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OpenCV error JAVA NETBEANS


OpenCV error JAVA NETBEANS

By : MatthewLi
Date : November 22 2020, 03:01 PM
Hope that helps i get this error after running my project with javacv library. , You can use this below way:
code :
public static void loadOpenCVLib(String path) throws Exception {
    File lib_dir = new File(path);
    System.setProperty("java.library.path", lib_dir.getAbsolutePath());
    Field sys_paths = ClassLoader.class.getDeclaredField("sys_paths");
    sys_paths.setAccessible(true);
    sys_paths.set(null, null);
    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    // it is for the ffmpeg name
    String[] list = lib_dir.list();
    assert list != null;
    String ffmpeg_dll_file_name = null;
    for (String s : list) {
        if (s.contains("ffmpeg")) {
            ffmpeg_dll_file_name = s.substring(0, s.indexOf("."));
        }
    }
    System.loadLibrary(ffmpeg_dll_file_name);
}
loadOpenCVLib("D:\\opencv_lib");


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opencv with netbeans c++ linker error

opencv with netbeans c++ linker error


By : Manuel Cortez
Date : March 29 2020, 07:55 AM
With these it helps I'm trying to run the following code which i found online to see if i've set up opencv correctly, , I think this might be easy fix. Add:
code :
 using namespace cv;
 using namespace std;
How to Use OpenCV for Java in Netbeans-Ubuntu

How to Use OpenCV for Java in Netbeans-Ubuntu


By : Abhinav Kant
Date : March 29 2020, 07:55 AM
This might help you finally resolved it. Issue was in native library installation and path. i reinstall opencv and set native library path as
code :
/home/user/opencv-3.1.0/build/lib
Use OpenCV Mat in Android Java Application. NoClassDefFound Error with OpenCV Mat

Use OpenCV Mat in Android Java Application. NoClassDefFound Error with OpenCV Mat


By : KVNP
Date : March 29 2020, 07:55 AM
Hope that helps There are 3 ways to include OpenCV in your app
Use NDK to compile opencv and write your own wrapper to include your opencv c++ code. Import the OpenCV java wrapper module provided by Android Opencv SDK and connect it to Opencv manager installed on your phone. Import the OpenCV java wrapper module provided by Android Opencv SDK and copy the native libraries in your project.
code :
    if(!OpenCVLoader.initDebug()) {
        Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization.");
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
    } else {
        Log.d(TAG, "OpenCV library found inside package using it.");
        mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
    }
OpenCV Error: Assertion failed (!empty()) in java and opencv 3.0 and what does it mean?

OpenCV Error: Assertion failed (!empty()) in java and opencv 3.0 and what does it mean?


By : Paul Kim
Date : March 29 2020, 07:55 AM
this will help It seems that the classifier is not being loaded properly from file.
Please ensure that faceDetector.load() returns true, otherwise the file is not being read.
Java- OpenCV Error: OpenCV Error: Assertion failed (dims <= 2 && step[0] > 0)

Java- OpenCV Error: OpenCV Error: Assertion failed (dims <= 2 && step[0] > 0)


By : Rishabh Garg
Date : March 29 2020, 07:55 AM
like below fixes the issue Had the same error and followed the very valuable hint of @Miki. In my case the image wasn't loaded properly because of unsuitable bit-depth. 32 instead of 8 bit for a greyscale image.
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