Applying NDVI indicator on JPEG images in Android using OpenCV

asked 2017-01-30 04:20:19 -0600

I am a beginner in image processing. I have a set of survey images of a farm which I have stitched (eliminating the overlap) and the result is one single image (JPEG) of the entire farm. I want to apply different algorithms on this image for analysis. I want to apply the NDVI index on this farm image and for that I need to do raster calculations.

Can someone tell me the workflow or the steps that I will need to perform to produce a NDVI image of the farm in Android using OpenCV?

Is it possible by OpenCV? If not, what are the other ways to produce this output in Android?

answered 2017-01-30 05:19:04 -0600

LBerger
9317 ●2 ●20 ●88 http://www.traimaocv.fr

updated 2017-01-30 05:20:02 -0600

yes it's possible to calculate a ratio by pixel using opencv

      Mat bgr;

     ....
      vector<Mat> p;

       split(bgr, p);

        Mat num;
        subtract(p[0], p[2], num,Mat(),CV_32F);
        Mat den;
        add(p[0], p[2], den, Mat(),CV_32F);
        Mat ratio;
        divide(num, den, ratio,CV_32F); // and hope that den is never equal to 0. you can add 0.01 to den

Now about NDVI : p[0] is NIR and p[2] is visible but is it true for your sensor?

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For pictures taken by our camera, NIR is present in blue channel of the image. It is not available separately.

harsh1411 ( 2017-02-01 03:33:13 -0600 )edit

then you can use this answer

LBerger ( 2017-02-01 13:28:33 -0600 )edit

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Applying NDVI indicator on JPEG images in Android using OpenCV

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