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Re: [help-GIFT] Colour blocks

From: Henning Müller
Subject: Re: [help-GIFT] Colour blocks
Date: Fri, 22 Aug 2003 16:29:25 +0200
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no, for the blocks no histogram is stored but only the mode color, which is the most frequent color in this block. Find information on mode here: This is done at various scales, first the image is divided into four blocks and then each of the block is divided into four smaller blocks again. Each color in any of the blocks is a feature, resulting in (4+16+64+256)x166 features.

Cheers, Henning

Madhvi WAHI wrote:


According to the paper--"Content-based query of image databases, inspirations 
from text retrieval: inverted files, frequency-based weights  and relevance
feedback; two sets of features are extracted from the quantized HSV colour
space, the first, a colour histogram and the second, colour blocks.

Are the colour blocks the same as histograms, that is, once the images are 
divided at four scales, are histograms calculated for each of these four
regions, to record the local information? Also, what is the meaning of mode 
colour being calculated for each block?


M. Wahi,

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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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