diff --git a/src/common.h b/src/common.h
index 3b3b437..1dbdc87 100644
--- a/src/common.h
+++ b/src/common.h
@@ -37,7 +37,7 @@ using namespace std;
 using namespace std::filesystem;
 
 #define BUF_SZ  10
-#define APP_VER "1.4.t8"
+#define APP_VER "1.4.t9"
 
 struct shared_t
 {
diff --git a/src/mo_detect.cpp b/src/mo_detect.cpp
index 251a93d..1ec2d20 100644
--- a/src/mo_detect.cpp
+++ b/src/mo_detect.cpp
@@ -31,9 +31,9 @@ void secDiff(const Mat &imgA, const Mat &imgB, int rows, int cols, int rowOffs,
 {
     auto pnts = 0;
 
-    for (auto y = rowOffs; y < rows; y++)
+    for (auto y = rowOffs; y < (rowOffs + rows); y++)
     {
-        for (auto x = colOffs; x < cols; x++)
+        for (auto x = colOffs; x < (colOffs + cols); x++)
         {
             auto pixA = imgA.at<uchar>(Point(x, y));
             auto pixB = imgB.at<uchar>(Point(x, y));