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;
}