CombinationImages.cpp

//============================================================================
// Name        : CombinationImages.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

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

using namespace cv;
using namespace std;

int cv_output_tangenbetu_file(InputArray src, char* fileName);

int main(int argc, char** argv) {
	//Mat jpeg1, jpeg2;

	int img_num = argc > 1 ? argc - 1 : 2;
	vector<Mat> src_img;
	int total_height;
	int width;
	for (int i = 0; i < img_num; i++) {
		src_img.push_back(imread(argv[i + 1], 1));
		Mat last = src_img.back();
		total_height += last.rows;　←縦に連結する場合。横の場合は、widthを足していけばOK。
		width = last.cols;
	}

	Mat combined_img(Size(width, total_height), CV_8UC3);

	vector<Mat>::iterator it = src_img.begin(), it_end = src_img.end();
	Rect roi_rect;
	int cnt = 0;
	for (; it != it_end; ++it) {
		roi_rect.width = it->cols;
		roi_rect.height = it->rows;

		Mat roi(combined_img, roi_rect);
		it->copyTo(roi);
		roi_rect.y += it->rows; 　←縦に連結する場合。横の場合は、x座標を操作すればOK。

		cnt++;
	}


        // 表示したい場合は以下を有効に。    
	//namedWindow("combined images", CV_WINDOW_NORMAL);
	//imshow("Display combined images", combined_img);

	cv_output_tangenbetu_file(combined_img, <出力したいファイル名>);

	waitKey(0);

	return 0;
}

/**
 * ファイルに書き出す
 */
int cv_output_tangenbetu_file(InputArray src, char* fileName) {
	const string file = fileName;

	vector<int> params(2);

	// 品質(0-100) defalt:95
	params[0] = CV_IMWRITE_JPEG_QUALITY;
	params[1] = 100;
	imwrite(file, src, params);

	return 0;
}