image - 值(value)观的作用

Question

我正在使用 Mat_<float> aque(3,3);

aque << .240 , .640 , .450
        ,0,0,0
        ,0,0,0

我想把它变成浅蓝色，我该如何调整这些值？我想知道矩阵中这三个值 .240、.640、.450 的功能，我知道这些都呈现蓝色，但它们的功能是什么？

Answer 1

去自己做实验？

int f[9] = {24,64,45,0,0,0,0,0,0};  // initial trackbar pos
Mat filt(3,3,CV_32F); 
Mat img;

void onTrack(int,void*)
{
    float *p = filt.ptr<float>(0);
    for ( int i=0; i<9; i++ )
    {
        p[i] = float(f[i]) / 100;   // get it back to [0..1] range for the transform matrix
    }
    Mat out;
    cv::transform(img,out,filt);
    imshow("result",out);
}

int main( int argc, const char** argv )
{
    img = imread("lena.jpg");
    namedWindow("result",0);
    namedWindow("sliders",0);
    createTrackbar("1","sliders",&f[0],100,onTrack);
    createTrackbar("2","sliders",&f[1],100,onTrack);
    createTrackbar("3","sliders",&f[2],100,onTrack);
    createTrackbar("4","sliders",&f[3],100,onTrack);
    createTrackbar("5","sliders",&f[4],100,onTrack);
    createTrackbar("6","sliders",&f[5],100,onTrack);
    createTrackbar("7","sliders",&f[6],100,onTrack);
    createTrackbar("8","sliders",&f[7],100,onTrack);
    createTrackbar("9","sliders",&f[8],100,onTrack);

    onTrack(0,0);
    waitKey();

    cerr << filt << endl;
    return 0;
}

如果您对结果感到满意，只需将每个 slider 值除以 100，然后从中组成一个过滤器矩阵。