C#+OpenCV基础(三)_修改高宽剪切拼接缩放

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2024-07-10

4.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2024-07-106.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、获取/设置图片高宽

 /// <summary>
 /// 获取图片宽高
 /// </summary>
 /// <param name="mat">图片</param>
 /// <returns></returns>
 public static (int w, int h) GetSize(Mat mat)
 {
     //Debug.WriteLine("宽：" + srcMat.Size().Width+",高："+ srcMat.Size().Height);
     //Debug.WriteLine("宽2：" + srcMat.Width + ",高2：" + srcMat.Height);
     //Debug.WriteLine("宽Rows：" + srcMat.Rows + ",高Cols：" + srcMat.Cols);

     (int w, int h) value;
     value.w = mat.Width;
     value.h = mat.Height;
     return value;
 }

 /// <summary>
 /// 调整图片宽高
 /// 缩放图片
 /// </summary>
 /// <param name="mat">图片</param>
 /// <returns></returns>
 public static Mat SetSize(Mat mat, int width, int height)
 {
     Mat result = new Mat();
     Cv2.Resize(mat, result, new OpenCvSharp.Size(width, height));
     return result;
 }

2、剪切

/// <summary>
/// 剪切图片
/// </summary>
/// <param name="mat">图片</param>
/// <param name="x">坐标x</param>
/// <param name="y">坐标y</param>
/// <param name="w">宽度</param>
/// <param name="h">高度</param>
/// <returns></returns>
public static Mat CutImage(Mat mat, int x, int y, int w, int h)
{
    // 设置区域
    Rect rect = new Rect(x, y, w, h);

    Mat dst = new Mat(mat, rect);  // 创建新图片
    return dst;
}

3、拼接

/// <summary>
/// 拼接图片
/// </summary>
/// <param name="mats">图片集</param>
/// <param name="isH">是否是纵向拼接；true=纵向拼接,false=横向拼接</param>
/// <returns></returns>
public static Mat Concat(Mat[] mats, bool isV)
{
    Mat dst = new Mat();

    if (isV)
    {
        Cv2.VConcat(mats, dst);
    }
    else
    {
        Cv2.HConcat(mats, dst);
    }
    return dst;
}

4、缩放(压缩)

/// <summary>
/// 压缩图片
/// </summary>
/// <param name="mat">图片</param>
/// <param name="multiple">高与宽的压缩倍数；默认是2倍</param>
/// <returns></returns>
public static Mat CompressTo(Mat mat, int multiple = 2)
{
    // 创建压缩图片
    Mat result = new Mat();
    //压缩
    Cv2.Resize(mat, result, new OpenCvSharp.Size(mat.Cols / multiple, mat.Rows / multiple));
    return result;
}