Image statistics reports negative mean value for big images

[GoogleCodeExporter]

In the case of big images (around 4000x3000) images statistics calculates 
incorrect mean value, which is negative.

Original issue reported on code.google.com by andrew.k...@gmail.com on 12 Sep 2007 at 4:43

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Original comment by andrew.k...@gmail.com on 13 Sep 2007 at 4:22

• Changed state: Started

[GoogleCodeExporter]

AForge.Math.Statistics.Mean() was fixed to use double for mean calculation 
instead 
of int.

SVN revision - 345, will be released in AForge.NET 1.5.0

Original comment by andrew.k...@gmail.com on 13 Sep 2007 at 4:25

• Changed state: Fixed

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Original comment by andrew.k...@gmail.com on 13 Sep 2007 at 4:27

• Changed state: Verified

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Original comment by andrew.k...@gmail.com on 19 May 2008 at 6:08

• Changed state: Released

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The mean and standard deviation calculations are still incorrect for larger 
images. It seems to work fine for 1024x1024 or less, but I get incorrect values 
for 1280x1024 grayscale images.

Original comment by carrasm...@gmail.com on 18 Jul 2011 at 5:18

[GoogleCodeExporter]

Problem confirmed with this image.

Original comment by br...@sistemasmart.com.br on 14 Apr 2014 at 1:29

Attachments:

• 2014-03-18-10-43-04_18032014104822454971.jpg

[GoogleCodeExporter]

Updated calculation of mean in AForge.Math.Statistics to use double precision 
numbers internally to avoid integers' overflow.

Committed in revision 1730.

Original comment by andrew.k...@gmail.com on 23 Apr 2014 at 7:41

• Changed state: Fixed
• Added labels: Project-Math
• Removed labels: Project-Imaging