使用打开的简历获取Sudoku网格线

如何解决使用打开的简历获取Sudoku网格线

我正在开发一个可通过相机解决数独的应用程序。我正在使用OpenCV库。我花了一些时间进行研究，并决定尝试this项目，因为我是图像识别的新手。

我在检测网格线时遇到问题。使用我拥有的代码，app只检测到一条水平线或一条垂直线（取决于阈值，在51以下，返回一条垂直线；在52以上，返回一条水平线）。这是我发现拐角的功能，在这里我正在检测线条：

private List<Point> findCorners(Mat mat) {
    Mat lines = new Mat();
    List<double[]> horizontalLines = new ArrayList<double[]>();
    List<double[]> verticalLines = new ArrayList<double[]>();

    //Imgproc.GaussianBlur( mat,lines,new Size(5,5),2,2 );
    int threshold = 150;
    int minLineSize = 0;
    int lineGap = 10;
    //Imgproc.Canny(mat,70,100);
    Imgproc.HoughLinesP(mat,1,Math.PI / 180,threshold);

    for (int i = 0; i < lines.cols(); i++) {
        double[] line = lines.get(0,i);
        double x1 = line[0];
        double y1 = line[1];
        double x2 = line[2];
        double y2 = line[3];
        if (Math.abs(y2 - y1) < Math.abs(x2 - x1)) {
            horizontalLines.add(line);
        } else if (Math.abs(x2 - x1) < Math.abs(y2 - y1)) {
            verticalLines.add(line);
        }
    }
    String lineInfo = String.format(
            "horizontal: %d,vertical: %d,total: %d",horizontalLines.size(),verticalLines.size(),lines.cols());
    Log.d(TAG_HOUGHLINES,lineInfo);

    // find the lines furthest from centre which will be the bounds for the
    // grid
    double[] topLine = horizontalLines.get(0);
    double[] bottomLine = horizontalLines.get(0);
    double[] leftLine = verticalLines.get(0);
    double[] rightLine = verticalLines.get(0);

    double xMin = 1000;
    double xMax = 0;
    double yMin = 1000;
    double yMax = 0;

    for (int i = 0; i < horizontalLines.size(); i++) {
        if (horizontalLines.get(i)[1] < yMin
                || horizontalLines.get(i)[3] < yMin) {
            topLine = horizontalLines.get(i);
            yMin = horizontalLines.get(i)[1];
        } else if (horizontalLines.get(i)[1] > yMax
                || horizontalLines.get(i)[3] > yMax) {
            bottomLine = horizontalLines.get(i);
            yMax = horizontalLines.get(i)[1];
        }
    }

    for (int i = 0; i < verticalLines.size(); i++) {
        if (verticalLines.get(i)[0] < xMin
                || verticalLines.get(i)[2] < xMin) {
            leftLine = verticalLines.get(i);
            xMin = verticalLines.get(i)[0];
        } else if (verticalLines.get(i)[0] > xMax
                || verticalLines.get(i)[2] > xMax) {
            rightLine = verticalLines.get(i);
            xMax = verticalLines.get(i)[0];
        }
    }

    // obtain four corners of sudoku grid
    Point topLeft = ImgManipUtil.findCorner(topLine,leftLine);
    Point topRight = ImgManipUtil.findCorner(topLine,rightLine);
    Point bottomLeft = ImgManipUtil.findCorner(bottomLine,leftLine);
    Point bottomRight = ImgManipUtil.findCorner(bottomLine,rightLine);

    List<Point> corners = new ArrayList<Point>(4);
    corners.add(topLeft);
    corners.add(topRight);
    corners.add(bottomLeft);
    corners.add(bottomRight);

    return corners;
}

Here是输入图像