Re: TIF Image Compare

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Monday, January 22, 2007 10:35:39 AM(UTC)

dsubryan

Groups: Registered
Posts: 15

Hello,

I am currently using Leadtools Raster Imaging 14.5 for .NET. I have a question about the software. If I receive a file that is in TIF format, that has multiple pages, is there a way using raster imaging pro sdk to tell if there is a blank page in the fax?

I am not familiar with the image analyzing functions of the product.

Thanks,
David


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#2 Posted : Tuesday, January 23, 2007 12:31:06 AM(UTC)

Adnan Ismail

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

Hello David,

To detect an empty page, one way to do that
is to calculate the ratio of white pixels to total image pixels, and if
it's above a certain threshold value, consider it empty. Ideally, the
threshold should be very close or equal to 100%, but you always get some noise when scanning real pages.

You can check the attached VB.NET sample demonstrates how to detect a blank page using LEADTOOLS .NET.

File Attachment(s):

DetectBlankPage.zip (28kb) downloaded 30 time(s).

#3 Posted : Tuesday, January 23, 2007 10:41:45 AM(UTC)

dsubryan

Groups: Registered
Posts: 15

Thank you for the quick response. This tool works fine with the first image loaded in the TIFF file. However what if the TIFF file contains multiple images. Is there a way to traverse through the TIFF file using leadtools?

Thanks,
David

#4 Posted : Thursday, January 25, 2007 5:42:20 AM(UTC)

Adnan Ismail

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

Hello David,

You can navigate through pages by changing the page index in the RasterImage.Page Property. For example to view next page in a multiple page image, you can
increment the Page property by 1 then try to detect if this is a blank image or not. The range for this property is from 1 to RasterImage.PageCount.

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