From 445022682e98e996dd2139557d6c62d14811b246 Mon Sep 17 00:00:00 2001
From: Alexander Smorkalov <2536374+asmorkalov@users.noreply.github.com>
Date: Thu, 27 Jun 2024 19:11:05 +0300
Subject: [PATCH] Merge pull request #25789 from
 asmorkalov:as/HAL_meanStdDev_tails

Fill mean and stdDev tails with zeros for HAL branch in meanStdDev #25789

as it's done for other branches.

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
---
 modules/core/src/mean.dispatch.cpp | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/modules/core/src/mean.dispatch.cpp b/modules/core/src/mean.dispatch.cpp
index b6ea926255..52c0954ff8 100644
--- a/modules/core/src/mean.dispatch.cpp
+++ b/modules/core/src/mean.dispatch.cpp
@@ -544,6 +544,10 @@ void meanStdDev(InputArray _src, OutputArray _mean, OutputArray _sdv, InputArray
         int dcn = (int)mean_mat.total();
         CV_Assert( mean_mat.type() == CV_64F && mean_mat.isContinuous() &&
                    (mean_mat.cols == 1 || mean_mat.rows == 1) && dcn >= cn );
+
+        double* dptr = mean_mat.ptr<double>();
+        for(k = cn ; k < dcn; k++ )
+            dptr[k] = 0;
     }
 
     if (_sdv.needed())
@@ -555,6 +559,11 @@ void meanStdDev(InputArray _src, OutputArray _mean, OutputArray _sdv, InputArray
         int dcn = (int)stddev_mat.total();
         CV_Assert( stddev_mat.type() == CV_64F && stddev_mat.isContinuous() &&
                    (stddev_mat.cols == 1 || stddev_mat.rows == 1) && dcn >= cn );
+
+        double* dptr = stddev_mat.ptr<double>();
+        for(k = cn ; k < dcn; k++ )
+            dptr[k] = 0;
+
     }
 
     if (src.isContinuous() && mask.isContinuous())
@@ -646,23 +655,17 @@ void meanStdDev(InputArray _src, OutputArray _mean, OutputArray _sdv, InputArray
     if (_mean.needed())
     {
         const double* sptr = s;
-        int dcn = (int)mean_mat.total();
         double* dptr = mean_mat.ptr<double>();
         for( k = 0; k < cn; k++ )
             dptr[k] = sptr[k];
-        for( ; k < dcn; k++ )
-            dptr[k] = 0;
     }
 
     if (_sdv.needed())
     {
         const double* sptr = sq;
-        int dcn = (int)stddev_mat.total();
         double* dptr = stddev_mat.ptr<double>();
         for( k = 0; k < cn; k++ )
             dptr[k] = sptr[k];
-        for( ; k < dcn; k++ )
-            dptr[k] = 0;
     }
 }