透视变换--基于getPerspectiveTransform()及像素赋值（未涉及插值）_getperspectivetransform()源码

好久没写博客了，因为白天要去实习，晚上看论文实在抽不出时间，由于项目需要，研究了透视变换，在网上找了一圈不是缺腿就是少胳膊的，后来对缺省的代码进行补充使其可以调通，现贴出来供大家学习使用，代码如下：

 
 

   
   

    
    

   
   
   
   

    
    

     
     #include<iostream>
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     #include<opencv2/highgui/highgui.hpp>
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     #include<opencv2/imgproc/imgproc.hpp>
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     using 
     
     namespace cv;
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     using 
     
     namespace 
     
     std;
    
    
   
   

   
   

    
    

   
   
   
   

    
    
 
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     int main( )  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     {  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         Mat img=imread(
     
     "1.jpg");  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     int img_height = img.rows;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     int img_width = img.cols;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     vector<Point2f> corners(
     
     4);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners[
     
     0] = Point2f(
     
     0,
     
     0);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners[
     
     1] = Point2f(img_width
     
     -1,
     
     0);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners[
     
     2] = Point2f(
     
     0,img_height
     
     -1);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners[
     
     3] = Point2f(img_width
     
     -1,img_height
     
     -1);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     vector<Point2f> corners_trans(
     
     4);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners_trans[
     
     0] = Point2f(
     
     150,
     
     250);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners_trans[
     
     1] = Point2f(
     
     771,
     
     0);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners_trans[
     
     2] = Point2f(
     
     0,img_height
     
     -1);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         corners_trans[
     
     3] = Point2f(
     
     650,img_height
     
     -1);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         Mat transform = getPerspectiveTransform(corners,corners_trans);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     cout<<transform<<
     
     endl;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     vector<Point2f> ponits, points_trans;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     for(
     
     int i=
     
     0;i<img_height;i++){  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
        
     
     for(
     
     int j=
     
     0;j<img_width;j++){  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
                 ponits.push_back(Point2f(j,i));  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
             }  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         }  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         perspectiveTransform( ponits, points_trans, transform);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         Mat img_trans = Mat::zeros(img_height,img_width,CV_8UC3);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     int count = 
     
     0;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     for(
     
     int i=
     
     0;i<img_height;i++){  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
             uchar* p = img.ptr<uchar>(i);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
        
     
     for(
     
     int j=
     
     0;j<img_width;j++){  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
            
     
     int y = points_trans[count].y;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    
            
     
     int x = points_trans[count].x;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
                 uchar* t = img_trans.ptr<uchar>(y);  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
                 t[x*
     
     3]  = p[j*
     
     3];  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
                 t[x*
     
     3+
     
     1]  = p[j*
     
     3+
     
     1];  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
                 t[x*
     
     3+
     
     2]  = p[j*
     
     3+
     
     2];  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
                 count++;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
             }  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         }  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
         imwrite(
     
     "1_trans.jpg",img_trans); 
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     	namedWindow(
     
     "原图");
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     	imshow(
     
     "原图", img);
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     	namedWindow(
     
     "透视变换图");
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     	imshow(
     
     "透视变换图", img_trans);
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     	waitKey(
     
     0);
    
    
   
   

   
   

    
    

   
   
   
   

    
    
    
     
     return 
     
     0;  
    
    
   
   

   
   

    
    

   
   
   
   

    
    

     
     }  
    
    
   
   
 
 
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透视变换之后的效果图：

转载自：https://blog.csdn.net/llx1026/article/details/78289247