Fix spelling typos

backport commit 659ffaddb4

modules/calib3d/include/opencv2/calib3d.hpp

@@ -1218,7 +1218,7 @@ struct CV_EXPORTS_W_SIMPLE CirclesGridFinderParameters2 : public CirclesGridFind
     CV_WRAP CirclesGridFinderParameters2();
 
     CV_PROP_RW float squareSize; //!< Distance between two adjacent points. Used by CALIB_CB_CLUSTERING.
-    CV_PROP_RW float maxRectifiedDistance; //!< Max deviation from predicion. Used by CALIB_CB_CLUSTERING.
+    CV_PROP_RW float maxRectifiedDistance; //!< Max deviation from prediction. Used by CALIB_CB_CLUSTERING.
 };
 
 /** @brief Finds centers in the grid of circles.

modules/calib3d/src/calibration.cpp

@@ -48,7 +48,7 @@
 #include <iterator>
 
 /*
-    This is stright-forward port v3 of Matlab calibration engine by Jean-Yves Bouguet
+    This is straight-forward port v3 of Matlab calibration engine by Jean-Yves Bouguet
     that is (in a large extent) based on the paper:
     Z. Zhang. "A flexible new technique for camera calibration".
     IEEE Transactions on Pattern Analysis and Machine Intelligence, 22(11):1330-1334, 2000.

modules/calib3d/test/test_chesscorners_badarg.cpp

@@ -115,7 +115,7 @@ void CV_ChessboardDetectorBadArgTest::run( int /*start_from */)
 
     img = cb.clone();
     pattern_size = Size(2,2);
-    errors += run_test_case( CV_StsOutOfRange, "Invlid pattern size" );
+    errors += run_test_case( CV_StsOutOfRange, "Invalid pattern size" );
 
     pattern_size = cbg.cornersSize();
     cb.convertTo(img, CV_32F);