NDK - Denoise an Image in NDK (Involving 2D array manipulation)

I have a denoising algorithm that removes noise from images. I want to implement it in NDK. I pass a 2D array containing the pixels of the image. process it and return another 2D array containing the denoised image. I've tried the following code, but I still don't know how to wrap a 1D array inside a JObjectArray to return it as 2D array. Here is my code, I'm not sure about the allocations and deallocation, and I fear about OutOfMemory problems when passing 3000*3000 image. hope you can help.: JNIEXPORT jobjectArray JNICALL Java_com_example_Denoise (JNIEnv *env, jobject obj, jobjectArray arr,jint w, jint h){ double *img1 = new double[w*h]; int i, j, k; ///////////////////READING THE INPUT ARRAY//////////////////////// jsize dim1 = env->GetArrayLength(arr); for (i = 0; i < dim1; i++) { jdoubleArray oneDim= (jdoubleArray)env->GetObjectArrayElement(arr, i); jdouble *element= env->GetDoubleArrayElements(oneDim, 0); int dim2 = env->GetArrayLength(oneDim); for(j=0; j<dim2; j++){ img1[i*dim2 +j] = element[j]; } } ////////////////////Processing///////////////////////////////////// double *y1 = new double[w]; double *y2 = new double[w]; double *img2 = new double[w * h]; for ( j = 0; j < h; j++) { for ( i = 0; i < w; ++i) { y1[i] = ///some basic processing using img1; y2[i] = ///some other basic processing using img1; } for (int i = 0; i < w; i++) { img2[j*w+i] = y1[i] + y2[i]; } } y1 = new double[h]; y2 = new double[h]; double *img3 = new double[w * h]; for ( i = 0; i < w; i++) { for ( j = 0; j < h; ++j) { y1[j] = ///some basic processing using img2; y2[j] = ///some other basic processing using img2; } for ( j = 0; j < w; j++) { img3[i*w+j] = y1[j] + y2[j]; } } /////////////////////////////Prepare the JObjectArray to return///////////////////////////////////// //Here I don't know how can I put img3[] inside a 2D JobjectArray like array[w][h] and return it to android //to receive it as array[w][h]. But I tried this: jclass ArrayClass = env->FindClass( "[D"); jobjectArray outer = env->NewObjectArray( w, ArrayClass, 0); for (i = 0; i < w; i++) { jdoubleArray inner = env->NewDoubleArray( h); env->SetDoubleArrayRegion( inner, 0, h, img3[i]); env->SetObjectArrayElement( outer, i, inner); env->DeleteLocalRef( inner); } return outer; }