本文测试环境：

win10  64位

vistual studio 2019  

Emgu CV 4.6.0

环境配置准备：

1 新增控制台项目，.net framework为4.7.2

2  把win-x64目录的native目录下的文件全部拷贝到项目的运行目录Debug目录下

3  项目选择x64

4 添加项目引用Emgu.CV.dll、Emgu.CV.Platform.NetFramework.dll、System.Drawing.dll和System.Runtime.InteropServices.RuntimeInformation.dll  

具体配置参考：

Emgu CV4图像处理之环境搭建1(C#)_zxy2847225301的博客-CSDN博客

下面内容部分参考自：

EmguCV-第11讲-ROI与mask掩码_YADONCHEN的博客-CSDN博客_emgucv 掩模

【OpenCV学习笔记】十三、ROI与mask掩码_zlm丶的博客-CSDN博客_mask掩码

ROI：个人理解是，从原图中，截取指定矩形区域的内容

 

代码例子：

chunfen1.png原图

Logo.png原图

 

 

using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.Util;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EmguCVDemo2
{
    class Program
    {
        static void Main(string[] args)
        {

            Mat srcPic = new Mat("chunfen1.png");
            Mat logo = new Mat("Logo.png");
            ROITest(srcPic, logo);

            CvInvoke.WaitKey(0);
            Console.ReadLine();
        }


        private static void ROITest(Mat srcPic, Mat logo)
        {
            Mat imgROI = new Mat(srcPic, new System.Drawing.Rectangle(20, 20, logo.Cols, logo.Rows));
            CvInvoke.Imshow("imgROI", imgROI);
            CvInvoke.WaitKey(0);
        }
    }
}

 运行结果如下：

 

mask遮罩

 

初级融入：个人理解是，把一张小的图片(一般为Logo图片)，原封不动地替换到原图ROI对应的位置

代码如下：

using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.Util;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EmguCVDemo2
{
    class Program
    {
        static void Main(string[] args)
        {

            Mat srcPic = new Mat("chunfen1.png");
            Mat logo = new Mat("Logo.png");       
            PrimaryROI(srcPic, logo);
            CvInvoke.WaitKey(0);
            Console.ReadLine();
        }


       
        /// <summary>
        /// 初级融合
        /// </summary>
        /// <param name="srcPic"></param>
        /// <param name="logo"></param>
        public static void PrimaryROI(Mat srcPic,Mat logo)
        {
            Mat imgROI = new Mat(srcPic, new System.Drawing.Rectangle(20, 20, logo.Cols, logo.Rows));
            logo.CopyTo(imgROI);
            CvInvoke.Imshow("srcPic", srcPic);
            CvInvoke.WaitKey(0);
        }

        
    }
}

 运行结果如下图：

看到没有，把Logo图塞进原来ROI的位置了

圆形融合：个人理解是把遮罩的形状变成圆形，看起来圆滑一点

代码如下：

using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.Util;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EmguCVDemo2
{
    class Program
    {
        static void Main(string[] args)
        {

            Mat srcPic = new Mat("chunfen1.png");
            Mat logo = new Mat("Logo.png");
            
            CicleROI(srcPic, logo);
           

            CvInvoke.WaitKey(0);
            Console.ReadLine();
        }


        /// <summary>
        /// 圆形ROI
        /// </summary>
        /// <param name="srcPic"></param>
        /// <param name="logo"></param>
        private static void CicleROI(Mat srcPic, Mat logo)
        {
            Mat imgROI = new Mat(srcPic, new System.Drawing.Rectangle(20, 20, logo.Cols, logo.Rows));
            //定义了一个长为logo.Cols，宽为logo.Rows的矩形遮罩
            Mat mask = Mat.Zeros(logo.Rows, logo.Cols, Emgu.CV.CvEnum.DepthType.Cv8U, 3);
            CvInvoke.Imshow("mask_rec", mask);
            CvInvoke.Circle(mask, new System.Drawing.Point(logo.Size.Width/2, logo.Size.Height / 2), logo.Size.Width / 2, new MCvScalar(255,255,255),-1);
            CvInvoke.Imshow("draw_cicle", mask);

            logo.CopyTo(imgROI, mask);
            CvInvoke.Imshow("srcPic", srcPic);
            CvInvoke.WaitKey(0);
        }
    }
}

运行结果如下图：

高级融合：个人理解是把一张图(一般为Logo图)塞进另外一张图，Logo图比较特别，背景色一般为纯色(白色)，然后把Logo取反后二值化，即把背景色去掉了，只留下Logo重要的内容

代码如下：

using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.Util;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EmguCVDemo2
{
    class Program
    {
        static void Main(string[] args)
        {

            Mat srcPic = new Mat("chunfen1.png");
            Mat logo = new Mat("Logo.png");
            HightROI(srcPic, logo);

            CvInvoke.WaitKey(0);
            Console.ReadLine();
        }


      

        /// <summary>
        /// 高级融入
        /// </summary>
        /// <param name="srcPic"></param>
        /// <param name="logo"></param>
        public static void  HightROI(Mat srcPic, Mat logo)
        {
            Mat imgROI = new Mat(srcPic, new System.Drawing.Rectangle(20, 20, logo.Cols, logo.Rows));
            Mat mask = logo.Clone();
            //对遮罩取反
            CvInvoke.BitwiseNot(mask, mask);
            //对遮罩进行二值化处理
            CvInvoke.Threshold(mask, mask, 100, 255, Emgu.CV.CvEnum.ThresholdType.Binary);

            CvInvoke.Imshow("mask", mask);
            logo.CopyTo(imgROI,mask);
            CvInvoke.Imshow("srcPic", srcPic);
            CvInvoke.WaitKey(0);
        }
    }
}

 运行结果如下图：