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How to read the pixels of the three channels at the same time?

asked 2012-06-27 16:22:41 -0500

icedecker gravatar image

updated 2015-09-16 18:14:45 -0500

Hi, I'm trying to convert the following C++ code in Java (for an Android app). I need to sum the pixels in the three channels at the same time (and others operations). Any suggestions?

vector<Mat> channel; // in java List<Mat> channel = null;
split(img, channel); // in java org.opencv.core.Core.split(img, channel);

// sum the pixels of three channels - How to do it in Java? The it_r, it_g and it_b are iterators
for (; it_r != it_endr; ++it_r, ++it_g, ++it_b) {
    r = (double) *it_r;
    g = (double) *it_g;
    b = (double) *it_b;

    tmp = r + g + b;
    if (tmp > sum) {
        sum = tmp;
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answered 2012-06-28 08:23:41 -0500

Andrey Pavlenko gravatar image
Mat mRgb = ...
List<Mat> lRgb = new ArrayList<Mat>(3);
Core.split(mRgb, lRgb);
Mat mR = lRgb.get(0);
Mat mG = lRgb.get(1);
Mat mB = lRgb.get(2);
Mat mSum = new Mat();
Mat mEmpty = new Mat();
Core.add(mR,   mG, mSum, mEmpty, CvType.CV_16UC1);
Core.add(mSum, mB, mSum, mEmpty, CvType.CV_16UC1);
double maxSum = Core.norm(mSum, Core.NORM_INF);
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Thank you very much, it worked!

icedecker gravatar imageicedecker ( 2012-06-28 11:18:36 -0500 )edit

why my Eclipse can't recognize the "CV_16UC1" ?

maizi gravatar imagemaizi ( 2014-05-14 08:01:50 -0500 )edit

Hello Sir, I tried your code in my Android application in Java using openCv library, it did not work, I just wanted to split the colorful bitmap image into its three different rgb channel images. It will be so great if you could help me in this situation.

khatri.kelash gravatar imagekhatri.kelash ( 2017-01-21 11:27:51 -0500 )edit
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Asked: 2012-06-27 16:22:41 -0500

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Last updated: Sep 16 '15