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diff --git a/modules/calib3d/include/opencv2/calib3d.hpp b/modules/calib3d/include/opencv2/calib3d.hpp
index 9116491250..fecc3ae254 100644
--- a/modules/calib3d/include/opencv2/calib3d.hpp
+++ b/modules/calib3d/include/opencv2/calib3d.hpp
@@ -220,7 +220,7 @@ Z_w \\
 
 The following figure illustrates the pinhole camera model.
 
-![Pinhole camera model](pics/pinhole_camera_model.png)
+![Pinhole camera model](pics/pinhole_camera_model.png) { width=70% }
 
 Real lenses usually have some distortion, mostly radial distortion, and slight tangential distortion.
 So, the above model is extended as:
@@ -448,7 +448,7 @@ The inverse of an homogeneous transformation matrix is then:
 
 One can note that the inverse of a 3x3 rotation matrix is directly its matrix transpose.
 
-![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.png)
+![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.jpg) { width=70% }
 
 This figure summarizes the whole process. The object pose returned for instance by the @ref solvePnP function
 or pose from fiducial marker detection is this \f$ {}^{c}\mathbf{T}_o \f$ transformation.
@@ -1012,7 +1012,7 @@ Check @ref tutorial_homography "the corresponding tutorial" for more details
 
 /** @brief Finds an object pose \f$ {}^{c}\mathbf{T}_o \f$ from 3D-2D point correspondences:
 
-![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.png){ width=50% }
+![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.jpg){ width=50% }
 
 @see @ref calib3d_solvePnP
 
@@ -1085,7 +1085,7 @@ CV_EXPORTS_W bool solvePnP( InputArray objectPoints, InputArray imagePoints,
 
 /** @brief Finds an object pose \f$ {}^{c}\mathbf{T}_o \f$ from 3D-2D point correspondences using the RANSAC scheme to deal with bad matches.
 
-![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.png){ width=50% }
+![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.jpg){ width=50% }
 
 @see @ref calib3d_solvePnP
 
@@ -1147,7 +1147,7 @@ CV_EXPORTS_W bool solvePnPRansac( InputArray objectPoints, InputArray imagePoint
 
 /** @brief Finds an object pose \f$ {}^{c}\mathbf{T}_o \f$ from **3** 3D-2D point correspondences.
 
-![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.png){ width=50% }
+![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.jpg){ width=50% }
 
 @see @ref calib3d_solvePnP
 
@@ -1242,7 +1242,7 @@ CV_EXPORTS_W void solvePnPRefineVVS( InputArray objectPoints, InputArray imagePo
 
 /** @brief Finds an object pose \f$ {}^{c}\mathbf{T}_o \f$ from 3D-2D point correspondences.
 
-![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.png){ width=50% }
+![Perspective projection, from object to camera frame](pics/pinhole_homogeneous_transformation.jpg){ width=50% }
 
 @see @ref calib3d_solvePnP