myopencv.cpp

extern "C" JNIEXPORT void JNICALL
Java_com_jason9075_myopencv_NativeLib_toGrey(
        JNIEnv *env, 
        jobject, 
        jobject bitmapIn, 
        jobject bitmapOut) {
    Mat src, greyOut;
    bitmapToMat(env, bitmapIn, src, false);
    cvtColor(src, greyOut, CV_BGR2GRAY);
    matToBitmap(env, greyOut, bitmapOut, false);
}