仿射变换

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

#define WINDOW_NAME1 "【原始图窗口】"
#define WINDOW_NAME2 "【经过Warp后的图像】"
#define WINDOW_NAME3 "【经过Warp和Rotate后的图像】"

static void ShowHelpText();


int main()
{
	system("color 1A");
	//ShowHelpText();

	//两个三角形
	Point2f srcTriangle[3];
	Point2f dstTriangle[3];

	Mat rotMat(2, 3, CV_32FC1);
	Mat warpMat(2, 3, CV_32FC1);
	Mat srcImage, dstImage_warp, dstImage_warp_rotate;

	srcImage = imread("C:/Users/hasee-pc/Desktop/girl.jpg",1);

	//目标图和原图一样大小
	dstImage_warp = Mat::zeros(srcImage.rows, srcImage.cols,srcImage.type());

	//原图像和目标图像上的三组点以计算放射变换
	srcTriangle[0] = Point2f(0, 0);
	srcTriangle[1] = Point2f(static_cast<float>(srcImage.cols - 1), 0);
	srcTriangle[2] = Point2f(0, static_cast<float>(srcImage.rows - 1));
	
	dstTriangle[0] = Point2f(static_cast<float>(srcImage.cols*0.0), static_cast<float>(srcImage.rows - 0.33));
	dstTriangle[1] = Point2f(static_cast<float>(srcImage.cols*0.65), static_cast<float>(srcImage.rows*0.35));
	dstTriangle[2] = Point2f(static_cast<float>(srcImage.cols*0.15), static_cast<float>(srcImage.rows*0.6));

	//求得放射变换
	warpMat = getAffineTransform(srcTriangle, dstTriangle);

	//对原图像应用放射变换
	warpAffine(srcImage, dstImage_warp, warpMat, dstImage_warp.size());
	
	//对图像进行缩放后旋转
	//计算绕图像中点顺时针旋转50度缩放因子为0.6的旋转矩阵
	Point center = Point(dstImage_warp.cols / 2, dstImage_warp.rows / 2);
	double angle = -30.0;
	double scale = 0.8;

	//如上旋转细节信息求得旋转矩阵
	rotMat = getRotationMatrix2D(center, angle, scale);

	//旋转缩放后的图像
	warpAffine(dstImage_warp, dstImage_warp_rotate, rotMat, dstImage_warp.size());

	imshow(WINDOW_NAME1, srcImage);
	imshow(WINDOW_NAME2, dstImage_warp);
	imshow(WINDOW_NAME3, dstImage_warp_rotate);

	waitKey(0);
	return 0;
}