OpenCV的：多米诺骨牌圆点/磁盘检测 [英] OpenCV: Dominoes circular spots/disks detection

问题描述

我开发一个Android应用程序的计算之中，看到的多米诺骨牌件-shown使用OpenCV进行Android的图片 - 的所有点的总和。

I am developing an Android app that calculates the sum of all points of the being-seen dominoes pieces -shown in picture- using OpenCV for Android.

现在的问题是，我无法找到一个方法来过滤其他轮廓，只计算点我在多米诺骨牌看到，我试图用Canny边缘寻找，然后使用HoughCircles，但没有结果，因为我没有岩石和HoughCircles绝对俯视探测正圆只：）

The problem is, I can't find a way to filtering other contours and counting only dots I see in the dominoes, I tried to use Canny edge finding then use HoughCircles, but with no result, as I don't have an absolute top view of the rocks and HoughCircles detect perfect circles only :)

下面是我的code：

public Mat onCameraFrame(Mat inputFrame) {
    inputFrame.copyTo(mRgba);

    Mat grey = new Mat();
    // Make it greyscale
    Imgproc.cvtColor(mRgba, grey, Imgproc.COLOR_RGBA2GRAY);

    // init contours arraylist
    List<MatOfPoint> contours = new ArrayList<MatOfPoint>(200);     

    //blur
    Imgproc.GaussianBlur(grey, grey, new Size(9,9), 10);        
    Imgproc.threshold(grey, grey, 80, 150, Imgproc.THRESH_BINARY);


    // because findContours modifies the image I back it up
    Mat greyCopy = new Mat();
    grey.copyTo(greyCopy);


    Imgproc.findContours(greyCopy, contours, new Mat(), Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_NONE);      
    // Now I have my controus pefectly


    MatOfPoint2f mMOP2f1 = new MatOfPoint2f();

    //a list for only selected contours
    List<MatOfPoint> SelectedContours = new ArrayList<MatOfPoint>(400);     

    for(int i=0;i<contours.size();i++)
    {

        if(here I should put a condition that distinguishes my spots, eg: if contour inside is black and is a black disk)
        {
            SelectedContours.add(contours.get(i));
        }
    }
    Imgproc.drawContours(mRgba, SelectedContours, -1, new Scalar(255,0,0,255), 1);       
    return mRgba;        
}

编辑：

我的轮廓，一个独特的功能后，门槛是他们是全黑的里面，反正是有，我可以计算平均色彩/亮度为给定的轮廓？

One unique feature of my contours after threshold is they're totally black from inside, is there anyway I could calculate the mean color/intensity for a given contour ?

推荐答案

有一个类似的问题和SO可能的解决方案，名为<一个href="http://stackoverflow.com/questions/4785419/detection-of-coins-and-fit-ellipses-on-an-image">Detection对图片硬币（和合适的椭圆）。在这里你会找到有关的OpenCV的功能有些recomendations fitEllipse 。

There is a similiar problem and possible solution on SO, titled Detection of coins (and fit ellipses) on an image. Here you will find some recomendations about opencv's function fitEllipse.

您应该看看<一href="http://opencv.willowgarage.com/documentation/cpp/imgproc_structural_analysis_and_shape_descriptors.html#cv-fitellipse"相对=nofollow>这对OpenCV的函数的详细信息 fitEllipse 。

You should take a look at this for more info on opencv's function fitEllipse.

此外，检测的图像只有黑色的元素，你可以使用HSV颜色模型，发现只有黑色的颜色。您可以这里找到一个解释。

Also, to detect only black elements in an image, you can use HSV color model, to find only black colors. You can find an explanation here.

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