opencv之图像叠加与图像混合

opencv之图像叠加与图享混合

• ROI区域

cv::Mat image_roi = image(cv::Rect(x, y, width, height));
cv::Mat image_roi = image(cv::Range(y, y + height), cv::Range(x, x + width));

• 线性混合

void addWeighted(InputArray src1, double alpha, InputArray src2,
                 double beta, double gamma, OutputArray dst, int dtype = -1);

注： dst = src1[I] * alpha + src2[I] * beta + gamma

• 实例

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

using namespace cv;
using namespace std;

bool  ROI_AddImage()
{
    Mat srcImage1= imread("/home/test/dota_pa.jpg");
    Mat logoImage= imread("/home/test/dota_logo.jpg");
    if( !srcImage1.data ) { printf("srcImage1 dont exist! \n"); return false; }
    if( !logoImage.data ) { printf("logoImage dont exist! \n"); return false; }

    // create roi
    Mat imageROI= srcImage1(Rect(200,250,logoImage.cols,logoImage.rows));
    // create mask
    Mat mask= imread("dota_logo.jpg",0);
    
    logoImage.copyTo(imageROI,mask);
    namedWindow("ROI_AddImage");
    imshow("ROI_AddImage",srcImage1);

    return true;
}

bool  LinearBlending()
{
    double alphaValue = 0.5; 
    double betaValue = 1.0 - alphaValue;
    Mat srcImage2, srcImage3, dstImage;
    srcImage2 = imread("/home/test/mogu.jpg");
    srcImage3 = imread("/home/test/rain.jpg");
    if( !srcImage2.data ) { printf("srcImage2 dont exist! \n"); return false; }
    if( !srcImage3.data ) { printf("srcImage3 dont exist! \n"); return false; }

  // line blending
    addWeighted( srcImage2, alphaValue, srcImage3, betaValue, 0.0, dstImage);
    imshow( "raw_image", srcImage2 );
    imshow( "LinearBlending", dstImage );

    return true;
}

bool  ROI_LinearBlending()
{
    Mat srcImage4= imread("/home/test/dota_pa.jpg",1);
    Mat logoImage= imread("/home/test/dota_logo.jpg");
    if( !srcImage4.data ) { printf("srcImage4 dont exist! \n"); return false; }
    if( !logoImage.data ) { printf("logoImage dont exist! \n"); return false; }

    Mat imageROI = srcImage4(Rect(200,250,logoImage.cols,logoImage.rows));
    //imageROI= srcImage4(Range(250,250+logoImage.rows),Range(200,200+logoImage.cols));
    
    addWeighted(imageROI,0.5,logoImage,0.3,0.,imageROI);
    imshow("ROI_LinearBlending",srcImage4);

    return true;
}

int main(   )
{
    if(ROI_AddImage( )&& LinearBlending( )&&ROI_LinearBlending( ))
    {
        cout<<endl<<"yes!";
    }

    waitKey(0);
    return 0;
}

注： 使用roi和mask方式，添加图标

注：使用addWeighted()混合两张图像。

注：也可以使用roi和addWeighted()方式，添加图标

Mat imageROI = srcImage4(Rect(200,250,logoImage.cols,logoImage.rows));
addWeighted(imageROI,0,logoImage,1,0.,imageROI);
imshow("ROI_LinearBlending",srcImage4);