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Re: [help-GIFT] 'Re: Ups.

From: David Squire
Subject: Re: [help-GIFT] 'Re: Ups.
Date: Thu, 13 Apr 2006 16:28:05 +0100
User-agent: Thunderbird 1.5 (Macintosh/20051201)

address@hidden wrote:
the only reason i went with netPBM was one of my initial goals was to run against a whole one of my images, in native resolution. i've read that PPM has changed formats, and it looked to me like the PPM code in GIFT wouldnt
handle any images greater than 256x256.

GIFT rescales all images to 256x256 before feature extraction. This is essential for the way "block features" are extracted and indexed in the GIFT. If you have removed this rescaling, then you will have broken the feature extraction, since feature IDs depend on block positions, that rely on a fixed input image size.

I am not arguing that this is a particularly sensible thing to do, but that is the way the GIFT works at present.

The PPM code with the GIFT happily handles images of any size - I have used that PPM library in several other applications. It is the GIFT feature extraction that *requires* the rescaling to 256x256.



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