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Date Posted: 08:01:09 04/28/04 Wed
Author: James Collings
Subject: Re: Fast image content compare
In reply to: Michel 's message, "Re: Fast image content compare" on 20:03:22 01/04/04 Sun

bit late, but why not just create CRCs fom the data of both images? Comparing 2 crcs and the size/resolution should be very fast and you'll have a good indication of whether the images are the same. If they have the same CRC, then you can compare the scanlines, just to be sure :-)

James

>
>Hi Dirk,
>
>No, I have not done this, but using the ScanLines
>property is probably the best bet.
>
>You can probably try things like skipping every second
>pixel to get an approximation.
>
>Best regards,
>
>Michel
>
>>Does anyone have an idea of how to fast compare two
>>images of the same size contained in two
>>TBitmapGraphics? The result should be something like a
>>"difference factor"...
>>
>>Currently I'm using the Scanlines property and compare
>>each pixel. Not very efficent, I think!
>>
>>Any ideas? Thanks!

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