Remove useless C headers

The cvInvSqrt code replacement is taken from 5.x

modules/cnn_3dobj/include/opencv2/cnn_3dobj.hpp

@@ -66,7 +66,6 @@ the use of this software, even if advised of the possibility of such damage.
 
 #include "opencv2/viz/vizcore.hpp"
 #include "opencv2/highgui.hpp"
-#include "opencv2/highgui/highgui_c.h"
 #include "opencv2/imgproc.hpp"
 
 /** @defgroup cnn_3dobj 3D object recognition and pose estimation API

modules/cvv/src/qtutil/filter/sobelfilterwidget.cpp

@@ -1,7 +1,6 @@
 #include "sobelfilterwidget.hpp"
 
 #include "opencv2/imgproc.hpp"
-#include "opencv2/imgproc/types_c.h"
 
 #include <QVBoxLayout>
 #include <QLabel>

modules/dpm/src/dpm_cascade.cpp

@@ -62,7 +62,7 @@ void DPMCascade::loadCascadeModel(const string &modelPath)
     if (!is_success)
     {
         string errorMessage = format("Unable to parse the model: %s", modelPath.c_str());
-        CV_Error(CV_StsBadArg, errorMessage);
+        CV_Error(Error::StsBadArg, errorMessage);
     }
 
     model.initModel();

modules/dpm/src/dpm_feature.cpp

@@ -81,7 +81,7 @@ void ParalComputePyramid::initialize()
 
     if (params.maxScale < params.interval)
     {
-        CV_Error(CV_StsBadArg, "The image is too small to create a pyramid");
+        CV_Error(Error::StsBadArg, "The image is too small to create a pyramid");
         return;
     }
 

modules/dpm/src/dpm_feature.hpp

@@ -43,7 +43,6 @@
 #define __DPM_FEATURE__
 
 #include "opencv2/core.hpp"
-#include "opencv2/core/core_c.h"
 #include "opencv2/imgproc.hpp"
 
 #include <string>

modules/img_hash/src/precomp.hpp

@@ -8,7 +8,6 @@
 #include "opencv2/core.hpp"
 #include "opencv2/core/base.hpp"
 #include "opencv2/imgproc.hpp"
-#include "opencv2/imgproc/types_c.h"
 #include "opencv2/img_hash.hpp"
 
 #include <bitset>

modules/xfeatures2d/src/affine_feature2d.cpp

@@ -8,7 +8,6 @@
 
 #include "precomp.hpp"
 #include "opencv2/imgproc.hpp"
-#include "opencv2/imgproc/types_c.h"
 
 namespace {
 

modules/xphoto/samples/dct_image_denoising.cpp

@@ -4,7 +4,6 @@
 #include "opencv2/highgui.hpp"
 
 #include "opencv2/core/utility.hpp"
-#include "opencv2/imgproc/types_c.h"
 
 const char* keys =
 {

modules/xphoto/src/dct_image_denoising.cpp

@@ -47,10 +47,8 @@
 #include "opencv2/imgproc.hpp"
 
 #include "opencv2/core.hpp"
-#include "opencv2/core/core_c.h"
 
 #include "opencv2/core/types.hpp"
-#include "opencv2/core/types_c.h"
 
 namespace cv
 {
@@ -137,9 +135,9 @@ namespace xphoto
     {
         CV_Assert( src.type() == CV_MAKE_TYPE(CV_32F, 3) );
 
-        cv::Matx33f mt(cvInvSqrt(3.0f),  cvInvSqrt(3.0f),       cvInvSqrt(3.0f),
-                       cvInvSqrt(2.0f),  0.0f,                 -cvInvSqrt(2.0f),
-                       cvInvSqrt(6.0f), -2.0f*cvInvSqrt(6.0f),  cvInvSqrt(6.0f));
+        cv::Matx33f mt(pow(3.0f, -0.5f),  pow(3.0f, -0.5f),       pow(3.0f, -0.5f),
+                       pow(2.0f, -0.5f),  0.0f,                 -pow(2.0f, -0.5f),
+                       pow(6.0f, -0.5f), -2.0f*pow(6.0f, -0.5f),  pow(6.0f, -0.5f));
 
         cv::transform(src, dst, mt);
 
@@ -175,7 +173,7 @@ namespace xphoto
         else if ( img.type() == CV_32FC1 )
             grayDctDenoising( img, img, sigma, psize );
         else
-            CV_Error_( CV_StsNotImplemented,
+            CV_Error_( Error::StsNotImplemented,
             ("Unsupported source image format (=%d)", img.type()) );
 
         img.convertTo( dst, src.type() );