Hi,

I was wondering if there was a way to compare two images for similarity (i.e. checking to see if signature is same as signature on a credit card). Thankx in advanced.

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C++

Basicly there's three steps:
> 1. convert the two images to an array of integer.
> 2. compare the two arrays.
> 3. then decide if they're a similar or not.

You convert the two images into an array by creating a PixelGrabber, and then getting the pixels. You can also store colors and compare to make it more accurate.


Now, you can try just comparing Image Objects, but I don't know how accurate that would be:




I've never really done this, so I don't know how either approach will work out.

it is a very deep subject and hard one, and comparing pixel-by-pixel is a very slow approch, i suggest you searching "image processing"....
in GIMP's web site you can find source code of this program which is a very good image processing tool....

server_crash, i tried your second technique and it turns out the images are never the same. I'm going to try your first method. could you please go into a little more detail on the first method. specifically, what method in the pixel grabber class returns an array of ints. thanx.

tonakai, what exactly is gimp? I'm a little confused. thanx for trying to help.

I also have one more question:
How do you copy a pictre to the clipboard

Thanks for all your help. I really appreciate it.

gimp is a program like abode photoshop but it is free. and you can have the source code. they may also help you, because these guys are all interested in image processing.
you can also find ready to use image processing libraries, but i am not sure where to look. if you want next year i am going to have a course, so i can give more information

thanx. i edited my above post and added a few questions. could you help?

Thanks again.

I'm going somewhere right now, but I'll get back to you on the questions a little later...Hope you don't mind.

I think the method in pixel grabber is .grabPixels()

I dont think .grabPixels returns an array of ints. Second, just so you know, im trying to compare two signatures. they may be slightly different from each other.

thanx.

unfortunately, pixel grabber never works.

sorry for being vague. when i check if int array one = int array two, it always turns out false. when i check if pixelGrabber.grapPixels() == pixelGrabber.grabPixels() it's always true.

any suggestions ??????????
thanx.