OpenCV学习:实现简单的图像叠加
本实例使用简单的线性叠加方法来实现两幅图像的叠加,主要使用的知识如下:
1)线性融合
2)addWeighted函数
//! computes weighted sum of two arrays (dst = alpha*src1 + beta*src2 + gamma)
CV_EXPORTS_W void addWeighted(InputArray src1, double alpha, InputArray src2,
double beta,
double gamma,
OutputArray dst,
int dtype=-1
);
Parameters
src1 – First source array.
alpha – Weight for the first array elements.
src2 – Second source array of the same size and channel number as src1 .
beta – Weight for the second array elements.
dst – Destination array that has the same size and number of channels as the input arrays.
gamma – Scalar added to each sum.
dtype – Optional depth of the destination array. When both input arrays have the same depth, dtype can be set to -1, which will be equivalent to src1.depth().
代码如下:
//图像叠加(Mat) #include <opencv2/opencv.hpp> using namespace cv; using namespace std; int main( int argc, char** argv ) { double alpha = 0.5; double beta; double input; Mat src1, src2, dst; /// 请输入alpha值 cout<<" Simple Linear Blender "<<endl; cout<<"-----------------------"<<endl; cout<<"*Enter alpha [0-1]: "; /// 获取alpha输入 cin >> input; if( input >= 0.0 && input <= 1.0 ) { alpha = input; } /// 加载相同尺寸,相同格式的两张图像 src1 = imread("./Res/Windows7_logo.jpg"); src2 = imread("./Res/Windows7_text.jpg"); if( !src1.data ) { printf("Error loading src1 \n"); return -1; } if( !src2.data ) { printf("Error loading src2 \n"); return -1; } /// 创建显示窗口 namedWindow("Image one", 1); namedWindow("Image two", 1); namedWindow("Linear Blend", 1); /// 执行线性融合 beta = 1.0 - alpha; addWeighted( src1, alpha, src2, beta, 0.0, dst); /// 显示结果 imshow( "Image one", src1 ); imshow( "Image two", src2 ); imshow( "Linear Blend", dst ); /// 等待键盘事件 waitKey(0); return 0; }
运行结果:
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