flipcode进行图像简单反转实现-优快云博客

本文链接：https://blog.youkuaiyun.com/chenyanpeng2003/article/details/48860731

本文介绍了如何使用OpenCV库的flip函数来实现图像的垂直、水平或同时翻转。提供了C++和C语言的API，并通过一个简单的C++测试代码示例展示了如何读取图像并进行翻转操作。测试结果显示了不同flipCode参数值下的图像翻转效果，包括图像的垂直、水平和中心翻转。

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flip函数

Flips a 2D array around vertical, horizontal, or both axes.

C++: void flip(InputArraysrc, OutputArraydst, int flipCode)

C: void cvFlip(const CvArr*src, CvArr*dst=NULL, intflip_mode=0)

Parameters:

src - input array
dst - output array of the same size and type as src.
flipCode - a flag to specify how to flip the array; 0 means flipping around the x-axis and positive value (for example, 1) means flipping around y-axis. Negative value (for example, -1) means flipping around both axes (see the discussion below for the formulas).

The function flip flips the array in one of three different ways (row and column indices are 0-based):

The example scenarios of using the function are the following:

Vertical flipping of the image (flipCode==0) to switch between top-left and bottom-left image origin. This is a typical operation in video processing on Microsoft Windows* OS.
Horizontal flipping of the image with the subsequent horizontal shift and absolute difference calculation to check for a vertical-axis symmetry (flipCode>0).
Simultaneous horizontal and vertical flipping of the image with the subsequent shift and absolute difference calculation to check for a central symmetry (flipCode<0).
Reversing the order of point arrays (flipCode>0 orflipCode==0).

（上述对函数Flip描述来自 <<The OpenCV Reference Manual,Release2.4.3>> P.130-P.131）

测试代码：

[cpp]view plaincopyprint? 
   
 // CookbookMatImage.cpp : Defines the entry point for the console application.  
 // The cookbook: Computer Vision Programming using the OpenCV Library.  
 // by Robert Laganiere, Packt Publishing, 2011.  
 // Copyright (C) 2013-2015 Gavin Liu,  http://blog.youkuaiyun.com/songzitea  
   
 #include "stdafx.h"  
 #include "opencv2\core\core.hpp"  
 #include "opencv2\highgui\highgui.hpp"  
   
 int main(   )   
 {  
     cv::Mat image;  // create image  
         cv::Mat result;  
          
         image = cv::imread("monument.jpg");    // open image  
   
     // check if image has been successfully read  
     if (!image.data)    return 0;  
   
     cv:: cv::flip(image,result,1);  
     cv::namedWindow("Flip Image"); // define the window  
         cv::imshow("Flip Image", result); // display the Flip image  
       
     cv::waitKey(0); // wait for key pressed  
 }  