-2010ZX-07) of the State Key Laboratory of Software Development Environment,Beijing University of Aeronautics and Astronauticsthe National Basic Research Program of China (973 Program) under Grant No.2005CB321901the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.200800130006,Chinese Ministry of Education
文摘Investigated in this paper is the generalized nonlinear Schrodinger equation with radial symmetry. With the help of symbolic computation, the one-, two-, and N-soliton solutions are obtained through the bilinear method. B^cklund transformation in the bilinear form is presented, through which a new solution is constructed. Graphically, we have found that the solitons are symmetric about x = O, while the soliton pulse width and amplitude will change along with the distance and time during the propagation.
