From a3a446c1975f416420f145a86fc10dfca099d741 Mon Sep 17 00:00:00 2001
From: Dmitry Kurtaev <dmitry.kurtaev+github@gmail.com>
Date: Tue, 17 Oct 2017 17:13:33 +0300
Subject: [PATCH] Output blobs shapes initialization in case of identity
 permutation (NCHW->NCHW)

---
 modules/dnn/src/layers/permute_layer.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/dnn/src/layers/permute_layer.cpp b/modules/dnn/src/layers/permute_layer.cpp
index 871c6779e1..fcebc9bb66 100644
--- a/modules/dnn/src/layers/permute_layer.cpp
+++ b/modules/dnn/src/layers/permute_layer.cpp
@@ -117,7 +117,10 @@ public:
                          std::vector<MatShape> &internals) const
     {
         if(!_needsPermute)
+        {
+            Layer::getMemoryShapes(inputs, requiredOutputs, outputs, internals);
             return true;
+        }
 
         CV_Assert(inputs.size() > 0);
         CV_Assert((int)_numAxes == inputs[0].size());
@@ -253,7 +256,11 @@ public:
         if(!_needsPermute)
         {
             for (k = 0; k < ninputs; k++)
-                outputs[k] = *inputs[k];
+            {
+                CV_Assert(outputs[k].total() == inputs[k]->total());
+                if (outputs[k].data != inputs[k]->data)
+                    inputs[k]->copyTo(outputs[k]);
+            }
         }
         else
         {