We propose a simple and effective method for detecting view- and scale-independent ridge-valley lines defined via first- and secondorder Curvature derivatives on shapes approximated by dense triangle meshes.
标签： scale-independent ridge-valley and effective
上传时间： 2014-01-08
上传用户：sammi
％ COMPDIR Computes a search direction in a subspace defined by Z. ％ Helper function for NLCONST. ％ Returns Newton direction if possible. ％ Returns random direction if gradient is small. ％ Otherwise, returns steepest descent direction. ％ If the steepest descent direction is small it computes a negative ％ Curvature direction based on the most negative eigenvalue. ％ For singular matrices, returns steepest descent even if small.
标签： Z. direction Computes function
上传时间： 2014-01-24
上传用户：Thuan
图像处理的关于Snakes : Active Contour Models算法和水平集以及GVF的几篇文章，文章列表为： [1]Snakes Active Contour Models.pdf [2]Multiscale Active Contours.pdf [3]Snakes, shapes, and gradient vector flow.pdf [4]Motion of level sets by mean Curvature I.pdf [5]Spectral Stability of Local Deformations Spectral Stability of Local Deformations.pdf [6]An active contour model for object tracking using the previous contour.pdf [7]Volumetric Segmentation of Brain Images Using Parallel Genetic AlgorithmsI.pdf [8]Segmentation in echocardiographic sequences using shape-based snake model.pdf [9]Active Contours Without Edges.pdf 学习图像处理的人必看的几篇文章
标签： Contour Snakes Active Models
上传时间： 2014-01-15
上传用户：wqxstar
我用matlab写的一个corner detector, 效果比现在流行的harris，susan，CSS等效果要好。 Algorithm is derived from: X.C. He and N.H.C. Yung, Curvature Scale Space Corner Detector with Adaptive Threshold and Dynamic Region of Support , Proceedings of the 17th International Conference on Pattern Recognition, 2:791-794, August 2004. Improved algorithm has been included in A Corner Detector based on Global and Local Curvature Properties and submitted to Optical Engineering.
标签： detector matlab corner harris
上传时间： 2013-12-30
上传用户：569342831
1-1单透镜这个例子是学习如何在ZEMAX里键入资料，包括设置系统孔径（System Aperture）、透镜单位（Lens Units）、以及波长范围（Wavelength Range），并且进行优化。你也将使用到光线扇形图（Ray Fan Plots）、弥散斑（Spot Diagrams）以及其它的分析工具来评估系统性能。这例子是一个焦距100mm、F/4的单透镜镜头，材料为BK7，并且使用轴上（On-Axis）的可见光进行分析。首先在运行系统中开启ZEMAX，默认的编辑视窗为透镜资料编辑器（Lens Data Editor，LDE），在LDE可键入大多数的透镜参数，这些设置的参数包括：·表面类型（Surf:Type）如标准球面、非球面、衍射光栅..等·曲率半径（Radius of Curvature）·表面厚度（Thickness）：与下一个表面之间的距离·材料类型（Glass）如玻璃、空气、塑胶.…等：与下一个表面之间的材料
标签： zemax
上传时间： 2022-07-27
上传用户：
