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Tues-A17_01-Beatty-Gridding
In this session, I will focus on the gridding method for fast image reconstruction from non-
Cartesian data [1-5]. While gridding is not the only game in town, it is the reconstruction of
choice when reconstruction time is an issue. Other reconstruction techniques include rBURS
[6] and non-Cartesian iterative methods [7,8]. Non-Cartesian iterative methods generally use
gridding and inverse gridding as their core operation, so even when gridding is not the right
solution for an application, an understanding of gridding can be useful.
I will cover the main steps of the gridding algorithm and then discuss some implementation tips
that can signicantly reduce the computation time. Finally, I will present some illustrations and
viewpoints that I have found to aid in an intuitive understanding of the gridding method, which
can be helpful when designing the density compensation function and judging the appropriateness
of gridding as a solution for a particular application.
- 2012-05-27 18:19:18下载
- 积分：1
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matlab_FEM_dismesh
DistMesh giving a singular FEM matrix?(Hi
Anyone here with some experience of using DistMesh in finite element code? I m solving the scalar Helmoltz equation in an annular region in 2D:
rho_1 < rho < rho_2
where rho_1 is the radius of a Perfect Electric Conducting cylinder and rho_2 is where the mesh is truncated using an Absorbing Boundary condition.
Now, I ve written code to mesh the region myself (by dividing the region into annular rings and picking a fixed number of points on each ring) and I ve written another program which uses DistMesh to mesh the region. I get a nice solution using my own meshing code but the FEM matrix becomes singular when I use DistMesh. This is the DistMesh Code I used:
Circle with hole
rABC=1.5
rCyl=0.5
fdstring=sprintf( ddiff(dcircle(p,0,0, f),dcircle(p,0,0, f)) ,rABC,rCyl)
fd=inline(fdstring, p )
box=[-2,-2 2,2]
[p,N]=distmesh2d(fd,@huniform,0.04,box,[])
I tried changing box and the 0.04 value (initial edge length). But every time, the matrix becomes sin)
- 2010-06-05 09:17:55下载
- 积分：1
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41695027snakedemo
说明： 用MATLAB编写的meanshift分割图像的方法，供大家参考!(meanshift)
- 2010-04-02 11:53:41下载
- 积分：1
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Record
Matlab录音程序，可以供学习参考用，欢迎改进。(Matlab recording program, you can reference for the study, welcomed the improvement.)
- 2010-05-06 09:50:42下载
- 积分：1
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Filter-implementation-in-matlab
its a matlab discription of varius digitl filers both in special and frequency domain. very useful for beginners.
- 2013-10-18 13:29:52下载
- 积分：1
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fastICA
基于负熵最大化的fastICA，matlab程序。程序中的公式在所附带的pdf文件中都高亮标明(Based on negative entropy maximization fastICA, matlab program. The formula in the program attached pdf file are highlighted marked)
- 2013-10-29 19:24:49下载
- 积分：1
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my_project
接收端对有干扰污染后的信号进行对应解码，并计算误码率；
将输出仍然排列为n列的矩阵，计算监督矩阵H，用编码矩阵和监督矩阵相乘判断是否有误码，并根据错误图案纠正误码(The receiving end of pollution have interference signals corresponding to decoding, and calculate the bit error rate the output is still ranked as the n column matrix, computing the supervision matrix H, with matrix encoding and monitoring to determine whether matrices have error, and in accordance with error patterns to correct error)
- 2009-02-27 19:27:23下载
- 积分：1
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PlateRecognition
车牌自动识别，采用形态学方法，附带有测试图，适应性较强(Automatic license plate recognition, using morphology, with a test pattern, adaptability)
- 2010-10-31 09:48:55下载
- 积分：1
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432
matlab gui实例，创建一个窗口，绘制三维图像，创建按钮，修改颜色(matlab gui example, create a window, and modify the menu bar buttons)
- 2010-12-07 10:37:22下载
- 积分：1
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mfcc
mfcc code for feaature extraction
- 2012-03-30 15:46:57下载
- 积分：1
