Android上的OpenCV findContours抛出异常

时间:2012-09-17 10:33:06

标签: java android opencv

我在Android上使用OpenCV 2.4.0并尝试在二进制邮件中找到轮廓。

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);

但该函数会抛出“函数CvMat中无法识别或不支持的数组类型...”异常。

我也尝试将此Mat作为输入:

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

但我得到同样的例外。

2 个答案:

答案 0 :(得分:1)

尝试此功能查找轮廓:

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;

}

答案 1 :(得分:0)

确保在Canny()调用之后,mIntermediateMat的类型为CvType.CV_8 *