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Avoid displaying blank page in RasterThumbnailbrowser
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#1
Posted
:
Saturday, November 4, 2006 12:10:52 AM(UTC)
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Posts: 7
Hi,
I am using dotnet v 2.0 and leadtools eval v14.5.0.13.
Can anyone tell me how to skip first few pages while loading multipage images in the RasterThumbnailBrowser?
Thanks,
Sham.
#2
Posted
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Sunday, November 5, 2006 3:45:13 AM(UTC)
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There is no direct way to do this. There are two possible workarounds:
1) After the entire file is loaded, delete the thumbnails you don't
want by using the RasterThumbnailBrowser.Items.Remove method.
2) Add a handler for the LoadThumbnail event which occurs before each
image is inserted into the image list. Whenever you want to
discard an image, set e.Cancel to true and call Items.Remove.
#3
Posted
:
Sunday, November 5, 2006 7:26:46 PM(UTC)
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Posts: 7
Sorry, i should have put the question properly.
Am trying to load the dicom images in the thumbnail browser. Some dicom images comes with first page/frame as blank. So when this image is loaded thumbnail browser displays blank page. My question was how to avoid this blank page.
#4
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Monday, November 6, 2006 4:48:45 AM(UTC)
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Your explanation in the first post was clear enough. I understood
that you want to tell the thumbnail browser not to load the first page
of the file which is blank. If this is what you want to do then
the two approaches above will help you do that.
#5
Posted
:
Monday, November 6, 2006 9:18:17 PM(UTC)
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Posts: 7
Let me explain like this,
Each Dicom file has multiple pages/Frames in it. It varies by approx 30 to 200 pages/frames per dicom file.
Now lets say my image dir has 6 dicom files in it. RasterThumbnailbrowser picks up the first frame from each dicom file and displays it. So i get 6 images listed in the thumbnail browser. Sometimes the first image/frame in the dicom file is left blank, then a blank image is displayed in the browser. The 2 methods you had mentioned above removes the image itself from the browser list. This, i don't want to happen.
If the first page/frame in the dicom file is blank, then i have to skip the blank frame and display the next one from the same dicom file.
#6
Posted
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Tuesday, November 7, 2006 4:59:36 AM(UTC)
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Try the following:
In the LoadThumbnail event, check the Image member of the
RasterThumbnailBrowserLoadThumbnailEventArgs parameter. If it is
not blank, do nothing. Otherwise, load the second page of the
file (the file name is in the FileName member) into the Image member
and that page will be the one added to the list.
Now, the problem of determining whether an image is blank or not is
another problem. The simplest way is to count the number of
colors using the ColorCountCommand class. If the count is 1, the
image is blank. Otherwise, it isn't. However, this method
will not work if the image came from a scanner and might contain some
noise. Since you are dealing with medical images, I am assuming
that this is probably not the case.
#7
Posted
:
Wednesday, November 8, 2006 1:40:08 AM(UTC)
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Posts: 15
Thanks, Let me try that one
LEADTOOLS Support
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General Questions
Avoid displaying blank page in RasterThumbnailbrowser
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