2021-05-25

#include <opencv2/opencv.hpp> 
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/highgui/highgui.hpp>
using namespace cv;   
using namespace std;

#define WINDOW_NAME "【程序窗口】"
Mat g_srcImage, g_dstImage, g_tmpImage;
//static void ShowHelpText();


/*int main()
{
	Mat srcImage = imread("1.jpg");
	Mat tmpImage, dstImage1, dstImage2;
	tmpImage = srcImage;

	imshow("initial picture", srcImage);

	resize(tmpImage, dstImage1, Size(tmpImage.cols / 2, tmpImage.rows / 2), (0, 0), (0, 0), 3);
	resize(tmpImage, dstImage2, Size(tmpImage.cols * 2, tmpImage.rows * 2), (0, 0), (0, 0), 3);

	imshow("suoxiao", dstImage1);
	imshow("fangda", dstImage2);

	waitKey(0);
	return 0;                                                                                                                                                                   
}*/

//向下采样
/*int main()
{
	Mat srcImage = imread("1.jpg");
	Mat tmpImage, dstImage;
	tmpImage = srcImage;

	imshow("initial picture", srcImage);
	pyrDown(tmpImage, dstImage, Size(tmpImage.cols / 2, tmpImage.rows / 2));//向下
	pyrUp(tmpImage, dstImage, Size(tmpImage.cols / 2, tmpImage.rows / 2));//向上
	imshow("xiangxiacaiyang", dstImage);

	waitKey(0);
	return 0;
}*/

static void ShowHelpText()
{
	printf("\n\t图像金字塔和resize实例程序\n\t");
	printf("\t\t按键a基于pyrUp放大\n"
		"\t\t按键b基于pyrDown缩小\n"
		"\t\t按键c基于resize放大\n"
		"\t\t按键d基于resize缩小\n"
	);
}


int main()
{
	system("color 2F");

	ShowHelpText();

	g_srcImage = imread("1.jpg");
	if (!g_srcImage.data)
	{
		printf("Oh,imread error \n");
		return false;
	}

	namedWindow(WINDOW_NAME, WINDOW_AUTOSIZE);
	imshow(WINDOW_NAME, g_srcImage);

	g_tmpImage = g_srcImage;
	g_dstImage = g_tmpImage;

	int key = 0;

	while (1)
	{
		key = waitKey(9);

		switch (key)
		{
		case 27:
			return 0;
			break;

		case 'q':
			return 0;
			break;
		case'a':
			pyrUp(g_tmpImage, g_dstImage, Size(g_tmpImage.cols * 2, g_tmpImage.rows * 2));//向上
			printf("a,放大\n");
			break;
		case'b':
			pyrDown(g_tmpImage, g_dstImage, Size(g_tmpImage.cols / 2, g_tmpImage.rows / 2));//向上
			printf("b,缩小\n");
			break;

		case'c':
			resize(g_tmpImage, g_dstImage, Size(g_tmpImage.cols * 2, g_tmpImage.rows * 2), (0, 0), (0, 0), 3);
			printf("c,放大\n");
			break;
		case'd':
			resize(g_tmpImage, g_dstImage, Size(g_tmpImage.cols / 2, g_tmpImage.rows / 2), (0, 0), (0, 0), 3);
			printf("d,缩小\n");
			break;

		}
		imshow("xiangxiacaiyang",g_dstImage);
		g_tmpImage = g_dstImage;
	
	}
}