Example usage for org.opencv.core Mat inv

Introduction

In this page you can find the example usage for org.opencv.core Mat inv.

Prototype

public Mat inv() 

Source Link

Usage

From source file:com.nekomeshi312.whiteboardcorrection.WhiteBoardDetect.java

License:Open Source License

/**
 * ????????// ww  w.  ja v a 2s .  co  m
 * @param lineEq ?????(ax+by=1) ??[angle][section]
 * @param points ?ArrayList
 * @param img ????null??????
 * @return true:? false:
 */
private boolean calcSquare(StraightLineEquation lineEq[][], ArrayList<Point> points, Mat img) {
    //2??
    Mat mat = new Mat(2, 2, CvType.CV_32F);
    mPointCenterX = 0.0f;
    mPointCenterY = 0.0f;
    int counter = 0;
    for (int ang0sec = 0; ang0sec < 2; ang0sec++) {
        mat.put(0, 0, lineEq[0][ang0sec].a);
        mat.put(0, 1, lineEq[0][ang0sec].b);
        for (int ang1sec = 0; ang1sec < 2; ang1sec++) {
            mat.put(1, 0, lineEq[1][ang1sec].a);
            mat.put(1, 1, lineEq[1][ang1sec].b);
            Mat matAns;
            try {
                matAns = mat.inv();
                if (matAns == null)
                    return false;
            } catch (Exception e) {//??????????
                e.printStackTrace();
                return false;
            }
            float x = (float) (matAns.get(0, 0)[0] + matAns.get(0, 1)[0] + mCenterX);
            float y = (float) (matAns.get(1, 0)[0] + matAns.get(1, 1)[0] + mCenterY);
            Point p = new Point(x, y);
            points.add(p);
            mPointCenterX += x;
            mPointCenterY += y;
            counter++;
        }
    }
    mPointCenterX /= (float) counter;
    mPointCenterY /= (float) counter;
    //????
    Collections.sort(points, new PointComparator());
    if (img != null) {
        Scalar color[] = new Scalar[4];
        color[0] = new Scalar(0xff, 0x00, 0x00);
        color[1] = new Scalar(0x00, 0xff, 0x00);
        color[2] = new Scalar(0x00, 0x00, 0xff);
        color[3] = new Scalar(0xff, 0x00, 0xff);

        for (int i = 0; i < 4; i++) {
            Core.circle(img, points.get(i), 30, color[i], 5);
        }
    }
    if (MyDebug.DEBUG) {
        for (int i = 0; i < 4; i++) {
            Log.d(LOG_TAG, "point(" + i + ") = " + points.get(i).x + ":" + points.get(i).y);
        }
    }

    return true;
}

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