OpenCV仿射变换的示例代码

void warpAffine(InputArray src,OutputArray dst,InputArray M,Size dsize,int flags=INTER_LINEAR,intborderMOde=BODER_CONSTANT,const Scalar& borderValue=Scalar())

Mat getRotationMatrix2D(Point2f center,double angle,double scale)

#include<opencv2/opencv.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<iostream>
using namespace std;
using namespace cv;
#define WINDOW_NAME1 "【原始图窗口】"
#define WINDOW_NAME2 "【经过Warp后的窗口】"
#define WINDOW_NAME3 "【经过Warp和Rotate后的窗口】"
int main()
{
	system("color 2F");
	//参数准备
	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;
	//加载源图像
	srcImage = imread("E:\\Pec\\lan.jpg",1);
	//设置目标图像的大小和类型与源图像一致
	dstImage_warp = Mat::zeros(srcImage.rows, srcImage.cols, srcImage.type());
	//设置源图像和目标图像上的三组点以计算仿射变换
	//srcTriangle[0] = Point2f(0, 0); //Point2f表示Point类的两个数据x,y为float类型；vector 表示存放四维int
	//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));
	//获取变换矩阵，指定三个点
	srcTriangle[0] = Point2f(50, 50); 
	srcTriangle[1] = Point2f(200, 50);
	srcTriangle[2] = Point2f(50, 200);
	dstTriangle[0] = Point2f(100, 100);
	dstTriangle[1] = Point2f(200, 50);
	dstTriangle[2] = Point2f(100, 250);
	//求仿射变换,得到一个2x3的矩阵
	warpMat = getAffineTransform(srcTriangle, dstTriangle);
	//对源图像应用刚刚的求得的仿射变换
	warpAffine(srcImage, dstImage_warp, warpMat, dstImage_warp.size());

	//对图像进行缩放后再旋转
	//计算图像中点顺时针旋转50°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;
	//通过上面的旋转细节信息求出旋转矩阵
	rotMat = getRotationMatrix2D(center, angle, scale);
	//旋转已经缩放后的图像
	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;

}