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You can refer to OpenCV samples. Many samples use this such concept. Here is one from \opencv\sources\samples\cpp\stereo_calib.cpp.

1. Create a text file with list of image names along with path to be processed.

2. Following code opens the text file and prepares the list of file names.

   FILE* f = fopen("ImageList.txt", "r");
   vector<string> imagelist;
   for(int i = 0; ; i++)
   {
   if(!fgets(buf, sizeof(buf)-3, f))
       break;
   size_t len = strlen(buf);
   
   while(len > 0 && isspace(buf[len-1]))
       buf[--len] = '\0';
   
   if(buf[0] == '#')
       continue;
   
   imagelist.push_back(buf);
   }
   fclose(f);
   

3. Start accessing images by imread(imagelist[i])