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

[ller <address@hidden>]

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 gift-add-collection.pl )
> and i try to learn from gift-add-collection.pl . 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
> Cheer
> Prawir Chaivong
>
>
>
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> help-GIFT mailing list
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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