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分水岭分割方法,是一种基于拓扑理论的数学形态学的分割方法,其基本思想是把图像看作是测地学上的拓扑地貌,图像中每一点像素的灰度值表示该点的海拔高度,每一个局部极小值及其影响区域称为集水盆,而集水盆的边界则形成分水岭。分水岭的概念和形成可以通过模拟浸入过程来说明。在每一个局部极小值表面,刺穿一个小孔,然后把整个模型慢慢浸入水中,随着浸入的加深,每一个局部极小值的影响域慢慢向外扩展,在两个集水盆汇合处构筑大坝,即形成分水岭。
分水岭的计算过程是一个迭代标注过程。分水岭比较经典的计算方法是L. Vincent提出的。在该算法中,分水岭计算分两个步骤,一个是排序过程,一个是淹没过程。首先对每个像素的灰度级进行从低到高排序,然后在从低到高实现淹没过程中,对每一个局部极小值在h阶高度的影响域采用先进先出(FIFO)结构进行判断及标注。
分水岭变换得到的是输入图像的集水盆图像,集水盆之间的边界点,即为分水岭。显然,分水岭表示的是输入图像极大值点。因此,为得到图像的边缘信息,通常把梯度图像作为输入图像,即
g(x,y)=grad(f(x,y))={[f(x,y)-f(x-1,y)]2[f(x,y)-f(x,y-1)]2}0.5
式中,f(x,y)表示原始图像,grad{.}表示梯度运算。
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"分水岭"的最佳翻译为"watershed",相关的英文翻译自动加入检索 HWST stands for "Hierarchical Watershed Transformation" which is an image segmentation technique. The HWST library was designed for a comfortable use as a JAI operator (Java Advanced Imaging). http://sourceforge.net/projects/hwst/ 这个程序是使用分水岭检测法进行图像分割的代码 A demo for image segmentation using iterative watersheding plus ridge detection. http://www.matlab-download.cn/Code/watersheding.html Download installer - 2.7 Mb
Introduction
In 1997, the computer gaming company id Software released a watershed first-person shooter game called QUAKE II, http://www.codeproject.com/KB/mcpp/quake2.aspx pp 501-521, 1993. A paper entitled "Optimal Use of the SCE-UA Global Optimization Method for Calibrating Watershed Models", by Q. Duan, S. Sorooshian, & V.K. Gupta, Journal of Hydrology, Vol.158, 265-284, 1994, http://www.mathworks.com/matlabcentral/fileexchange/7671 SHOWREGIONS(L,N) displays the regions of the label matrix L corresponding to the indices listed in the vector N. Display selected regions of a label matrix. GUI, Display, Annotation. bwlabel, watershed, label matrix http://www.mathworks.com/matlabcentral/fileexchange/2788 SegmentIt: Watershed Based Image Segmentation Tool. This interactive segmentation tool allows to switch back and forth between the watershed approaches (watershedSegmentIt: Watershed Based Image Segmentation Tool. http://sourceforge.net/projects/watershed/ enhancement and intensity segmentation
* Analyze shape of touching objects from topographic data using watershed segmentation and morphological operations
* Isolate cancer cell using edge enhancement and http://www.mathworks.com/matlabcentral/fileexchange/3012 Download library (including OpenCV DLL's) - 1.6 MB
Download library source project - 72.48 KB
Download sample executables - Camera Calibration, Watershed Trafo, Pyramids, Hough Trafo, Histogram and much more. http://www.codeproject.com/KB/cs/Intel_OpenCV.aspx I have used R in this fashion for doing wavelet analysis for price analytics, watershed modeling for acid mine drainage, http://www.codeproject.com/KB/cs/RtoCSharp.aspx Download sample app - 81.5 KB Download GIS sample data - 85.8 KB Introduction A Geographic Information System is a from simple purposes like GIS data exploration to sophisticated purposes like watershed mapping. http://www.codeproject.com/KB/cs/buildgisapp.aspx Modflow and Sutra. Uses GIS data of DEMs, geologic maps, and maps of river, watershed, recharge, and aquifer parameters. http://sourceforge.net/projects/geosolid3d/ RGB = LABEL2RGB3D(L) converts a 3D label matrix L, such as returned by WATERSHED, into a color RGB image.
RGB = LABEL2RGB3D(L, MAP) defines the colormap to be used in the RGB image. http://www.mathworks.com/matlabcentral/fileexchange/8355 with developing a MapWindow GIS version of the N-SPECT watershed model which currently is implemented as an ...the tool operates most accurately in medium-to-large watersheds having moderate topographic relief." http://www.codeplex.com/nspect is a collection of program modules to support the analysis and modeling of rainfall-runoff dynamics of watersheds. http://sourceforge.net/projects/hamtoolbox/ Project DescriptionMOHID Water Modelling System is a set of state-of-the-art numerical models to simulate the water cycle in an integrated approach (SurfaceSurface Water Bodies, Watersheds and Groundwater). http://www.codeplex.com/mohid Divide And Do is a hierarchical personal TO-DO list manager. It's goal is to boost productivity by allowing the addition of sub-tasks to any task, as well as categorizing tasks, http://sourceforge.net/projects/dad/ I am attempting to divide by zero in this project without causing an unhandled exception.I am attempting to divide by zero in this project without causing an unhandled exception. http://sourceforge.net/projects/dividebyzero/ Perl scripts for the usage of the online game Divide and Conquer
http://www.the-game.ruPerl scripts for the usage of the online game Divide and Conquer
http://www.the-game.ru http://sourceforge.net/projects/dnc/ For example, if we want to burn files into CDR, we may divide files into groups less than 670 MB.
Each group can be put into a certain folder. http://www.codeproject.com/KB/files/Divide_Files_in_Groups.aspx Download demo project - 902 Kb
Download source - 19 Kb
SoftechSoftware homepageSoftechSoftware Email, etc) // Return value:
// Class version. Divide by 10 to get actual version. http://www.codeproject.com/KB/buttons/cbuttonst.aspx |