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#1 Posted : Tuesday, June 14, 2005 11:16:52 AM(UTC)
martin_Smalley

Groups: Registered
Posts: 4


Found the example on this site to remove blank pages which works great for B&W (text/photos) images at any resolution, however when you scan using Grayscale or color at any resolution, it always finds a region and fails to report a pure blank page as being blank. Does anyone have any ideas? I tried Mean/Average to try and remove any dust specs, but that didn't help even with a brand new pure white page.....cleaned the glass too :) Maybe convert the Grayscale to B&W and retest?

'**  scanning an ImageList (Images)  for blanks

With LEAD1

       For tempint = Images.Count - 1 To 0 Step -1

               .BitmapList = 0

               .InsertBitmapListItem -1, Images.Item(tempint).BitMap

              .SetRgnColor RGB(255, 255, 255), L_RGN_SETNOT

              .RgnFrameColor = vbRed

             .RgnFrameType = RGNFRAME_STATIC

             If .GetRgnArea = 0 Then

                  Images.Remove (tempint)

             End If

       Next

End With

 

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#2 Posted : Tuesday, June 14, 2005 11:59:01 AM(UTC)

Gabe  
Gabe

Groups: Registered, Tech Support
Posts: 46


Thank you for your interest in LEAD and LEADTOOLS.
I am not sure which version of LEADTOOLS you are using. See if you have the SetRgnColorRGBRange. If so, you can use that method to specify a range of values to set in the region.
Also, you may be able to adjust the GetRgnArea check to be greater than 0. For example, you could use a percentage of the image instead of a hardcoded value:
If .GetRgnArea/(.BitmapWidth * .BitmapHeight) < .05Then '5% of the image.
Another idea is to Threshold the image first. This will make near white, white and near black, black. Take a look at the IntensityDetect method.
Hope this helps,

Edited by moderator Thursday, March 30, 2017 1:20:04 PM(UTC)  | Reason: Not specified

Gabe
Developer Support
LEAD Technologies, Inc.

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#3 Posted : Friday, June 17, 2005 6:11:53 AM(UTC)
martin_Smalley

Groups: Registered
Posts: 4


Worked great! Thanks for the info.

 
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