Qt-OpenCV学习笔记--透视变换--warpPerspective()

概述

这个函数用来对图像进行 透视变换 。

函数

void cv::warpPerspective
(
	InputArray 	  src,
    OutputArray   dst,
    InputArray    M,
    Size 	dsize,
    int 	flags = INTER_LINEAR,
    int 	borderMode = BORDER_CONSTANT,
    const Scalar & 	borderValue = Scalar() 
)		

测试代码

#include "widget.h"
#include "ui_widget.h"
 
#include <QDebug>
 
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
 
using namespace cv;
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
 
    //载入图像
    Mat src = imread("c:/opencv/666.jpg");
    //显示
    imshow("src",src);
 
    //定义4个点
    Point2f ps_src[4];
    Point2f ps_dst[4];
 
    ps_src[0] = Point2f(0,0);
    ps_src[1] = Point2f(src.size().width-1 , 0);
    ps_src[2] = Point2f(src.size().width-1 , src.size().height-1);
    ps_src[3] = Point2f(0 , src.size().height-1);
 
    ps_dst[0] = Point2f(src.size().width*0.25 , src.size().height*0.20);
    ps_dst[1] = Point2f(src.size().width*0.75 , src.size().height*0.20);
    ps_dst[2] = Point2f(src.size().width*0.85 , src.size().height*0.85);
    ps_dst[3] = Point2f(src.size().width*0.15 , src.size().height*0.85);
 
    //获取变换矩阵
    Mat M = getPerspectiveTransform(ps_src,ps_dst);
 
    //定义输出图像
    Mat dst;
 
    //运算
    warpPerspective(src,dst,M,src.size());
 
    //显示
    imshow("dst",dst);
 
 
}
 
Widget::~Widget()
{
    delete ui;
}

测试结果

参考

Opencv学习（15）—warpPerspective()