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Finding sum of all pixel values of a gray image

asked 2015-12-02 00:48:49 -0500

VPallavi gravatar image

I want to find the sum of all pixel values of a gray image(Mat type). For that i need to access each pixel's intensity value. How can I do this in java? I'm using opencv library with it. In OpenCV we can use the following code:

for(int j=r.y;j<(r.y+r.height);j++)
    {
      for (int i=r.x;i<(r.x+r.width);i++)
      {
         int d= gray_image.at<uchar>(j,i);
         sum+=d;
      }
    }

Please suggest a solution to code it in java. Thanks!! I have tried it by using "Raster" as follows:

Raster raster = Gray_image.getRaster();

but I'm getting following error: The method getRaster() is undefined for the type Mat

Please help me!!

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in c++you can use mean

LBerger gravatar imageLBerger ( 2015-12-02 01:14:14 -0500 )edit

I need to find in java.

VPallavi gravatar imageVPallavi ( 2015-12-02 01:18:20 -0500 )edit

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answered 2015-12-02 01:25:17 -0500

berak gravatar image

http://docs.opencv.org/java/3.0.0/org...

(the docs are your friend !)

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Eduardo gravatar imageEduardo ( 2015-12-02 03:17:31 -0500 )edit

I think Integral Images are great if your image isn't changing and you have to do many different sums of rectangles super fast ...but no point in creating one just so you can take one intergral.

lindsay gravatar imagelindsay ( 2019-09-19 08:17:01 -0500 )edit
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Asked: 2015-12-02 00:48:49 -0500

Seen: 6,990 times

Last updated: Dec 02 '15