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Re: [help-GIFT] what is InvertedFileFeatureDescription.db ?

From: ller <address@hidden>
Subject: Re: [help-GIFT] what is InvertedFileFeatureDescription.db ?
Date: Fri, 24 Jan 2003 10:10:47 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.0) Gecko/20020530

For gift-generate-inverted-file you can take whatever image in ppm format as you want as an input. It gives you a description of every possible feature that is extracted by the system, with feature number and then the description such as HSV values and for the Gabors scale, direction and quantization information. This helps you to make a connection between the feature number and the actual information contained in the feature.

The InvertedFileFeatureDescription.db contains only part of the above information, the feature number and the feature group (color blocks, color histogram, gabor blocks, gabor histogram, value from 0 to 3) This information is needed in the gift for the calculation of the similarity scores. A histogram intersection is used for the histogram features and an tf/idf based weighting function is used for the block features

ADI stands for addition document information and it is generated for the feature file (*.fts) of every image. I think it contains things such as the maximum document frequency of a feature in the corresponding image. Wolfgang, any more details? This additional information is needed for some of the weighting schemes.

I hope this helps.

Cheers, Henning

Prawit Chaivong wrote:

hi ,
i'm writing script for prepare database (like )
and i try to learn from . Then i found it extracted feature of each images and create .db and .ADI file by "gift-generate-inverted-file" .that mean you must have url2fts.xml and InvertedFileFeatureDescription.db . url2fts.xml, i can make it but i have a problem with InvertedFileFeatureDescription.db , I know ,It come from "gift-write-feature-descs" script that received one argument . And argument must be .ppm filename . This points make me confusing because i don't know
which file that i should put in script
and last thing . I don't know ,what the InvertedFileFeatureDescription.db do ? and wheater each .ADI came from the same InvertedFileFeatureDescription.db or not ?
thank for help
Prawir Chaivong

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Dr. Henning Mu"ller
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
email address@hidden

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