C#+OpenCV基础(四)_旋转翻转透视

合集 - C#+机器视觉OpenCV(27)

1.C#+OpenCV学习笔记(目录)-目录2024-07-102.C#+OpenCV基础(一)_加载创建复制保存图片2024-07-103.C#+OpenCV基础(二)_灰度化二值化2024-07-104.C#+OpenCV基础(三)_修改高宽剪切拼接缩放2024-07-10

5.C#+OpenCV基础(四)_旋转翻转透视2024-07-10

6.C#+OpenCV基础(五)_添加边框2024-07-107.C#+OpenCV基础(六)_均值中值高斯双边滤波2024-07-108.C#+OpenCV基础(七)_图像金字塔2024-07-109.C#+OpenCV基础(八)_获取修改图片亮度2024-07-1010.C#+OpenCV基础(九)_拆分合并图层2024-07-1011.C#+OpenCV基础(十)_灰度变化与直方图2024-07-1012.C#+OpenCV基础(十一)_图片基础计算2024-07-1013.C#+OpenCV基础(十二)_图片形态学计算2024-07-1014.C#+OpenCV基础(十三)_图片白平衡矫正2024-07-1015.C#+OpenCV基础(十四)_绘制像素、图形、文字2024-07-1016.C#+OpenCV基础(十五)_图像的基础分割方法2024-07-1117.C#+OpenCV基础(十六)_识别圆、直线、斑点、轮廓2024-07-1118.C#+OpenCV基础(十七)_计算图片相似度2024-07-1119.C#+OpenCV基础(十八)_模版匹配2024-07-1120.C#+OpenCV进阶(一)_人体识别2024-07-1121.C#+OpenCV进阶(二)_文字识别2024-07-1122.C#+OpenCV进阶(三)_操作摄像头与视频文件2024-07-1123.C#+OpenCV进阶(四)_录屏2024-07-1124.C#+OpenCV实战(一)_图片简易角度矫正2024-07-1125.C#+OpenCV实战(二)_春天转秋天2024-07-1126.C#+OpenCV实战(三)_玉米粒计数2024-07-1127.C#+OpenCV实战(四)_特定钢板缺陷检测2024-07-11

收起

1、旋转

/// <summary>
/// 旋转图片
/// </summary>
/// <param name="mat">图片</param>
/// <param name="rotate">旋转方向</param>
/// <returns></returns>
public static Mat Rotate(Mat mat, RotateFlags rotate)
{
    Mat result = new Mat();
    Cv2.Rotate(mat, result, rotate);
    return result;
}

/// <summary>
/// 任意角度旋转图片
/// </summary>
/// <param name="mat">图片</param>
/// <param name="input">旋转矩阵;</param>
/// <param name="dsize">输出图片大小</param>
/// <param name="flags">像素插值方式</param>
/// <param name="borderMode">背景填充默认为常量</param>
/// <param name="borderValue">填充颜色默认为黑色</param>
/// <returns></returns>
public static Mat WarpAffine(Mat mat, InputArray input, Size dsize,
    InterpolationFlags flags = InterpolationFlags.Linear, BorderTypes borderMode = BorderTypes.Constant, Scalar? borderValue = null)
{
    Mat dst = new Mat();

    //Mat input = Cv2.GetRotationMatrix2D(new Point2f(mat.Cols/2f,mat.Rows/2f),45,0.6);
    Cv2.WarpAffine(mat, dst, input, dsize, flags, borderMode, borderValue);  // dsize=mat.Size()
    return dst;
}

2、翻转

/// <summary>
/// 翻转图片
/// </summary>
/// <param name="mat">图片</param>
/// <param name="flipCode">绕X/Y轴翻转</param>
/// <returns></returns>
public static Mat Flip(Mat mat, FlipMode flipCode)
{
    Mat result = new Mat();
    Cv2.Flip(mat, result, flipCode);
    return result;
}

3、透视

/// <summary>
/// 透视图片
/// </summary>
/// <param name="mat">图片</param>
/// <param name="srcPoints">源图像中的 三角形顶点坐标 Point2f[] srcPoints = new Point2f[]{ new Point2f(0,0), new Point2f(mat.Cols,0), new Point2f(0,mat.Rows)};</param>
/// <param name="dstPoints">目标图像中的 三角形顶点坐标 Point2f[] dstPoints = new Point2f[]{ new Point2f(mat.Cols *0.00f,mat.Rows*0.33f), new Point2f(mat.Cols *0.85f,mat.Rows*0.25f), new Point2f(mat.Cols *0.15f,mat.Rows*0.70f)};</param>
/// <returns></returns>
public static Mat GetAffineTransform(Mat mat, Point2f[] srcPoints, Point2f[] dstPoints)
{
    Mat dst = new Mat();

    //Point2f[] srcPoints = new Point2f[]
    //{
    //    new Point2f(0,0),
    //    new Point2f(mat.Cols,0),
    //    new Point2f(0,mat.Rows)
    //};

    //Point2f[] dstPoints = new Point2f[]
    //{
    //    new Point2f(mat.Cols *0.00f,mat.Rows*0.33f),
    //    new Point2f(mat.Cols *0.85f,mat.Rows*0.25f),
    //    new Point2f(mat.Cols *0.15f,mat.Rows*0.70f)
    //};

    Mat input = Cv2.GetAffineTransform(srcPoints, dstPoints);
    Cv2.WarpAffine(mat, dst, input, mat.Size());  // dsize=mat.Size()
    return dst;
}