From 03c4c37969d80ebaa50df32f6b3228380ded524b Mon Sep 17 00:00:00 2001
From: "KUANG, Fangjun" <csukuangfj@gmail.com>
Date: Wed, 22 Mar 2017 22:24:20 +0100
Subject: [PATCH] fix issue 8189.

---
 modules/core/src/matrix.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/core/src/matrix.cpp b/modules/core/src/matrix.cpp
index 135397aa7d..2e479f7c56 100644
--- a/modules/core/src/matrix.cpp
+++ b/modules/core/src/matrix.cpp
@@ -1395,7 +1395,7 @@ void _InputArray::getMatVector(std::vector<Mat>& mv) const
     {
         const std::vector<uchar>& v = *(const std::vector<uchar>*)obj;
 
-        size_t n = v.size(), esz = CV_ELEM_SIZE(flags);
+        size_t n = size().width, esz = CV_ELEM_SIZE(flags);
         int t = CV_MAT_DEPTH(flags), cn = CV_MAT_CN(flags);
         mv.resize(n);