opencv第6讲--tracking_bar的使用

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Mat dst,m,src; int lightness = 50;   static void on_track(int, void*) {     m = Scalar(lightness, lightness, lightness);       add(src, m, dst);       imshow("亮度调整", dst); }   void QuickDemo::tracking_bar_demo(Mat& image) {     namedWindow("亮度调整", WINDOW_AUTOSIZE);       dst = Mat::zeros(image.size(), image.type());     m = Mat::zeros(image.size(), image.type());       src = image;       int max_value = 100;       createTrackbar("value bar", "亮度调整", &lightness, max_value, on_track);       on_track(50, 0); }