Comparing 2 Images using Confidence

Discussions about Automatic Document Recognition in GdPicture.NET.
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super22
Posts: 3
Joined: Sun Sep 27, 2009 1:53 am

Comparing 2 Images using Confidence

Post by super22 » Sun Sep 27, 2009 2:15 am

Hi There,

I am wanting to compare different quality/compression levels of images however the ADRGetLastConfidence always returns the same value: 40. regardless of whether I compare the original image to a high quality format or a low quality format. You can visually see the difference in images attached.

I have based the code on this example - viewtopic.php?t=1450#4728

Code: Select all

        Dim oGdPictureImaging As New GdPicture.GdPictureImaging
        Dim Confidence As Double

        oGdPictureImaging.SetLicenseNumber("XXXX") 'Replace with your own license key
        Dim ImageID1 As Integer = oGdPictureImaging.CreateGdPictureImageFromFile("orig.jpg")
        Dim ImageID2 As Integer = oGdPictureImaging.CreateGdPictureImageFromFile("low.jpg") 'comment to test high quality image
        'Dim ImageID2 As Integer = oGdPictureImaging.CreateGdPictureImageFromFile("high.jpg") 'uncomment to test high quality image

        Dim TemplateID As Integer = oGdPictureImaging.ADRCreateTemplateFromGdPictureImage(ImageID1)
        oGdPictureImaging.ReleaseGdPictureImage(ImageID1)
        oGdPictureImaging.ADRGetCloserTemplateForGdPictureImage(ImageID2)
        oGdPictureImaging.ReleaseGdPictureImage(ImageID2)
        Confidence = oGdPictureImaging.ADRGetLastConfidence()
        oGdPictureImaging.ADRDeleteTemplate(TemplateID)

        MsgBox("The two image are the same at: " & Str(Confidence) & "%")
1) Why is the confidence level so low?

2) Why is the confidence level not changing when I compare different compressed files?

Hope you can help!
Attachments
low.jpg
low.jpg (2.83 KiB) Viewed 2931 times
high.jpg
high.jpg (7.26 KiB) Viewed 2931 times
orig.jpg
orig.jpg (51.15 KiB) Viewed 2931 times

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Loïc
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Re: Comparing 2 Images using Confidence

Post by Loïc » Sun Sep 27, 2009 12:27 pm

Hi Super22,

Your image is a quite special... However, I implemented a patch to the ADR engine to process it correctly.

Please, wait for the next release (next Monday) to get the problem fixed.

With best regards,

Loïc

super22
Posts: 3
Joined: Sun Sep 27, 2009 1:53 am

Re: Comparing 2 Images using Confidence

Post by super22 » Sun Sep 27, 2009 1:15 pm

Thanks Loïc for your quick response, I look forward to the next release!

I'm interested in what makes the image special. Are you able to share any more information?

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Loïc
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Re: Comparing 2 Images using Confidence

Post by Loïc » Sun Sep 27, 2009 9:35 pm

You are welcome !

Your image is very bright, so thresholding (for content analys) were resulting in a fully blank image...

But now it is ok :mrgreen:

Loïc

super22
Posts: 3
Joined: Sun Sep 27, 2009 1:53 am

Re: Comparing 2 Images using Confidence

Post by super22 » Mon Oct 05, 2009 4:24 am

I just tested the Latest version (October 2, 2009) and the issue is resolved.

Thanks Loïc!

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Loïc
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Joined: Tue Oct 17, 2006 10:48 pm
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Re: Comparing 2 Images using Confidence

Post by Loïc » Mon Oct 05, 2009 11:32 am

Thank you for the feedback !

Loïc

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