What does indexing do?

Just what does indexing do? I clicked on a photo & asked the program to find a similar photo & the reply was that I would get better results if I indexed first. Now the crazy part I went to the PSE 10 manual & did a text search but the stupid manual is useless since it doesn't even contain the word 'indexing', the closest you get is a passing mention of 're-indexing'.

photodrawken wrote:
MichelBParis wrote:
What I have found is that this index is a file : itemdata.mk4 within the catalog folder.
If I'm not mistaken, the visual similarity searches also use data contained in the "WaldoData" directory, which has several files in it.
MichelBParis wrote:
What I still can't imagine is also how the resulting 'signature' can have a numerical order to be used in an index.
Ken
In PSE6 there is no Waldo subfolder, only in my PSE10.
photodrawken wrote:
MichelBParis wrote:
MichelBParis wrote:
What I still can't imagine is also how the resulting 'signature' can have a numerical order to be used in an index.
It wouldn't necessarily need a numerical order value. I don't have any idea how PSE does its Visual Similarity searches, either, but for purposes of discussion, consider this:
If one of the criteria used is "light coloured blob in the center of the image", then all PSE would have to do is store the image IDs of the images that fit that criteria. If a user uses an image with a light coloured object as the VS search item, PSE would use the index to quickly retrieve those image IDs and display images of, for example, portraits or a boat on the water, etc.
Quite a few years ago, IBM developed a "Query By Image Content" (QBIC) application which is stunning in its capabilities and accuracy. You can use QBIC at the State Hermitage Museum (St. Petersburg, Russia) Web site to search for images in its collection:
http://www.hermitagemuseum.org/fcgi-bin/db2www/qbicSearch.mac/qbic?sel Lang=English
Then I believe the word 'indexing' is slightly inadequate. It is rather a kind of multicriteria tagging.
I happen to use the visual similarity feature, but I don't use any of the autoanalyzer functions nor face recognition. I suppose the 'Waldo' subfolder was introduced for those automatic functions.

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Thanks!
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