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/**
* @function Geometric_Transforms_Demo.cpp
* @brief Demo code for Geometric Transforms
* @author OpenCV team
*/
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include <iostream>
using namespace cv;
using namespace std;
/**
* @function main
*/
int main( int argc, char** argv )
{
//! [Load the image]
CommandLineParser parser( argc, argv, "{@input | lena.jpg | input image}" );
Mat src = imread( samples::findFile( parser.get<String>( "@input" ) ) );
if( src.empty() )
{
cout << "Could not open or find the image!\n" << endl;
cout << "Usage: " << argv[0] << " <Input image>" << endl;
return -1;
}
//! [Load the image]
//! [Set your 3 points to calculate the Affine Transform]
Point2f srcTri[3];
srcTri[0] = Point2f( 0.f, 0.f );
srcTri[1] = Point2f( src.cols - 1.f, 0.f );
srcTri[2] = Point2f( 0.f, src.rows - 1.f );
Point2f dstTri[3];
dstTri[0] = Point2f( 0.f, src.rows*0.33f );
dstTri[1] = Point2f( src.cols*0.85f, src.rows*0.25f );
dstTri[2] = Point2f( src.cols*0.15f, src.rows*0.7f );
//! [Set your 3 points to calculate the Affine Transform]
//! [Get the Affine Transform]
Mat warp_mat = getAffineTransform( srcTri, dstTri );
//! [Get the Affine Transform]
//! [Apply the Affine Transform just found to the src image]
/// Set the dst image the same type and size as src
Mat warp_dst = Mat::zeros( src.rows, src.cols, src.type() );
warpAffine( src, warp_dst, warp_mat, warp_dst.size() );
//! [Apply the Affine Transform just found to the src image]
/** Rotating the image after Warp */
//! [Compute a rotation matrix with respect to the center of the image]
Point center = Point( warp_dst.cols/2, warp_dst.rows/2 );
double angle = -50.0;
double scale = 0.6;
//! [Compute a rotation matrix with respect to the center of the image]
//! [Get the rotation matrix with the specifications above]
Mat rot_mat = getRotationMatrix2D( center, angle, scale );
//! [Get the rotation matrix with the specifications above]
//! [Rotate the warped image]
Mat warp_rotate_dst;
warpAffine( warp_dst, warp_rotate_dst, rot_mat, warp_dst.size() );
//! [Rotate the warped image]
//! [Show what you got]
imshow( "Source image", src );
imshow( "Warp", warp_dst );
imshow( "Warp + Rotate", warp_rotate_dst );
//! [Show what you got]
//! [Wait until user exits the program]
waitKey();
//! [Wait until user exits the program]
return 0;
}
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