OpenCV——Skewing

// define head function

#ifndef PS_ALGORITHM_H_INCLUDED

#define PS_ALGORITHM_H_INCLUDED

#include <iostream>

#include <string>

#include "cv.h"

#include "highgui.h"

#include "cxmat.hpp"

#include "cxcore.hpp"

#include "math.h"

using namespace std;

using namespace cv;

void Show_Image(Mat&, const string &);

#endif // PS_ALGORITHM_H_INCLUDED

#include "PS_Algorithm.h"

#include <time.h>

using namespace std;

using namespace cv;

#define pi 3.1415926

int main()

{

    string Img_name("4.jpg");

    Mat Img;

    Img=imread(Img_name);

    float theta=pi/6;

    int width=Img.cols;

    int height=Img.rows;

    /*

    // horizontal skewing

    int new_height=height;

    int new_width=width+height*tan(theta)+1;

    Mat Img_H=Mat::zeros(new_height,new_width, CV_8UC3);

    float Dis;

    float new_x, new_y;

    float x1, y1, p;

    for (int y=0; y<new_height; y++)

    {

        Dis=(height-y)*tan(theta);

        for (int x=0; x<new_width; x++)

        {

            new_y=y;

           // right skew

           //  new_x=x-Dis;

           // left skew

             new_x=x+Dis-height*tan(theta);

          // if (new_x<0) new_x=0;

          // if (new_x>width-1) new_x=width-2;

          if (new_x>0 && new_x<width-1)

          {

                x1=int(new_x);

                y1=int(new_y);

                p=new_x-x1;

                Img_H.at<Vec3b>(y,x)[0]=(1-p)*Img.at<Vec3b>(y1,x1)[0]+p*Img.at<Vec3b>(y1,x1+1)[0];

                Img_H.at<Vec3b>(y,x)[1]=(1-p)*Img.at<Vec3b>(y1,x1)[1]+p*Img.at<Vec3b>(y1,x1+1)[1];

                Img_H.at<Vec3b>(y,x)[2]=(1-p)*Img.at<Vec3b>(y1,x1)[2]+p*Img.at<Vec3b>(y1,x1+1)[2];

          }

        }

    }

    Show_Image(Img_H, "out");

    imwrite("H.jpg", Img_H);

    */

    // vertical skewing

    int new_height=height+width*tan(theta)+1;

    int new_width=width;

    Mat Img_V=Mat::zeros(new_height,new_width, CV_8UC3);

    float Dis;

    float new_x, new_y;

    float x1, y1, p;

    for (int y=0; y<new_height; y++)

    {

        for (int x=0; x<new_width; x++)

        {

            Dis=x*tan(theta);

            new_x=x;

           // right skew

           new_y=y-Dis;

           // left skew

           //  new_y=y+Dis-width*tan(theta);

          if (new_y>0 && new_y<height-1)

          {

                x1=int(new_x);

                y1=int(new_y);

                p=new_y-y1;

                Img_V.at<Vec3b>(y,x)[0]=(1-p)*Img.at<Vec3b>(y1,x1)[0]+p*Img.at<Vec3b>(y1+1,x1)[0];

                Img_V.at<Vec3b>(y,x)[1]=(1-p)*Img.at<Vec3b>(y1,x1)[1]+p*Img.at<Vec3b>(y1+1,x1)[1];

                Img_V.at<Vec3b>(y,x)[2]=(1-p)*Img.at<Vec3b>(y1,x1)[2]+p*Img.at<Vec3b>(y1+1,x1)[2];

          }

        }

    }

    Show_Image(Img_V, "out");

    imwrite("V.jpg", Img_V);

    waitKey();

}

// define the show image

#include "PS_Algorithm.h"

#include <iostream>

#include <string>

using namespace std;

using namespace cv;

void Show_Image(Mat& Image, const string& str)

{

    namedWindow(str.c_str(),CV_WINDOW_AUTOSIZE);

    imshow(str.c_str(), Image);

}
原图
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巴特西

OpenCV——Skewing

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