feature extarction of an image

I have extracted features of an image ,now i ahev to select best features of an image,can anyone sugest which algorithm is best for this one please

[Junaid]

What kind of features you have extracted. Please provide more information. As the features you are using are global features, i.e. histograms: or local features i.e., SIFT, SURF etc..

[kash]

i have extracted the features as u said histogram,mean,variance and masking process of an image,i want to select best feature in these three,please help

[Junaid]

Dear Kash, All features are important, and the better can be evaluated by application you are using. So far in Global features Histograms are very famous. But again I will mention that selection of features are related to the application. Try using Histograms.

[kash]

Junaid I have to retrieve the image,before that i have to select some features using an algorithm,i need an algorithm which selects the best features,

Answer 1

[Image Analyst]

The best features are those that discriminate the things that you are looking for. Perhaps you can use Principal Components Analysis to find out which ones contributed most to the "correct" answer.

[kash]

CAn we apply electromagnetism for selecting the features

[kash]

Before applying PCA i have to select best fetaures ,how to select it ,is there any algorithm for that

[Image Analyst]

I'm sure electromagnetism will be involved in the solution. It is what runs all computers. Yes, there is PCA code. Luckily I work in a large company with dozens of talented statisticians with Ph.D.s, so I leave my needs up to the professionals because I need to know it's done right. So I don't do it myself at the risk of screwing it up. It's more than just running the things through some recipe - interpretation is also important.

There is a statistics toolbox - have you looked in there?

[kash]

statistics toolbox for PCA or electromagnetism,if reashers like you say "I need to know it's done right",ten ,we students how can perform correctly,ca u guide me please

[Image Analyst]

I would not be the one to guide you. You should probably make another post with the subject line "How do I use PCA?" if you can't find any local friends who can help you.

[Walter Roberson]

If you do not know exactly what you want to do, you will never know whether what you end up with was done right or done poorly.

[kash]

Walter at present please suggest some technique,where i can select best features ,i am struck here for long time please help

[Salma Hassan]

plz sir Image Analyst i used lbp to extract the features 256 features but these features for the whole image , my question is how to determine only the features i interest ( only piece of image )

[Image Analyst]

As, I don't see what this has to do with Kash's question. Let's not clutter up his discussion, and bug him with emails about new activity on his question, so why don't you post your question as a new question?