CLAHE in android

asked 2015-01-08 02:51:59 -0500

joyrae gravatar image

updated 2015-01-08 02:54:53 -0500

I used JNI for clahe by the column,

But there is error in clahe->apply(Mat m1, Mat m2) .

I couldn't find the reason because of none of the error message. (Just turn down the application.)

So Plz help me...T.T

The Code in JNI

JNIEXPORT int JNICALL Java_com_example_i3bolometerapp_MainActivity_InitCLAHE( JNIEnv *env, jobject thiz, jintArray disp, jint _width, jint _height, jlong addrClahe, jlong addrClaheDst ) {

Mat &mGr  = *(Mat*)addrClahe;
Mat &mGr2  = *(Mat*)addrClaheDst;

Ptr<CLAHE> clahe = createCLAHE();
clahe->apply(mGr, mGr2);

return mGr.cols;


Actually, the column of mGr is returned well. So i dont think mat data is wrong.

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could you add your java code, too ? did you pass in a new Mat() for dst ?

berak gravatar imageberak ( 2015-01-08 03:52:37 -0500 )edit

At Start,

     if (!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, this, mOpenCVCallBack))
         Log.e("TEST", "Cannot connect to OpenCV Manager");

CallBack Function,

private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) {
    public void onManagerConnected(int status) {
        switch (status) {
        case LoaderCallbackInterface.SUCCESS: {
            Log.i("TEST", "OpenCV loaded successfully");


            m_matClahe = new Mat(commData.getWindowingHeight(), commData.getWindowingWidth(), CvType.CV_8UC1);
            m_matClaheDst = new Mat(commData.getWindowingHeight(), commData.getWindowingWidth(), CvType.CV_8UC1);               

            // tmp = new Mat(commData.getWindowingHeight(),
            // commData.getWindowingWidth(), CvType.CV_8UC1);
joyrae gravatar imagejoyrae ( 2015-01-09 22:41:51 -0500 )edit


                    Utils.bitmapToMat(commData.m_bitMain, m_matClahe);

                    int temp = InitCLAHE( commData.m_piDispData, commData.getWindowingWidth(), commData.getWindowingHeight(), m_matClahe.getNativeObjAddr(), m_matClaheDst.getNativeObjAddr());
                    Utils.matToBitmap(m_matClaheDst, commData.m_bitMain);
                    m_textLog.setText(String.format("Return : %d, %d", m_matClaheDst.getNativeObjAddr(), temp));
joyrae gravatar imagejoyrae ( 2015-01-09 22:42:32 -0500 )edit

CLAHE is used in handler,

joyrae gravatar imagejoyrae ( 2015-01-09 22:43:03 -0500 )edit

Dst is initailized in callback function. So i think this is not problem,

And i checked the address of dst.

joyrae gravatar imagejoyrae ( 2015-01-09 22:43:54 -0500 )edit