Opencv cvShowMultiImages 函数

#include "stdafx.h" #include <stdarg.h> // va_list, va_start, va_arg, va_end  #include <cv.h> #include <highgui.h> #include <cxcore.h> #include <iostream> using namespace std; void cvShowMultiImages(char* title,int nChannels, int nArgs, ...)  {     // img - Used for getting the arguments      IplImage* img;      // DispImage - the image in which all the input images are to be copied     IplImage* DispImage;      int size_r,size_c;    // size - the size of the images in the window     int ind;        // ind - the index of the image shown in the window     int x_c, y_r;    // x_c,y_r - the coordinate of top left coner of input images     int w, h;    // w,h - the width and height of the image      // r - Maximum number of images in a column      // c - Maximum number of images in a row      int r, c;      // space - the spacing between images     int space_r,space_c;      // If the number of arguments is lesser than 0 or greater than 12     // return without displaying      if(nArgs <= 0) {         printf("Number of arguments too small..../n");         return;     }     else if(nArgs > 12) {         printf("Number of arguments too large..../n");         return;     }     // Determine the size of the image,      // and the number of rows/cols      // from number of arguments      else if (nArgs == 1) {         r = c = 1;         size_r = 480; size_c = 640 ;      }     else if (nArgs == 2) { // x_c = size_row y_r=size_col         r = 1; c = 2;         // size_r = 705; size_c = 350 ; // specail set for show the full story of lena         size_r = 405; size_c = 540 ;      }     else if ( nArgs == 3 || nArgs == 4) {         r = 2; c = 2;         size_r = 405; size_c =540 ;      }     else if (nArgs == 5 || nArgs == 6) {         r = 2; c = 3;         size_r = 360; size_c = 480;     }     else if (nArgs == 7 || nArgs == 8) {         r = 2; c = 4;         size_r = 200; size_c = 240;     }     else {         r = 3; c = 4;         size_r = 150; size_c = 200;      }      // Create a new 3 channel image to show all the input images      // cvSize(width,height)=(col,row)=(y_r,x_c)      DispImage = cvCreateImage( cvSize(30 + size_c*c,40 + size_r*r), IPL_DEPTH_8U, nChannels );      // Used to get the arguments passed     va_list args;     va_start(args, nArgs); // stdarg.h      // Loop for nArgs number of arguments     space_r = 40/(r+1);     space_c = 30/(c+1);     for (ind = 0, x_c = space_c, y_r = space_r; ind < nArgs; ind++, x_c += (space_c + size_c)) {          // Get the Pointer to the IplImage         img = va_arg(args, IplImage*);  // stdarg.h          // Check whether it is NULL or not         // If it is NULL, release the image, and return         if(img == 0) {             printf("Invalid arguments");             cvReleaseImage(&DispImage);             return;         }          // Find the width and height of the image         w = img->width;         h = img->height;          // Used to Align the images         // i.e. Align the image to next row e.g.r=1,c=2, this row is end , we have ind%c==0 ,         // then we move to the next row,even the next row can't through the cond  ind < nArgs         if( ind % c == 0 && x_c!= space_c) {             x_c  = space_c;             y_r += space_r + size_r;         }          // Set the image ROI to display the current image         cvSetImageROI(DispImage, cvRect(x_c, y_r, size_c, size_r));         //cvSetImageROI(DispImage, cvRect(x_c, y_r, (int)( w/scale_x ), (int)( h/scale_y )));          // Resize the input image and copy the it to the Single Big Image         cvResize(img, DispImage);          // Reset the ROI in order to display the next image         cvResetImageROI(DispImage);     }      // Create a new window, and show the Single Big Image     cvNamedWindow( title, 1 );     cvShowImage( title, DispImage);     cvWaitKey(0);     // End the number of arguments     va_end(args);      // Release the Image Memory     cvReleaseImage(&DispImage); }  int main( int argc, char** argv ) {    IplImage* src1 = cvLoadImage("1002.png" );     IplImage* src2 = cvLoadImage("1002.png" );    IplImage* src3 = cvLoadImage("1002.png" );    IplImage* src4 = cvLoadImage("1002.png" );  cvShowMultiImages("1",3,4,src1,src2,src3,src4); 	system("pause"); 	return 0; }