opencv一个窗口显示多幅图像

前一段时间看了yang_xian521写了一篇用opencv在一个窗口中显示多幅图像的博文，感觉非常不错。以前在很长一段时间内，都只是用Matlab显示多幅图像。遗憾的是，opencv没有集成这样的功能。今天我将该作者的博文转载过来，供大家共同学习。转载地址为：http://blog.csdn.net/yang_xian521/article/details/7915396

作者主要写了一个显示多幅图像的函数，但该函数最多只能显示12幅图像。

开发环境为VC6.0、OpenCv1.0源代码如下：

 

#include <cv.h>
#include <highgui.h>

#include <stdio.h>
#include <stdarg.h>	//输入可变参数个数
#include <time.h>
#include <iostream>

//显示多幅图像
void cvShowManyImages(char* title, int nArgs, ...) 
{
	IplImage *img;	// img - Used for getting the arguments
	IplImage *DispImage;	// DispImage - the image in which input images are to be copied
	int size;
	int i;
	int m, n;
	int x, y;
	int w, h;	//w: 每行最多的窗口个数, h: 每列最多的窗口个数

	// scale - How much we have to resize the image
	float scale;
	int max;

	// 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)//	显示1幅图像,每行每列只有一幅图像
	{
		w = h = 1;
		size = 400;
	}
	else if (nArgs == 2)//显示2幅图像, 每行两幅图像，每列1幅图像，即1行2列
	{
		w = 2; h = 1;
		size = 400;
	}
	else if (nArgs == 3 || nArgs == 4) //显示3或4副图像，2X2列
	{
		w = 2; h = 2;
		size = 350;
	}
	else if (nArgs == 5 || nArgs == 6) //显示5或6幅图像，3X2列
	{
		w = 3; h = 2;
		size = 200;
	}
	else if (nArgs == 7 || nArgs == 8)	//显示7或8幅图像，4X2列
	{
		w = 4; h = 2;
		size = 200;
	}
	else	//	大于8幅，小于13幅图像时，4X3列
	{
		w = 4; h = 3;
		size = 150;
	}

	// 创建一个3通道的图像
	DispImage = cvCreateImage( cvSize( 60 + size*w, 60 + size*h), 8, 3 );	//cvSize( 100+ size*w, 60 + size*h)

	// Used to get the arguments passed
	va_list args;
	va_start(args, nArgs);

	// Loop for nArgs number of arguments
	for (i = 0, m = 10, n = 10; i < nArgs; i++, m += (10 + size)) 
	{
		// Get the Pointer to the IplImage
		img = va_arg(args, IplImage*);
		if(img == 0)
		{
			printf("Invalid arguments");
			cvReleaseImage(&DispImage);
			return;
		}

		// Find the width and height of the image
		x = img->width;
		y = img->height;

		// Find whether height or width is greater in order to resize the image
		max = (x > y)? x: y;

		// 图像的尺度
		scale = (float) ( (float) max / size );

		// Used to Align the images
		if( i % w == 0 && m!= 10)
		{
			m = 10;
			n = size-100;
			//n+= size;
		}
		// Set the image ROI to display the current image
		cvSetImageROI(DispImage, cvRect(m, n, (int)( x/scale ), (int)( y/scale )));

		// 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
	cvShowImage( title, DispImage);

	// End the number of arguments
	va_end(args);

	// Release the Image Memory
	cvReleaseImage(&DispImage);
}
int main(int argc,char **argv) 
{
	int i=0;
	IplImage *frame=cvLoadImage("4444.jpg");
	cvNamedWindow("video",1);
	cvResizeWindow("video",2000,1000);

	IplImage *frame_not=cvCreateImage(cvGetSize(frame),frame->depth,frame->nChannels);
	cvNot(frame,frame_not);		//图像取反

	IplImage *frame_gray=cvCreateImage(cvGetSize(frame),frame->depth,1);
	IplImage *frame1=cvCreateImage(cvGetSize(frame),frame->depth,frame->nChannels);
	IplImage *frame_canny=cvCreateImage(cvGetSize(frame),frame->depth,1);
	IplImage *frame2=cvCreateImage(cvGetSize(frame),frame->depth,frame->nChannels);
	cvCvtColor(frame,frame_gray,CV_RGB2GRAY);
	cvCvtColor(frame_gray,frame1,CV_GRAY2BGR);
	cvCanny(frame_gray,frame_canny,20,75,3);
	cvCvtColor(frame_canny,frame2,CV_GRAY2BGR);

	cvShowManyImages("video",4,frame,frame_not,frame1,frame2);
	cvWaitKey(0);

	cvReleaseImage(&frame_not);
	cvReleaseImage(&frame1);
	cvReleaseImage(&frame_gray);
	cvReleaseImage(&frame2);
	cvReleaseImage(&frame_canny);

	cvDestroyWindow("video");

	return 0;
}

显示结果为：

注意：

这里用到了输入可变参数个数的函数，其中头文件#include <stdarg.h> 可以使得输入参数的个数可变。