From c419552002486ef45ba403afc6eeb145fc081275 Mon Sep 17 00:00:00 2001
From: catree <catree.catreus@outlook.com>
Date: Mon, 17 Oct 2016 00:01:08 +0200
Subject: [PATCH] Add images for tutorials on morphological operations to avoid
 possible confusion.

---
 .../erosion_dilatation/erosion_dilatation.rst    |  15 +++++++++++++++
 ...Morphology_1_Tutorial_Theory_Dilatation_2.png | Bin 0 -> 1558 bytes
 .../Morphology_1_Tutorial_Theory_Erosion_2.png   | Bin 0 -> 1533 bytes
 .../Morphology_2_Tutorial_Theory_Closing_2.png   | Bin 0 -> 1383 bytes
 .../Morphology_2_Tutorial_Theory_Opening_2.png   | Bin 0 -> 1341 bytes
 .../opening_closing_hats.rst                     |  13 ++++++++++++-
 6 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 doc/tutorials/imgproc/erosion_dilatation/images/Morphology_1_Tutorial_Theory_Dilatation_2.png
 create mode 100644 doc/tutorials/imgproc/erosion_dilatation/images/Morphology_1_Tutorial_Theory_Erosion_2.png
 create mode 100644 doc/tutorials/imgproc/opening_closing_hats/images/Morphology_2_Tutorial_Theory_Closing_2.png
 create mode 100644 doc/tutorials/imgproc/opening_closing_hats/images/Morphology_2_Tutorial_Theory_Opening_2.png

diff --git a/doc/tutorials/imgproc/erosion_dilatation/erosion_dilatation.rst b/doc/tutorials/imgproc/erosion_dilatation/erosion_dilatation.rst
index 5ba21f622e..4d7eedbf73 100644
--- a/doc/tutorials/imgproc/erosion_dilatation/erosion_dilatation.rst
+++ b/doc/tutorials/imgproc/erosion_dilatation/erosion_dilatation.rst
@@ -53,6 +53,14 @@ Dilation
 
 The background (bright) dilates around the black regions of the letter.
 
+To better grasp the idea and avoid possible confusion, in this another example we have inverted the original image such as the object in white is now the letter. We have performed two dilatations with a rectangular structuring element of size :math:`3x3`.
+
+  .. image:: images/Morphology_1_Tutorial_Theory_Dilatation_2.png
+     :alt: Left image: original image inverted, right image: resulting dilatation
+     :align: center
+
+The dilatation makes the object in white bigger.
+
 Erosion
 ^^^^^^^^
 
@@ -66,6 +74,13 @@ Erosion
      :alt: Erosion result - Theory example
      :align: center
 
+In the same manner, the corresponding image resulting of the erosion operation on the inverted original image (two erosions with a rectangular structuring element of size :math:`3x3`.
+
+  .. image:: images/Morphology_1_Tutorial_Theory_Erosion_2.png
+     :alt: Left image: original image inverted, right image: resulting erosion
+     :align: center
+
+The erosion makes the object in white smaller.
 
 Code
 ======
diff --git a/doc/tutorials/imgproc/erosion_dilatation/images/Morphology_1_Tutorial_Theory_Dilatation_2.png b/doc/tutorials/imgproc/erosion_dilatation/images/Morphology_1_Tutorial_Theory_Dilatation_2.png
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diff --git a/doc/tutorials/imgproc/opening_closing_hats/images/Morphology_2_Tutorial_Theory_Opening_2.png b/doc/tutorials/imgproc/opening_closing_hats/images/Morphology_2_Tutorial_Theory_Opening_2.png
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diff --git a/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.rst b/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.rst
index abe7b496fe..a09ea41b6d 100644
--- a/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.rst
+++ b/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.rst
@@ -31,7 +31,7 @@ In the previous tutorial we covered two basic Morphology operations:
    * Erosion
    * Dilation.
 
-Based on these two we can effectuate more sophisticated transformations to our images. Here we discuss briefly 05 operations offered by OpenCV:
+Based on these two we can effectuate more sophisticated transformations to our images. Here we discuss briefly 5 operations offered by OpenCV:
 
 Opening
 ---------
@@ -50,6 +50,12 @@ Opening
      :alt: Opening
      :align: center
 
+For the sake of clarity, we have performed the opening operation (:math:`7x7` rectangular structuring element) on the same original image but inverted such as the object in white is now the letter.
+
+  .. image:: images/Morphology_2_Tutorial_Theory_Opening_2.png
+     :alt: Left image: original image inverted, right image: resulting opening
+     :align: center
+
 Closing
 ---------
 
@@ -65,6 +71,11 @@ Closing
      :alt: Closing example
      :align: center
 
+On the inverted image, we have performed the closing operation (:math:`7x7` rectangular structuring element):
+
+  .. image:: images/Morphology_2_Tutorial_Theory_Closing_2.png
+     :alt: Left image: original image inverted, right image: resulting closing
+     :align: center
 
 Morphological Gradient
 ------------------------