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Add example image about distortion effect.
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‎modules/calib3d/doc/camera_calibration_and_3d_reconstruction.rst

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@@ -83,7 +83,14 @@ is extended as:
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:math:`k_6` are radial distortion coefficients.
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:math:`p_1` and
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:math:`p_2` are tangential distortion coefficients.
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Higher-order coefficients are not considered in OpenCV. In the functions below the coefficients are passed or returned as
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Higher-order coefficients are not considered in OpenCV.
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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`).
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.. image:: pics/distortion_examples.png
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:align: center
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In the functions below the coefficients are passed or returned as
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.. math::
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‎modules/calib3d/doc/pics/distortion_examples.png

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