[opencv] 14/89: Add example image about distortion effect.

[Nobuhiro Iwamatsu]

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iwamatsu pushed a commit to annotated tag 2.4.13.2
in repository opencv.

commit 1c409abe9c04b0b03cbafedee07e33190fdb30ab
Author: catree <catree.catreus at outlook.com>
Date:   Mon Oct 17 00:18:41 2016 +0200

    Add example image about distortion effect.
---
 .../doc/camera_calibration_and_3d_reconstruction.rst    |   9 ++++++++-
 modules/calib3d/doc/pics/distortion_examples.png        | Bin 0 -> 36227 bytes
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst b/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst
index 29b458e..9d3f1f2 100644
--- a/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst
+++ b/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst
@@ -83,7 +83,14 @@ is extended as:
 :math:`k_6` are radial distortion coefficients.
 :math:`p_1` and
 :math:`p_2` are tangential distortion coefficients.
-Higher-order coefficients are not considered in OpenCV. In the functions below the coefficients are passed or returned as
+Higher-order coefficients are not considered in OpenCV.
+
+The next figure shows two common types of radial distortion: barrel distortion (typically :math:`k_1 > 0` and pincushion distortion (typically :math:`k_1 < 0`).
+
+.. image:: pics/distortion_examples.png
+    :align: center
+
+In the functions below the coefficients are passed or returned as
 
 .. math::
 
diff --git a/modules/calib3d/doc/pics/distortion_examples.png b/modules/calib3d/doc/pics/distortion_examples.png
new file mode 100644
index 0000000..4650d44
Binary files /dev/null and b/modules/calib3d/doc/pics/distortion_examples.png differ

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