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Re: [help-GIFT] Processing multiple-example-queries

From: Henning Müller
Subject: Re: [help-GIFT] Processing multiple-example-queries
Date: Thu, 31 Jul 2003 14:34:45 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3b) Gecko/20030210

When using relevance feedback you should really use all feature groups and you will see that the results improve a lot, especially when using negative feedback. Positive feedback alone often only does a reordering of the first few images.

The color histogram is not very good for feedback. The color blocks by contrast are not extremely good for single-image queries but are getting much better when several images are fed back.

Cheers, Henning

Sailesh Suvarna wrote:

Hello all,

How does GIFT process multiple-example-queries? Does it combine the features to 
form a single composite query?

From some preliminary experiments, using single-example queries always gave 
better results than using 2 and 3-example queries in terms of Interpolated
Recall-Precsion and using only the  Global Colour Histogram feature.

Sailesh Suvarna

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Dr. Henning Müller
University Hospitals of Geneva
Division of Medical Informatics
21, rue Micheli-du-Crest
CH-1211 Geneva 4, Switzerland
Tel  +41 22 372-6175
Fax  +41 22 372-8680
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