fixed ~300 warnings under windows (had to hack gtest a bit)

modules/objdetect/src/datamatrix.cpp

@@ -253,7 +253,7 @@ static int decode(Sampler &sa, code &cc)
 
   for (i = 0; i < 64; i++)
     sum += sa.getpixel(1 + (i & 7), 1 + (i >> 3));
-  uint8 mean = sum / 64;
+  uint8 mean = (uint8)(sum / 64);
   for (i = 0; i < 64; i++) {
     b = (b << 1) + (sa.getpixel(pickup[i].x, pickup[i].y) <= mean);
     if ((i & 7) == 7) {

modules/objdetect/src/dotdetector.cpp

@@ -647,7 +647,7 @@ void DOTDetector::save( const std::string& filename ) const
     }
 }
 
-void DOTDetector::train( const string& _baseDirName, const TrainParams& _trainParams, bool _isAddImageAndGradientMask )
+void DOTDetector::train( const string& _baseDirName, const TrainParams& _trainParams, bool /*_isAddImageAndGradientMask*/ )
 {
     clear();
 

modules/objdetect/src/latentsvm.cpp

@@ -272,7 +272,7 @@ int searchObjectThreshold(const CvLSVMFeaturePyramid *H,
                           float scoreThreshold,
                           CvPoint **points, int **levels, int *kPoints, 
                           float **score, CvPoint ***partsDisplacement,
-                          int numThreads)
+                          int /*numThreads*/)
 {
     int opResult;
 
@@ -551,7 +551,7 @@ int searchObjectThresholdSomeComponents(const CvLSVMFeaturePyramid *H,
                                         const float *b, float scoreThreshold,
                                         CvPoint **points, CvPoint **oppPoints,
                                         float **score, int *kPoints,
-                                        int numThreads)
+                                        int /*numThreads*/)
 {
     int error = 0;
     int i, j, s, f, componentIndex;