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Normalisation

Started by Ructions Jan 19, 2005 at 10:13 AM 0 replies 650+ views

Original Post

Jan 19, 2005 at 10:13 AM

I am writing a fingerprint recongition program and want to normalise the image so that i standardise the intensity values of the pixels by adjusting the range of the grey-level values so that they they lie within a desired range of values. i want to do this because i want to contrast between the ridge and valleys in the image. But i dont really know how to do it. Any suggesting or code example would be great thanks in advance ructions

civguy

Jan 19, 2005 at 10:25 AM

You find the maximum and minimum values. Then for each pixel value, you substract the minimum value and then divide it by the difference between the maximum and the minimum.

3 6 4 => 0 3 1 => 0 1 0.333...

If you want it on range 0-255, then multiply by 255. If you don't want to use floating point numbers, multiply by 255 before the division.

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