在Android findContours OpenCV的抛出异常 [英] OpenCV on Android findContours throws Exception

问题描述

我用在Android 2.4.0 OpenCV的，并设法找到轮廓二进制imgage。

I use OpenCV 2.4.0 on Android and try to find contours in a binary imgage.

List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Mat mIntermediateMat = new Mat();
Imgproc.Canny(img, mIntermediateMat, 50, 100);
Imgproc.findContours(mIntermediateMat, contours, new Mat(), Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);

但函数抛出了功能无法识别与CvMat或不支持数组类型...异常。

But the function throws a "Unrecognized or unsupported array type in function CvMat..." exception.

此外，我试试这个垫子作为输入：

Also i try this Mat as input:

Mat mIntermediateMat = new Mat(height, width, CvType.CV_8UC1, new Scalar(0));

但我得到相同的异常。

But i get the same exception.

推荐答案

试试这个功能找到等高线：

Try this function to find contours :

public static ArrayList<Rect> detection_contours(Mat outmat) {
    Mat v = new Mat();
    Mat vv = outmat.clone();
    List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
    Imgproc.findContours(vv, contours, v, Imgproc.RETR_LIST,
            Imgproc.CHAIN_APPROX_SIMPLE);

    double maxArea = 100;
    int maxAreaIdx = -1;
    Rect r = null;
    ArrayList<Rect> rect_array = new ArrayList<Rect>();

    for (int idx = 0; idx < contours.size(); idx++) {
        Mat contour = contours.get(idx);
        double contourarea = Imgproc.contourArea(contour);
        if (contourarea > maxArea) {
            // maxArea = contourarea;
            maxAreaIdx = idx;
            r = Imgproc.boundingRect(contours.get(maxAreaIdx));
            rect_array.add(r);
          //  Imgproc.drawContours(imag, contours, maxAreaIdx, new Scalar(0,0, 255));
        }

    }

    v.release();

    return rect_array;

}

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