OpenCV 90°旋转-CFANZ编程社区

OpenCV 90°旋转

顺时针旋转90°思路

原始图像像素矩阵2行2列：

| 1 | 2 |   
---------

| 1 | 2 |     T        | 1 | 3 |     Y轴镜像    | 3 | 1 |
---------   ------->   ---------   ------->    ---------
| 3 | 4 |              | 2 | 4 |               | 4 | 2 |

逆时针旋转90°思路

| 1 | 2 |     T        | 1 | 3 |     X轴镜像    | 2 | 4 |
---------   ------->   ---------    ------->   ---------
| 3 | 4 |              | 2 | 4 |               | 1 | 3 |

OpenCV代码

#include <iostream>
#include <string>
#include <vector>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace std;
using namespace cv;

void myRotateClockWise90(Mat &src)
{
    if (src.empty())
    {
        return;
    }
    // 矩阵转置
    transpose(src, src); 
    //0: 沿X轴翻转； >0: 沿Y轴翻转； <0: 沿X轴和Y轴翻转
    flip(src, src, 1);
}


void myRotateAntiClockWise90(Mat &src)
{
    if (src.empty())
    {
        return;
    }
    transpose(src, src);
    flip(src, src, 0);
}


int main(int argc, char* argv[])
{
    const string imgpath = "D:/opencv.jpg";
    Mat src = imread(imgpath, 1);
    Mat srcT;
    transpose(src, srcT);
    imwrite("D:/opencvT.jpg", srcT);

    Mat srcClockWise90 = src.clone();
    myRotateClockWise90(srcClockWise90);
    imwrite("D:/opencvCW90.jpg", srcClockWise90);

    Mat srcAntiClockWise90 = src.clone();
    myRotateAntiClockWise90(srcAntiClockWise90);
    imwrite("D:/opencvACW90.jpg", srcAntiClockWise90);
    return 0;
}