} else if (pointer instanceof DoublePointer && dataType == CV_64F) {
            DoubleIndexer ptridx = DoubleIndexer.create((DoublePointer)pointer, new long[] {channels, rows, cols},
                    new long[] {stride[rank == 3 ? 0 : 1], stride[rank == 3 ? 1 : 2], stride[rank == 3 ? 2 : 3]}, direct);
            DoubleIndexer idx = (DoubleIndexer)matidx;
            for (long k = 0; k < channels; k++) {