image recognition or matching

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Hi every body,

I need your help to do code in vb.net to match image with other images in database.
I have database consist of images and name of image.
I preprocess image in database and let it black and white.
I need code to compare inserted image from out side with image in database
to find if there is similar one in database.

I understand that i need to divide image to 9 part
and compare each part with color and position of pixel and accept thid partion according to predetermine percentage, and I need to re-divide the central part and repaint the comparison but i don't now how to divide image and make this code
please help me to do this as soon as possible.

Thanks a lot

Posted 3-May-11 2:25am

hind_F

Updated 3-May-11 2:30am

Niklas L

v2

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Rajesh Anuhya 3-May-11 8:32am

can you tell me what type of images you are comparing??

hind_F 3-May-11 9:45am

i try to compare jpeg image type

NuttingCDEF 3-May-11 8:57am

Have you looked at OpenCV to see if there is anything there that will do what you want without having to rewrite it?

hind_F 3-May-11 9:45am

I dont know this techniqe can you help me to search on OpenCV

NuttingCDEF 3-May-11 10:10am

See http://opencv.willowgarage.com/wiki/

I haven't tried doing this, but OpenCV is a "library of programming functions for real time computer vision" and includes stuff (including some fairly sophisticated algorithms) for things like feature detection, object tracking etc., so might well have useful stuff.

I'd guess that a key would be what sort of images you are trying to compare (not the jpeg file format, but what the pictures are actually of) - things like images at different scales, different levels of brightness / contrast or a colour cast, differing resolutions, backgrounds that may need to be filtered out etc. can easily defeat simple algorithms so unless you are looking for extremely close matches I'd expect designing something from the ground up without building on experience of others could be a tough call.

Oh, and OpenCV is open source - free for academic or commercial use.

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E.F. Nijboer · Answer 1 · 2011-05-03T03:55:00

If the images should be the same pixel by pixel then simply calculate a checksum of the picture and store it in the database. When retrieving a match you calculate the checksum of that image and search with that. This will be a lot faster then matching the images itself. You can do a complete image compare with the results you get to be absolutely sure.

Good luck!

hind_F · Answer 2 · 2011-05-08T10:12:00

Solution 3

thanks for your helping
but i try do code to check the position of pixels in both image and accept it in 70 % and count the white color in both images then accept it if they have 75 % similar in both images

Posted 8-May-11 10:12am

hind_F

Aartishah22 · Answer 3 · 2011-09-09T19:32:00

Solution 4

If you have completed would you like to give me your source code.... my mail id is aartishah22@yahoo.com

Posted 9-Sep-11 19:32pm

Aartishah22