Question

急求如何用MATLab实现EM算法

现有一个200行，每行3个实数的一个数据，用它作为例子怎么才能通过EM算法完成？语言是MATLAB，数据是一个data.txt的文件

Answer 1

最大期望算法（Expectation Maximization Algorithm，又译期望最大化算法），是一种迭代算法，用于含有隐变量（hidden variable）的概率参数模型的最大似然估计或极大后验概率估计。
实现代码如下：
02 Jul 2015 hui cheng
06 May 2015 Mei Dong
very good job！

12 Nov 2014 Jobaer
please, sir , send me a source code on image segmentation. I want to segement weeds from soil.My email address is jobaer_ahmed1990@yahoo.com .

18 Jan 2014 HuangJunFeng HuangJunFeng
16 Dec 2013 widdy
19 Feb 2013 Tong Chu
01 Jan 2013 manas nag
sir
after executing this it is declaring that k is undefined

04 Dec 2012 Jason Rebello
Some people want to know how to view the segmented image. For example suppose you have two classes ie k=2; us the following code to view it
[row col] = size(ima);
final_img = zeros(row,col);
for i=1:row
for j=1:col
if mask(i,j)==1
final_img(i,j)=1;
else
final_img(i,j)=255;
end
end
end
imshow(final_img/255);
This is a naive way of viewing it .. you may have to change somethings if k>2. Anywayz hope it helps. The mask basically stores the segmented image.

16 Nov 2011 surya
great job.i am using the same algorithm in my project for x-ray images.can u please tell how to view the segmented image

Comment only

18 Feb 2010 prashanth
Sir, I am starting my project on the same subject. i was unable to find the algorithm psuedocode for em algorithm. kindly send me one at rprashanth31@gmail.com. Also can u just tell me the explanation for the source code..

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21 Dec 2009 maria
Hi, could you please explain how I can use "mask" to see result of segmentation??

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17 Mar 2009 Patrick
Greetings Prof., Very nice .. could you please let me know what exactly does the mask variable store ? As what i see it classifies each pixel that falls within each class . Am i correct in that assumption?
Thanks

24 May 2008 darko brajicic
great job!

27 Apr 2008 Bilo Bilo
Thanks

15 Aug 2007 smiled fisher
06 Nov 2006 Karthik Raja T
HI, Greetings,can it for my color image segmentation ?

04 Sep 2006 Mikel Rodriguez
12 Jul 2006 carlos mas
03 May 2006 Mohamed Sami
look when u make a code u must show us the output to see it then u read ur code .. try to explain that with output we can see bye

Answer 2

http://wenku.baidu.com/link?url=w2IBgNkrsMdXwfLZpE1EWiwk3Hn2Js1NU4qUTJzBS5nel1C5xKsHGSBFUqhBCEiE4EwnuhN0Ktofwt7QgpgCM7rD4El0YwmTWSMb6JC3eWW
网上有对应的代码，可以自己查看！

Answer 3

EM算法介绍及Matlab演示代码(一维和多维高斯混合模型学习算法)

网页链接