void OpenCV_Function::warpAffine() {
//【1】参数准备
//定义两组点，代表两个三角形
cv::Point2f srcTriangle[3];
cv::Point2f dstTriangle[3];
//定义一些Mat变量
cv::Mat rotMat( 2, 3, CV_32FC1 );
cv::Mat warpMat( 2, 3, CV_32FC1 );
//【2】加载源图像并作一些初始化
g_srcImage=cv::imread("girl-t1.jpg");
// 设置目标图像的大小和类型与源图像一致
g_resultImage = cv::Mat::zeros( g_srcImage.rows, g_srcImage.cols, g_srcImage.type() );
//【3】设置源图像和目标图像上的三组点以计算仿射变换
srcTriangle[0] = cv::Point2f( 0,0 );
srcTriangle[1] = cv::Point2f( static_cast<float>(g_srcImage.cols - 1), 0 );
srcTriangle[2] = cv::Point2f( 0, static_cast<float>(g_srcImage.rows - 1 ));
dstTriangle[0] = cv::Point2f( static_cast<float>(g_srcImage.cols*0.0), static_cast<float>(g_srcImage.rows*0.33));
dstTriangle[1] = cv::Point2f( static_cast<float>(g_srcImage.cols*0.65), static_cast<float>(g_srcImage.rows*0.35));
dstTriangle[2] = cv::Point2f( static_cast<float>(g_srcImage.cols*0.15), static_cast<float>(g_srcImage.rows*0.6));
//【4】求得仿射变换
warpMat = getAffineTransform( srcTriangle, dstTriangle );
//【5】对源图像应用刚刚求得的仿射变换
cv::warpAffine( g_srcImage, g_resultImage, warpMat, g_resultImage.size() );
//【6】对图像进行缩放后再旋转
cv::Point center = cv::Point( g_srcImage.cols/2, g_srcImage.rows/2 );
double angle = -20.0;
double scale = 1;
// 通过上面的旋转细节信息求得旋转矩阵
rotMat =cv::getRotationMatrix2D( center, angle, scale );
// 旋转已缩放后的图像
cv::warpAffine( g_resultImage, g_templateImage, rotMat, g_resultImage.size() );
cv::imshow("【原始图】",g_srcImage);
cv::imshow( "g_templateImage", g_templateImage );
cv::imshow( "g_resultImage", g_resultImage );
}
PERF_TEST_P( TestWarpPerspective, WarpPerspective,
Combine(
Values( szVGA, sz720p, sz1080p ),
InterType::all(),
BorderMode::all()
)
)
{
Size sz, szSrc(512, 512);
int borderMode, interType;
sz = get<0>(GetParam());
interType = get<1>(GetParam());
borderMode = get<2>(GetParam());
Scalar borderColor = Scalar::all(150);
Mat src(szSrc,CV_8UC4), dst(sz, CV_8UC4);
cvtest::fillGradient(src);
if(borderMode == BORDER_CONSTANT) cvtest::smoothBorder(src, borderColor, 1);
Mat rotMat = getRotationMatrix2D(Point2f(src.cols/2.f, src.rows/2.f), 30., 2.2);
Mat warpMat(3, 3, CV_64FC1);
for(int r=0; r<2; r++)
for(int c=0; c<3; c++)
warpMat.at<double>(r, c) = rotMat.at<double>(r, c);
warpMat.at<double>(2, 0) = .3/sz.width;
warpMat.at<double>(2, 1) = .3/sz.height;
warpMat.at<double>(2, 2) = 1;
declare.in(src).out(dst);
TEST_CYCLE() warpPerspective( src, dst, warpMat, sz, interType, borderMode, borderColor );
#ifdef __ANDROID__
SANITY_CHECK(dst, interType==INTER_LINEAR? 5 : 10);
#else
SANITY_CHECK(dst, 1);
#endif
}
