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Re: [help-GIFT] Asymmetric Similarity Matrix

From: Henning Müller
Subject: Re: [help-GIFT] Asymmetric Similarity Matrix
Date: Thu, 16 Apr 2009 08:14:21 +0200
User-agent: Thunderbird (Windows/20090302)

Dear Juan,

this is normal as the similarity measure of GIFT is not a metric as it is based on a tf/idf weighting form text retrieval. Image similarity is calculated in the space spanned by the features present in the query, only. Each image has around 1500 features out of 87000 possible (most of them binary features), so each image potentially spans a different sub-space in which similarity is calculated.

Cheers, Henning

Juan C. Caicedo a écrit :
Hello everybody,

We are building a similarity matrix of an image collection using GIFT. However, we notice that this matrix is not a symmetric one. Could anybody tells us what is the reason of this behaviour and some hints to obtain a symmetric similarity matrix?

Thanks in advance to all you.

Juan C. Caicedo


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