public int HistogramEvenGetBufferSize(int[] nLevels)
{
int bufferSize = 0;
status = NPPNativeMethods.NPPi.Histogram.nppiHistogramEvenGetBufferSize_8u_C3R(_sizeRoi, nLevels, ref bufferSize);
Debug.WriteLine(String.Format("{0:G}, {1}: {2}", DateTime.Now, "nppiHistogramEvenGetBufferSize_8u_C3R", status));
NPPException.CheckNppStatus(status, this);
return bufferSize;
}