ROI与Mask掩码
1、ROI概念与操作;
2、Mask概念与操作;
ROI(region of interest)
1、ROI 区域为感兴趣区域,一般为矩形区域,能够快速确定图像分析的重点,减少图像处理时间,提高精度;
2、使用Rectangle类表示矩形区域或用Range类设定行列范围;
ROI Demo
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Emgu.CV;
using Emgu.Util;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using System.Drawing;
namespace lesson11
{
class Program
{
static void Main(string[] args)
{
Mat src = CvInvoke.Imread("c:/users/hello/desktop/picture/lena.tiff");
if(src.IsEmpty)
{
Console.WriteLine("could not load the image...");
return;
}
CvInvoke.Imshow("input image", src);
//Mat ROI = new Mat(src, new Rectangle(229, 211, 132, 172)); //提取感兴趣区域(浅拷贝)
//进行深拷贝,防止ROI区域修改原图像
Mat ROI = new Mat(src, new Range(211, 211 + 172), new Range(229, 229 + 132)).Clone();
CvInvoke.MedianBlur(ROI, ROI, 9);
CvInvoke.Imshow("input image2", src);
CvInvoke.Imshow("ROI image", ROI);
Mat logo = CvInvoke.Imread("C:/users/hello/desktop/20.jpg");
Mat src1 = CvInvoke.Imread("c:/users/hello/desktop/picture/lena.tiff");
Mat ROI1 = new Mat(src1,new Rectangle(10, 10, logo.Width, logo.Height)); //设置感兴趣区域
logo.CopyTo(ROI1);
CvInvoke.Imshow("change image", src1);
CvInvoke.WaitKey(0);
}
}
}
ROI效果
贴图与提取感兴趣区域:
Mask掩膜
1、mask掩膜是一个8位单通道图像(灰度图,二值图);掩膜矩阵为0的位置表示对原图像不进行操作、为1表示在此位置上进行操作;
2、掩膜可以作一些高级的图像融合操作;
Code
/**************Mask掩码融合*******************/
//Mat img = CvInvoke.Imread("c:/users/hello/desktop/picture/lena.tiff");
//Mat logo = CvInvoke.Imread("c:/users/hello/desktop/20.jpg");
//Mat mask = new Mat();
//CvInvoke.CvtColor(logo, mask, ColorConversion.Bgr2Gray);
//CvInvoke.BitwiseNot(mask, mask);
//CvInvoke.Imshow("Bitwise not", mask);
//CvInvoke.Threshold(mask, mask, 100, 255, ThresholdType.Binary); //非目标区像素值为0
//CvInvoke.Imshow("threshold image", mask);
//Mat ROI = new Mat(img, new Rectangle(10, 10, logo.Width, logo.Height));
//logo.CopyTo(ROI, mask); //通过mask掩码提取特定的非0区域图像
//CvInvoke.Imshow("final result", img);
//自定义掩码
//Mat src = CvInvoke.Imread("c:/users/hello/desktop/picture/2.jpg");
//Mat logo = CvInvoke.Imread("c:/users/hello/desktop/picture/lena.tiff");
//Mat mask = Mat.Zeros(logo.Rows,logo.Cols, DepthType.Cv8U, 1); //创建一个黑色图像
//CvInvoke.Circle(mask, new Point(298, 295), 100, new MCvScalar(255), -1);//绘制一个白色圆
//CvInvoke.Imshow("mask image", mask);
//Mat ROI = new Mat(src, new Rectangle(10, 10,logo.Width,logo.Height));
//logo.CopyTo(ROI, mask);
//CvInvoke.Imshow("final image", src);
//加载图像作为掩码
Mat src = CvInvoke.Imread("c:/users/hello/desktop/picture/2.jpg");
Mat logo = CvInvoke.Imread("c:/users/hello/desktop/picture/lena.tiff");
Mat mask = CvInvoke.Imread("c:/users/hello/desktop/mask.jpg",ImreadModes.Grayscale); //掩膜必须是灰度图
CvInvoke.Threshold(mask, mask, 100, 255, ThresholdType.Binary); //阈值化处理一下
Mat ROI = new Mat(src, new Rectangle(20, 20, logo.Width, logo.Height));
logo.CopyTo(ROI,mask);
CvInvoke.Imshow("final image", src);
CvInvoke.WaitKey(0);
Mask 掩膜效果
高级图像融合: