Java Code Examples for org.opencv.core.Core#gemm()

The following examples show how to use org.opencv.core.Core#gemm() . These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may want to check out the right sidebar which shows the related API usage.
Example 1
Source Project: classchecks   File: Recognition.java    License: Apache License 2.0 5 votes vote down vote up
public static Mat subspaceProject(Mat W, Mat mean, Mat src) {
	int n = src.rows();
	int d = src.cols();
	Mat X = new Mat();
	Mat Y = new Mat();
	src.convertTo(X, W.type());
	if(!mean.empty()) {
		for(int i = 0; i < n; i ++) {
			Mat r_i = X.row(i);
			Core.subtract(r_i, mean.reshape(1, 1), r_i);
		}
	}
	Core.gemm(X, W, 1.0, new Mat(), 0.0, Y);
	return Y;
}
 
Example 2
Source Project: classchecks   File: Recognition.java    License: Apache License 2.0 5 votes vote down vote up
public static Mat subspaceReconstruct(Mat W, Mat mean, Mat src) {
	int n = src.rows();
	int d = src.cols();
	Mat X = new Mat();
	Mat Y = new Mat();
	src.convertTo(Y, W.type());
	Core.gemm(Y, W, 1.0, new Mat(), 0.0, X, 2);
	if(!mean.empty()) {
		for(int i = 0; i < n; i ++) {
			Mat r_i = X.row(i);
			Core.add(r_i, mean.reshape(1, 1), r_i);
		}
	}
	return X;
}
 
Example 3
public static Rect[] rotateFaces(Mat img, Rect[] faces, int angle){
    Point center = new Point(img.cols()/2, img.rows()/2);
    Mat rotMat = Imgproc.getRotationMatrix2D(center, angle, 1);
    rotMat.convertTo(rotMat, CvType.CV_32FC1);
    float scale = img.cols()/img.rows();
    for(Rect face : faces){
        Mat m = new Mat(3, 1, CvType.CV_32FC1);
        m.put(0,0,face.x);
        m.put(1,0,face.y);
        m.put(2,0,1);
        Mat res = Mat.zeros(2,1,CvType.CV_32FC1);
        Core.gemm(rotMat, m, 1, new Mat(), 0, res, 0);
        face.x = (int)res.get(0,0)[0];
        face.y = (int)res.get(1,0)[0];
        if(angle == 270 || angle == -90){
            face.x = (int)(face.x * scale - face.width);
            face.x = face.x + face.width/4;
            face.y = face.y + face.height/4;
        }else if(angle == 180 || angle == -180){
            face.x = face.x - face.width;
            face.y = face.y - face.height;
        }else if(angle == 90 || angle == -270){
            face.y = (int)(face.y * scale - face.height);
            face.x = face.x - face.width/4;
            face.y = face.y - face.height/4;
        }
    }
    return faces;
}