How to set threshold?

2013 3 6
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Hi, I have calculated the euclidean distance between the query image and 1000 images in the database.I have to display the top 5 images.Can you please say how to set threshold.I can't give threshold as some values based on the euclidean distance (threshold<20)because I have to do the same process for all the images in the database as query image.

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Image Analyst
Image Analyst 2013-3-6

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I don't understand why you think you need a threshold. I would think you would just need the sort() function.

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