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Re: KMean Clustering of RGB Images [message #53925 is a reply to message #53904]

Tue, 08 May 2007 06:13

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

helaha@gmx.net schrieb:
> Recently I tested the Kmeans clustering of an RGB image with the
> CLUSTER and CLUST_WTR commands.
> The results were not very promising, because they depended on the
> image orientation and on the number of image pixels.
> I'm not a specialist in clustering, but in my opinion the results
> should be identical, especially regardless of the order of the data
> points.
>
Not sure what you mean by "order of the data points". But any clustering
algorithm that minimizes a cost function (like k-means) can get trapped
in a local minimum. The IDL help for CLUST_WTR says

"Because the initial clusters are chosen randomly, your results may
differ slightly each time the CLUST_WTS routine is invoked, even for the
same input data. For data with well-defined clusters the differences
should be slight. For randomly-scattered data (no distinguishable
clusters), the results may be significantly different, which may
indicate that k-means clustering is not appropriate for your data."

- Mort

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[Message index]

		Re: KMean Clustering of RGB Images By: Mort Canty on Wed, 09 May 2007 07:43
		Re: KMean Clustering of RGB Images By: helaha on Wed, 09 May 2007 05:08
		Re: KMean Clustering of RGB Images By: Mort Canty on Wed, 09 May 2007 04:36
		Re: KMean Clustering of RGB Images By: helaha on Wed, 09 May 2007 03:00
		Re: KMean Clustering of RGB Images By: Mort Canty on Tue, 08 May 2007 06:13

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