Question

我尝试在Android手机上使用OpenCV来检测线路。我只是一个初学者，我不完全理解此代码，因为我从互联网上改编了它。最后，我只看到一行，而不是全部。有人可以帮我吗？

    Bitmap bmp = ((BitmapDrawable)viewImage.getDrawable()).getBitmap();
    Mat grayMat = new Mat();
    Mat cannyEdges = new Mat();
    Mat lines = new Mat();
    Mat originalMat = new Mat();
    Utils.bitmapToMat(bmp, originalMat);

    //Converting the image to grayscale
    Imgproc.cvtColor(originalMat, grayMat, Imgproc.COLOR_BGR2GRAY);
    Imgproc.Canny(grayMat, cannyEdges, 10, 100);
    Imgproc.HoughLinesP(cannyEdges, lines, 1, Math.PI / 180, 50, 20, 20);

    Mat houghLines = new Mat();
    houghLines.create(cannyEdges.rows(), cannyEdges.cols(), CvType.CV_8UC1);

    //Drawing lines on the image
    for (int i = 0; i < lines.cols(); i++) {
        double[] points = lines.get(0, i);
        double x1, y1, x2, y2;
        x1 = points[0];
        y1 = points[1];
        x2 = points[2];
        y2 = points[3];
        Point pt1 = new Point(x1, y1);
        Point pt2 = new Point(x2, y2);

        //Drawing lines on an image
        Imgproc.line(houghLines, pt1, pt2, new Scalar(255, 0, 0), 1);
    }

    //Converting Mat back to Bitmap
    Utils.matToBitmap(houghLines, bmp);
    viewImage.setImageBitmap(bmp);

Answer 1

确定canny输出或您的输入有足够的行来检测吗？此代码将打印所有行。所以我想这是您的数据问题。

先查看canny输出多少行。如果是由于canny更改canny参数引起的

Utils.matToBitmap(cannyEdges, bmp);
viewImage.setImageBitmap(bmp);

然后，如果canny可以看到很多直线却没有输出？不用担心，更改houghline参数

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