Image identifying & verification

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Hi...guys . am now doing my final year project in c#. so am in need to know how the image can be identified & verified. can anyone else help me.....Plz. :(( :((

Posted 21-Feb-11 22:19pm

ognale

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Albin Abel 22-Feb-11 5:33am

So it means a captcha? in that case create a random string..create bmp, draw the string and patterns on that bmp's graphics. save the bmp and update the image url to the url path of the saved file location. The random string you may keep in the session cache. On submit veryfy this. If this is the one you want then will give you detailed steps

3 solutions

Solution 3

Here you mentioned to "load a bitmap image from my form to SQL backup and then retrieve the same image".

You could iterate through all pixels of one image and check if the other image, at identical co-ordinates, returns identical color values.
But I can only guess that at the time you get the image from your database, there is no image on the form to compare with.

Therefore think of creating a checksum (CRC, MD5 or the like) for the image on your form. Store it along with the image in the database.

Then, after retrieving image and checksum from the database, create the checksum again and compare with the one just retrieved.
Identical images should produce identical checksums. Differing images have a very high probability to produce different checksums as well.

Posted 21-Feb-11 23:56pm

lukeer

Solution 1

Hope Image Verification Helper Class[^]article from CP might help you.

Posted 21-Feb-11 22:44pm

Ramalinga Koushik

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lukeer · Accepted Answer · 2011-02-21T22:49:00

Solution 2

It depends on whether "the image" was created by Piasso, a Sony Finepix or Norton Ghost.

Please clarify what you are trying to accomplish.

Posted 21-Feb-11 22:49pm

lukeer

Comments

JF2015 22-Feb-11 5:57am

Don't know why this was downvoted - have my 5 anyway.

Sergey Alexandrovich Kryukov 22-Feb-11 12:44pm

Because not everyone can get the humor of the answer :-)
--SA

Sergey Alexandrovich Kryukov 22-Feb-11 12:46pm

Lukeer,
I voted 5, just for LOLs. Brainwash is also userfull.
(Did you misspell "Piasso"? - ps-s...)
--SA