Please help! How can I adjust brightness and contrast of BufferedImage?

Now I am working on Face Verification by Neural Network.i'm coding with java awt.i use BufferedImage.
So the problem is Face picture of one person but other place or other time is'n same. so i would like adjust picture to standard that i set.How can I do?
picture is 20*24 Pixel 8 bit Grayscale
Thank you so much I will appreciate to your helps

Hello!
Try to go on http://www.dai.ed.ac.uk/HIPR2/index.htm
I hope You'll find Your answer;-)
CU - troya

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