Mean Shift Clustering

Cluster data by using the Mean Shift Algorithm

Description

Clusters data using the Mean Shift Algorithm. testMeanShift shows an example in 2-D. Set plotFlag to true to visualize iterations.

• MATLAB release: MATLAB 7 (R14)

[wang]

meaning shift is OK?

[Henrik Skovsgaard]

 

[Punit Rathore]

Can anybody give me the this code for colour image segmentation??

[Peter K]

This is great code! It's very easy to read and taught me a lot about mean shift.

I found that the runtime was decreased on my machine and data by replacing the lines:

sqDistToAll = sum((repmat(myMean,1,numPts) - dataPts).^2);
and
beenVisitedFlag(myMembers) = 1;

with:

sqDistToAll = sum(bsxfun(@minus,myMean,dataPts).^2);
and
beenVisitedFlag(inInds) = 1;

respectively.

Thanks for the code!

[Peter K]

 

[Nam]

Guys, is there any code for high dimensional data? This code doesnt work for D is greater than 2. Thanks.

[Tali]

In order to Bart's code on 1D dim data a small change should be made:

sqDistToAll = sum((repmat(myMean,1,numPts) - dataPts).^2,1);

[Harrison Woods]

Very good code, thank u ,guy!

[Fuat Cogun]

 

[Anton Kylling]

Problem solved :)

[Anton Kylling]

I get an unhandled exception using edison_wrapper. Anyone else experiencing this?

MATLAB Version: 7.7.0.471 (R2008b)
Operating System: Microsoft Windows Vista
Window System: Version 6.0 (Build 6002: Service Pack 2)
Processor ID: x86 Family 6 Model 7 Stepping 6, GenuineIntel
Virtual Machine: Java 1.6.0_04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
Default Encoding: windows-1252

Vista x64 might be the problem, but I have recompiled the wrapper.

Any help is appreciated. Thanks in advance.

[Shai]

Luis,
type
>> doc edison_wrapper
and you'll get a description of the various parameters and default values.

[Luis Mont Blanc]

I see this: http://www.wisdom.weizmann.ac.il/~bagon/matlab.html
But i don't understand how to use it.
How can i use the 4th argument of the function?

Can you please write a sample code of how to use it?

Thank you

[Sebastien PARIS]

Well done!

[Shai]

For image you have
http://www.wisdom.weizmann.ac.il/~bagon/matlab.html

[brais martinez]

good code and working straight away but there is no option to set weights to the clustered points

also a brief help file would be useful (to describe parameters and so on)

[Yun Yongsheng]

I have downloaded this code, and tested in my pc'matlab6.5 R13. But there are still two errors happened. The error is reported as " The Error in ==> C:\MATLAB6p5\work\RectifKitU\MeanShift\MeanShiftCluster.m
On line 99 ==> clusterVotes(numClust,:) = thisClusterVotes; "
??? Subscripted assignment dimension mismatch."

I don't know how to solve this problem for the code. Could any one kind help me?

[Wahyu Caesar]

can I use to vibration data.
please send the answer to my email :
[e-mail]

[Daniel Carlton]

Rob, by padding you mean adding a row containing only zeros ? Indeed using a 1D vector (a grayscale image vectorized) the code crashes as you say.

What does the "bandwitdh" parameter stand for ? Is it the window size ?

Thank you

[Rob Barton]

It is good base code:

However I believe that the author is using something closer to a nadaraya-watson estimator (When he takes the:

Mean = mean(dataPts:,inInds),2);

He states he is using a 'flat' or epanechnikov kernal and the computation is different:

See: Dorin Comaniciu "Mean Shift: A Robust Approach Toward Feature Space Analysis" IEEE Transactions on pattern analysis and machine intelligence, Vol. 24, No. 5, May 2002.

By altering this and making a few other minor edits this is excellent code to start from to customize to the users requirements.

the computation of 'sqDistToAll = sum(...)' makes the assumption that the user passes more than a 1D data... so if you passed just gray levels of an image in a 1D array the code will crash, however if you passed a LUV image, (3 elements per pixel) it would work. alternately you can pad the input data with a redundant row or alter the code to check for a single row input and perform the slightly modified but same computation.

Thanks.

[Tac Charles]

Thank you

[jaya priya]

i want to do it for color image segmentation how to do pls help me

[Kim GH]

It's good but some problem occures when running on the matlab ver 6.5.
To aboide this modify like that
"zeros(1,numPts,'unit8');" -> "zeros(1,numPts);"

[Patson patrick]

I would like to subscribe the algorithm mean shift .
Tank you

[praisan padungweang]

clustering algorithm on images?
You may prepare the data in 1D(gray scale), 3D (RGB or x,y,I;in gray scale) or 5D (x,y,R,G,B) then go with mean shift.

[Ming Liu]

The code is good, while more examples can further improve the quality.

[JW Lee]

Can anyone provide some help for me on how to use this clustering algorithm on images?

[satria gunawan]

i too not undestand to used to image, there are some body help me?

[hosung han]

thanks

[Ning J.]

see D. Comaniciu PH.D Thesis about clustering or applying mean shift to image!

[Hanh Vu]

Hello every body
I have to use the mean-shift algorithm for finding the modes of a
image histogram. is there anyone that have an M-file to do this?
Thanks in advance.

[Abhijeet Jadhav]

How to use it for image?

[orazio gambino]

Hi guys,

I changed the following lines into MeanShiftCluster.m and now it works:

40: beenVisitedFlag = zeros(1,numPts);
42: clusterVotes = zeros(1,numPts);
51: thisClusterVotes = zeros(1,numPts);

Bye...

[yang Min]

very good

[Yang wool]

??? Subscripted assignment dimension mismatch.

Error in ==> D:\¹êÅç\MeanShift\MeanShiftCluster.m
On line 99 ==> clusterVotes(numClust,:) = thisClusterVotes;

Error in ==> D:\¹êÅç\MeanShift\testMeanShift.m
On line 25 ==> [clustCent,point2cluster,clustMembsCell] = MeanShiftCluster(x,bandwidth);