OpenCV项目(29)|魔法换天​

如今智能手机里都有个“魔法换天”的特效，现看下如何实现的呢？

原始图

代码语言：javascript复制

enum MyShape{MyCIRCLE=0,MyRECTANGLE,MyELLIPSE};

struct ParamColorMap {
    int iColormap;
    Mat img;
};

String winName="False color";
static const String ColorMaps[] = { "Autumn", "Bone", "Jet", "Winter", "Rainbow", "Ocean", "Summer", "Spring",
                                    "Cool", "HSV", "Pink", "Hot", "Parula", "Magma", "Inferno", "Plasma", "Viridis",
                                    "Cividis", "Twilight", "Twilight Shifted", "Turbo", "User defined (random)" };
    ParamColorMap  p;
    Mat img;

    if (argc > 1)
        img = imread((argv[1]), IMREAD_GRAYSCALE);
        
    p.img=img;
    p.iColormap=0;

灰度图

代码语言：javascript复制

 imshow("Gray image",img);
 namedWindow(winName);

魔法换天

代码语言：javascript复制

static void TrackColorMap(int x, void *r)
{
    ParamColorMap *p = (ParamColorMap*)r;
    Mat dst;
    p->iColormap= x;
    if (x == COLORMAP_COOL  1)
    {
        Mat lutRND(256, 1, CV_8UC3);
        randu(lutRND, Scalar(0, 0, 0), Scalar(255, 255, 255));
        applyColorMap(p->img, dst, lutRND);
    }
    else
        applyColorMap(p->img,dst,p->iColormap);

    putText(dst, "Colormap : " ColorMaps[p->iColormap], Point(10, 20), FONT_HERSHEY_SIMPLEX, 0.8, Scalar(255, 255, 255),2);
    imshow(winName, dst);
}

秋天

代码语言：javascript复制

    createTrackbar("colormap", winName,&p.iColormap,1,TrackColorMap,(void*)&p);
    setTrackbarMin("colormap", winName, COLORMAP_AUTUMN);
    setTrackbarMax("colormap", winName, COLORMAP_COOL 1); 
    setTrackbarPos("colormap", winName, -1);

    TrackColorMap(0, (void*)&p);

    cout << "Press a key to exit" << endl;
    waitKey(0);

春天

冬天

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特效

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