opencv 图像叠加滚动条

#include<opencv2/opencv.hpp>#include<iostream>#define WINDOW_NAME "图像叠加"using namespace std;using namespace cv;const int g_nMaxAlphaValue = 100;//alpha的最大值int g_nAlphaValueSlider;//滑动条对应的变量double g_dAlphaValue;double g_dBetaValue;//申明存储图像的变量Mat g_srcImage1;Mat g_srcImage2;Mat g_dstImage;Mat g_dstImage2;//回调函数void on_Trackbar(int ,void*) {g_dAlphaValue = (double)g_nAlphaValueSlider / g_nMaxAlphaValue;g_dBetaValue = 1.0 - g_dAlphaValue;addWeighted(g_dstImage2, g_dAlphaValue, g_srcImage2, g_dBetaValue, 0.0, g_dstImage);imshow(WINDOW_NAME, g_dstImage);}int main() {g_srcImage1 = imread("C:\\Users\\Public\\Pictures\\Sample Pictures\\overwatch.jpg");g_srcImage2 = imread("C:\\Users\\Public\\Pictures\\Sample Pictures\\logo.jpg");g_dstImage2= g_srcImage1(Rect(800, 400, g_srcImage2.cols, g_srcImage2.rows));g_nAlphaValueSlider = 50;namedWindow(WINDOW_NAME, 1);char TrackbarName[50];sprintf(TrackbarName, "透明值 %d", g_nMaxAlphaValue);createTrackbar(TrackbarName, WINDOW_NAME,&g_nAlphaValueSlider,g_nMaxAlphaValue, on_Trackbar);on_Trackbar(g_nAlphaValueSlider, 0);waitKey(0);return 0;}这里就能看见我们可爱的DVA与logo叠加在一起了，通过滚动条可以调节透明度，来和DVA小姐姐玩捉迷藏吧