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#1 Posted : Thursday, March 7, 2013 7:44:13 PM(UTC)

jc2000  
jc2000

Groups: Registered
Posts: 3


I am trying to compare two regions within the same RasterImage and determine (on a relative basis) which has more or less black or white pixels. The regions will not be the same size. I basically want to sum the darker pixels and sum the lighter pixels and divide each by total pixels in the region. This will give a DarkerRatio and a LighterRatio that I can use to compare the regions of interest.

How exactly can I do this? The RasterImage.GetData() method returns a Byte Array, but I am not sure this is what I need. Can I use this? If so, how exactly? If not, what exactly do I need to do?

Some sample code would be helpful.
 

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#2 Posted : Sunday, March 10, 2013 8:01:50 AM(UTC)

mohamed  
mohamed

Groups: Registered, Tech Support
Posts: 179


Although you can get the pixel contents, there is a much easier approach.

You may use the HistogramCommand (which is region aware) to get the information about occurrence of each intensity value. See the following online help topic:
http://www.leadtools.com/help/leadtools/v18/dh/pc/leadtools.imageprocessing.color~leadtools.imageprocessing.color.histogramcommand.html

You can then sum the upper entries in the table to get the light pixels and sum the lower entries to get the dark pixels.

Mohamed Abedallah
Developer Support Engineer
LEAD Technologies, Inc.

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