diff --git a/lite/utils/cv/image_convert.cc b/lite/utils/cv/image_convert.cc
index 0bd8529dcc6..4c8e4802a49 100644
--- a/lite/utils/cv/image_convert.cc
+++ b/lite/utils/cv/image_convert.cc
@@ -465,6 +465,7 @@ inline void nv12_to_bgr(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       ptr_y1 += 2;
       ptr_y2 += 2;
       ptr_vu += 2;
+
       if (j + 1 < srcw) {
         *ptr_bgr2++ = b3;
         *ptr_bgr2++ = g3;
@@ -790,9 +791,11 @@ inline void nv21_to_bgr(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       g3 = g3 < 0 ? 0 : (g3 > 255) ? 255 : g3;
       b3 = b3 < 0 ? 0 : (b3 > 255) ? 255 : b3;
 
-      *ptr_bgr1++ = b1;
-      *ptr_bgr1++ = g1;
-      *ptr_bgr1++ = r1;
+      if (j + 1 < srcw) {
+        *ptr_bgr1++ = b1;
+        *ptr_bgr1++ = g1;
+        *ptr_bgr1++ = r1;
+      }
 
       *ptr_bgr2++ = b2;
       *ptr_bgr2++ = g2;
@@ -802,9 +805,11 @@ inline void nv21_to_bgr(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       ptr_y2 += 2;
       ptr_vu += 2;
 
-      *ptr_bgr2++ = b3;
-      *ptr_bgr2++ = g3;
-      *ptr_bgr2++ = r3;
+      if (j + 1 < srcw) {
+        *ptr_bgr2++ = b3;
+        *ptr_bgr2++ = g3;
+        *ptr_bgr2++ = r3;
+      }
     }
   }
   LITE_PARALLEL_COMMON_END();
@@ -1130,10 +1135,12 @@ inline void nv12_to_bgra(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       g3 = g3 < 0 ? 0 : (g3 > 255) ? 255 : g3;
       b3 = b3 < 0 ? 0 : (b3 > 255) ? 255 : b3;
 
-      *ptr_bgr1++ = b1;
-      *ptr_bgr1++ = g1;
-      *ptr_bgr1++ = r1;
-      *ptr_bgr1++ = 255;
+      if (j + 1 < srcw) {
+        *ptr_bgr1++ = b1;
+        *ptr_bgr1++ = g1;
+        *ptr_bgr1++ = r1;
+        *ptr_bgr1++ = 255;
+      }
 
       *ptr_bgr2++ = b2;
       *ptr_bgr2++ = g2;
@@ -1144,10 +1151,12 @@ inline void nv12_to_bgra(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       ptr_y2 += 2;
       ptr_vu += 2;
 
-      *ptr_bgr2++ = b3;
-      *ptr_bgr2++ = g3;
-      *ptr_bgr2++ = r3;
-      *ptr_bgr2++ = 255;
+      if (j + 1 < srcw) {
+        *ptr_bgr2++ = b3;
+        *ptr_bgr2++ = g3;
+        *ptr_bgr2++ = r3;
+        *ptr_bgr2++ = 255;
+      }
     }
   }
   LITE_PARALLEL_COMMON_END();
@@ -1473,10 +1482,12 @@ inline void nv21_to_bgra(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       g3 = g3 < 0 ? 0 : (g3 > 255) ? 255 : g3;
       b3 = b3 < 0 ? 0 : (b3 > 255) ? 255 : b3;
 
-      *ptr_bgr1++ = b1;
-      *ptr_bgr1++ = g1;
-      *ptr_bgr1++ = r1;
-      *ptr_bgr1++ = 255;
+      if (j + 1 < srcw) {
+        *ptr_bgr1++ = b1;
+        *ptr_bgr1++ = g1;
+        *ptr_bgr1++ = r1;
+        *ptr_bgr1++ = 255;
+      }
 
       *ptr_bgr2++ = b2;
       *ptr_bgr2++ = g2;
@@ -1487,10 +1498,12 @@ inline void nv21_to_bgra(const uint8_t* src, uint8_t* dst, int srcw, int srch) {
       ptr_y2 += 2;
       ptr_vu += 2;
 
-      *ptr_bgr2++ = b3;
-      *ptr_bgr2++ = g3;
-      *ptr_bgr2++ = r3;
-      *ptr_bgr2++ = 255;
+      if (j + 1 < srcw) {
+        *ptr_bgr2++ = b3;
+        *ptr_bgr2++ = g3;
+        *ptr_bgr2++ = r3;
+        *ptr_bgr2++ = 255;
+      }
     }
   }
   LITE_PARALLEL_COMMON_END();