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The problem of the mask?

asked 2018-03-11 08:08:24 -0500

Weifa Gan gravatar image

updated 2018-03-11 08:45:13 -0500

LBerger gravatar image

I don't know how to use the mask. Some problem has occur when i use the following codes,but i don't know why. please help me to understand.thank you!

#include<iostream>
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>

using namespace std;
using namespace cv;
int main()
{
    Mat_<float> m(3, 3);
    m << 1.0f, 2.0f, 3.9f, 4.0f, 5.0f, 6.0f, 7.7f, 8.0f, 9.0f;

    Mat_<int> mask1(3, 3);
    mask1 << 1, 2, 3, 0,1,2,3,0,0;

    Mat m2;
    m.copyTo(m2,mask1);

    cout<< m2 << endl;

       system("pause");
}
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answered 2018-03-11 08:53:13 -0500

LBerger gravatar image

updated 2018-03-12 11:59:00 -0500

" Some problem has occur" must we guess it?

a mask is binary 0 or non zero and it should be uchar

Mat mask = (Mat_<uchar>(3, 3) << 1, 1, 1, 0, 1, 1, 1, 0, 0);
Mat_<float> m(3, 3);
m << 1.0f, 2.0f, 3.9f, 4.0f, 5.0f, 6.0f, 7.7f, 8.0f, 9.0f;
Mat m2;
m.copyTo(m2, mask);

becarefull some values of m2 are not initiliased

I think books are always necessary : Learning OpenCV: Computer Vision with the OpenCV Library Par Gary Bradski,Adrian Kaehler

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Yeah,Thanks a lot.And how do you know that?

Weifa Gan gravatar imageWeifa Gan ( 2018-03-12 07:02:17 -0500 )edit
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Asked: 2018-03-11 08:08:24 -0500

Seen: 76 times

Last updated: Mar 12