How to Convert Mat to ArrayList<Point> Java

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Hi, I could not able to convert Mat to List<ponit> and getting pixels.Could you please help me on this.

My source code looks like:

     // we first blur the gray scale image 
        Mat blurred = new Mat(gray.size(),gray.type()); 
        Mat binary4c = new Mat(gray.size(),gray.type()); 
        Imgproc.GaussianBlur(gray,blurred,new Size(0,0),1,1); 
        // next we threshold the blurred image 
        Imgproc.threshold(blurred,binary4c,128,255,Imgproc.THRESH_BINARY);

        Mat mHierarchy = new Mat(); 
        List<MatOfPoint> contours = new ArrayList<MatOfPoint>(); 
        Imgproc.findContours(binary4c, contours, mHierarchy, Imgproc.RETR_LIST,Imgproc.CHAIN_APPROX_SIMPLE);
       int dpi=300;    // select dpi, 300 is optimal for OCR
    List<Point> corners=getOuterQuad(contours); // find corners from contour
    /*List<Point> corners= new ArrayList<>();
    for(int i=0;i<=contours.size();i++){
        Converters.Mat_to_vector_Point(contours.get(i), corners);
    }*/

    List<Point> corners=getOuterQuad(contours); //// find corners from contour
    Point inchesDim=????????????????????????;  // select business card dimensions and compute pixels
    float inchesWide=inchesDim.x;
    float inchesHigh=inchesDim.y;
    int pixelsWide = (int)(inchesWide*dpi); // width and height of business card at given dpi
    int pixelsHigh = (int)(inchesHigh*dpi);
    // now establish from and to parameters for warpPerspective
    Point[] fromPts = {corners.get(0),corners.get(1),corners.get(2),corners.get(3)};
    Point[] toPts = {new Point(0,0), new Point(0,pixelsHigh), new Point(pixelsWide,pixelsHigh), new 
        Point(pixelsWide,0)};
    MatOfPoint2f srcPts = new MatOfPoint2f(); srcPts.fromArray(fromPts);
    MatOfPoint2f dstPts = new MatOfPoint2f(); dstPts.fromArray(toPts);
    Mat hh=Calib3d.findHomography(srcPts,dstPts);
    Mat rectified=Mat.zeros(pixelsHigh,pixelsWide,gray.type());
    Imgproc.warpPerspective(gray,rectified, hh,rectified.size());
    // condition the output image a little
    Core.normalize(rectified,rectified,0,255,Core.NORM_MINMAX,CvType.CV_8UC1);
    float meanA=(float) Core.mean(rectified).val[0];
    if(meanA>128) {
        Core.bitwise_not(rectified,rectified);
    }

Could anyone please help on this.