一些常用的函数

---------------------- 从热度图转换到灰度图（matlab）

disparity_image = (imread('jet.png'));

figure,imshow(disparity_image);

cmap = jet(256);
gray = rgb2ind(disparity_image,cmap);
figure,imshow(gray);

 

 

--------------------------  c程序运行时间

　clock_t start, finish;
    double totaltime;
    start = clock();

    代码

    finish = clock();
    totaltime = (double)(finish - start) / CLOCKS_PER_SEC;
    cout << "\n此程序的运行时间为" << totaltime << "秒！" << endl;