I am trying to design a page in which we can upload an image and then compare the uploaded image

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I am a newbie asp.net .. I am trying to design a page in which we can upload an image and then compare the uploaded image with all the image in the database and display the images which match the uploaded image... I am not able to do the second part i.e comparing and didplaying related result ..so i need a help on that .. Thanks in advance

Posted 30-Apr-13 5:07am

coder_ski

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Dave Kreskowiak 30-Apr-13 11:41am

How do you want to compare the images? Are we talking an exact byte-for-byte comparison or what?

coder_ski 30-Apr-13 12:48pm

ya kindof

Dave Kreskowiak 2-May-13 21:59pm

No, no, no. There is no such thing as "kind of" in code. You either define PRECISELY what you mean by comparing an image or you can forget writing code. Why?? Because if you can't precisely define exactly what you mean by comparing images, how on this Earth are going to tell a computer how to do it??

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gggustafson · Answer 1 · 2013-05-02T13:15:00

I'm going to make some assumptions

1. You are comparing a single image with a number of images.
2. The comparison is a byte-to-byte comparison of two images.
3. Images are in the same format.

Then

C#

foreach image in database
    {
    images_equal = true
    if ( image.Size != uploaded_image.Size )
        {
        images_equal = false
        }
    else
        {
        foreach byte in the images
            {
            if ( image_byte != uploaded_image_byte )
                {
                images_equal = false
                break
                }
            }
        }
    if ( images_equal )
        {
        do something with equal images
        }
    else
        {
        do something with unequal images
        }
    }

The byte to byte comparison may require System.Runtime.InteropServices.