You can blend two images in OpenCV using the addWeighted() method of the Core class.
This method accepts two Mat objects (representing the source matrix and the target matrix) and two double values representing the required weights of the image alpha and gamma, and calculates their weighted sum.
Example
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; public class AddingTwoImages { public static void main( String[] args ) { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); //Reading the input images Mat src1 = Imgcodecs.imread("D://images//a1.jpg"); Mat src2 = Imgcodecs.imread("D://images//a2.jpg"); //Creating an empty matrix to store the result Mat dst = new Mat(); //Adding two images Core.addWeighted(src1, 0.4, src2, 0.8, 0, dst); HighGui.imshow("Adding two images", dst); HighGui.waitKey(0); } }<strong> </strong>
Input picture 1

Input image 2

Output

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