opencv图片转幻灯片视频

Posted 2020-10-23 Dirge

 

 1 /*g++ *.cpp `pkg-config --cflags --libs opencv` -std=c++11*/
 2 
 3 #include <opencv2/opencv.hpp>  
 4 using namespace std;  
 5 using namespace cv;  
 6 #define NUM_FRAME 300  
 7 #define SIZE 7  
 8   
 9 char path[100];//输入文件路径  
10   
11 //将图片序列转换为视频  
12 void getVideo()  
13 {  
14     int i = 0;  
15     IplImage* img = 0;//读入图像  
16     IplImage* outimg = 0;//修改图像尺寸  
17     char image_name[100];//图像名字  
18     char videoname[100];  
19     strcpy(videoname, path);  
20     strcat(videoname, "//1.avi");  
21       
22     //初始化视频编写器，参数根据实际视频文件修改  
23     CvVideoWriter *writer = 0;  
24     //从文件读入视频  
25     CvCapture* capture = cvCaptureFromAVI(videoname);  
26     //读取和显示  
27     int isColor = 1;  
28     IplImage* frameimg;//从视频中提取的帧图像  
29     int fps = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);//视频的fps  
30     int frameH = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);//视频的高度  
31     int frameW = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);//视频的宽度  
32     writer = cvCreateVideoWriter("..//output//2.avi",-1, fps, cvSize(frameW, frameH), isColor);//创建视频写入  
33     printf("\tvideo height : %d\n\tvideo width : %d\n\tfps : %d\n", frameH, frameW, fps);  
34     //创建窗口  
35     cvNamedWindow("mainWin", CV_WINDOW_AUTOSIZE);  
36     //读入图片，并制作幻灯片  
37     while (i<SIZE)  
38     {  
39         CvSize Out_Img_size;//图片的大小  
40         Out_Img_size.width = frameW;//使读入图片的大小与视频尺寸相同  
41         Out_Img_size.height = frameH;  
42         sprintf(image_name, "%d%s", ++i, ".jpg");//得到图片名字  
43         char imgname[100];  
44         strcpy(imgname, path);  
45         strcat(imgname, "//");  
46         strcat(imgname,image_name);//加上路径  
47         img = cvLoadImage(imgname);//打开图片  
48         outimg = cvCreateImage(Out_Img_size, img->depth, img->nChannels);//创建一张与视频帧大小相同的图像  
49         cvResize(img, outimg, CV_INTER_LINEAR);//让打开的图像重写为指定大小  
50         if (!img)  
51         {  
52             printf("Could not load image file...\n");  
53             exit(0);  
54         }  
55         //设置字体  
56         CvFont font;  
57         cvInitFont(&font, CV_FONT_VECTOR0, 0.5f, 0.5f, 0, 1, 8);  
58         //在图像中显示文本字符串  
59         cvPutText(outimg, "StudentID", cvPoint(frameW - 100, frameH - 60), &font, CV_RGB(255, 255, 255));  
60         cvPutText(outimg, "name", cvPoint(frameW - 100, frameH - 30), &font, CV_RGB(255, 255, 255));  
61         char key = cvWaitKey(20);//等待  
62         //将图像写入视频，重复25次是为了使之放映速度变慢  
63         for (int j = 0; j < 25; j++) {  
64             cvShowImage("mainWin", outimg);  
65             cvWriteFrame(writer, outimg);  
66         }  
67     }  
68     i = 0;  
69     while (1)  
70     {  
71         frameimg = cvQueryFrame(capture); //获取一帧图片  
72         if (!frameimg)break;//读到尽头，退出  
73         //设置字体  
74         CvFont font;  
75         cvInitFont(&font, CV_FONT_VECTOR0, 0.5f,0.5f , 0, 1, 8);  
76         //在图像中显示文本字符串  
77         cvPutText(frameimg, "StudentID", cvPoint(frameW - 100, frameH - 60), &font, CV_RGB(255, 255, 255));  
78         cvPutText(frameimg, "name", cvPoint(frameW - 100, frameH - 30), &font, CV_RGB(255, 255, 255));  
79         cvShowImage("mainWin", frameimg);  
80         char key = cvWaitKey(20);  
81         //将视频帧写入视频  
82         cvWriteFrame(writer, frameimg);  
83     }  
84     cvReleaseVideoWriter(&writer);  
85     cvDestroyWindow("mainWin");  
86 }  
87   
88 int main(int argc, char** argv)  
89 {  
90     strcpy(path, argv[1]);  
91     getVideo();  
92     waitKey();  
93     system("pause");  
94     return 0;  
95 }

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