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Hi,i am using the opencv findCountour function in finding the contour and draw the found contour on the image. The code seems to have no issue, however when i try to debug, it show the error that the variable "hierarchy" cannot be be find. I am not sure why is this so, help please, thank you.

The problem seems to be at the file (this is imported from opencv)whereby the hierarchy is in red(meaning error).

//javadoc: findContours(image, contours, hierarchy, mode, method)
   public static void findContours(Mat image, List<MatOfPoint> contours, Mat mat, int mode, int method)
       Mat contours_mat = new Mat();
       findContours_1(image.nativeObj, contours_mat.nativeObj, hierarchy.nativeObj, mode, method);
       Converters.Mat_to_vector_vector_Point(contours_mat, contours);

What I have tried:

part of the findContour code

//find contour
        List<MatOfPoint> contours = new ArrayList<>();
        //Imgproc.findContours(outputImage,contours,new Mat(),Imgproc.RETR_LIST,Imgproc.CHAIN_APPROX_SIMPLE);
        Imgproc.findContours(outputImage,contours, hierarchy,Imgproc.RETR_LIST,Imgproc.CHAIN_APPROX_SIMPLE);
        //draw contour
        Imgproc.drawContours(outputImage,contours,-1,new Scalar(0,255,0));
Richard MacCutchan 26-Jun-18 5:57am    
Where is the hierarchy object declared in your code?
Member 13882534 26-Jun-18 21:05pm    
It is being declare in the method, Mat hierarchy = new Mat(); but the same error still exist
Richard MacCutchan 27-Jun-18 3:22am    
Well it is obviously not visible within the scope of the code you have shown above.

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