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;}