diff --git a/peakCentering/sourceCode/peakCentering.cpp b/peakCentering/sourceCode/peakCentering.cpp
index 4556bcd..ffc1b7b 100644
--- a/peakCentering/sourceCode/peakCentering.cpp
+++ b/peakCentering/sourceCode/peakCentering.cpp
@@ -53,6 +53,7 @@ void peakCentering(
 	RgnPix zeroData = {0,0,0,0,0,0,0};
 	//ping-pong buffer
 	RgnPix HSyncData_d1 = {0,0,0,0,0,0,0};
+	ap_uint<12> LazerWinX_d1 = 0;
 	ap_uint<8> lineBuff_0[RGN_DATA_WIN_SIZE * 2];
 //#pragma HLS RESOURCE variable=lineBuff_0 core=RAM_2P
 	ap_uint<8> lineBuff_1[RGN_DATA_WIN_SIZE * 2];
@@ -89,18 +90,21 @@ void peakCentering(
 
 			if(0 == i)  //HSync
 			{
-				if ((n > 0) &&( linePk.len>0))
-					OutCenteringPnt.write(HSyncData_d1);
-				HSyncData_d1 = InData;
-
-				pkRng_S = InData.RltvRdx.range(3,0) + RGN_DATA_WIN_SIZE/2;
-				pkRng_E = InData.RltvRdx.range(7,4) + RGN_DATA_WIN_SIZE/2;
-
 				evenFlag = n%2;
 				if(0 == linePk.len)
 					pkCenter = RGN_DATA_WIN_SIZE/2;
 				else
 					pkCenter = linePk.start + (linePk.len >> 1);
+				HSyncData_d1.LazerWinX = LazerWinX_d1 + pkCenter;
+
+				if ((n > 0) &&( linePk.len>0))
+					OutCenteringPnt.write(HSyncData_d1);
+				HSyncData_d1 = InData;
+				LazerWinX_d1 = InData.LazerWinX - RGN_DATA_WIN_SIZE;
+
+				pkRng_S = InData.RltvRdx.range(3,0) + RGN_DATA_WIN_SIZE/2;
+				pkRng_E = InData.RltvRdx.range(7,4) + RGN_DATA_WIN_SIZE/2;
+
 				linePk.start = 0;
 				linePk.len = 0;
 				linePk.value = 0;