a few more warnings fixed

modules/contrib/src/spinimages.cpp

@@ -1053,7 +1053,7 @@ private:
     /* filtering by geometric consistency */        
     for(int i = 0; i < matchesSize; ++i)
     {
-        size_t consistNum = 1;
+        int consistNum = 1;
         float gc = float_max;
         
         for(int j = 0; j < matchesSize; ++j)
@@ -1140,14 +1140,14 @@ private:
         }
 
     group_t allMatchesInds;
-    for(size_t i = 0; i < matchesSize; ++i)
+    for(int i = 0; i < matchesSize; ++i)
         allMatchesInds.insert(i);
     
     vector<float> buf(matchesSize);
     float *buf_beg = &buf[0];
     vector<group_t> groups;
     
-    for(size_t g = 0; g < matchesSize; ++g)
+    for(int g = 0; g < matchesSize; ++g)
     {        
         if (out) if (g % 100 == 0) *out << "G = " << g << endl;
 

tests/cv/src/acameracalibration.cpp

@@ -1405,7 +1405,7 @@ void CV_StereoCalibrationTest::run( int )
 		Size imgsize;
 		int total = 0;
 
-		for( size_t i = 0; i < nframes; i++ )
+		for( int i = 0; i < nframes; i++ )
 		{
 			Mat left = imread(imglist[i*2]);
 			Mat right = imread(imglist[i*2+1]);

tests/cv/src/achesscorners.cpp

@@ -322,7 +322,7 @@ bool CV_ChessboardDetectorTest::checkByGenerator()
 
     const Size sizes[] = { Size(6, 6), Size(8, 6), Size(11, 12),  Size(5, 4) };
     const size_t sizes_num = sizeof(sizes)/sizeof(sizes[0]);                
-    const size_t test_num = 16;    
+    const int test_num = 16;    
     int progress = 0;
     for(int i = 0; i < test_num; ++i)
     {          

tests/cv/src/tabruteforcematcher.cpp

@@ -66,7 +66,7 @@ void BruteForceMatcherTest::run( int )
     ts->printf( CvTS::LOG, "Matching without matrix multiplication time s: %f, us per pair: %f\n",
                genericMatcherTime*1e-6, genericMatcherTime/( descriptorsNumber*descriptorsNumber ) );
 
-    if( specMatches.size() != descriptorsNumber || genericMatches.size() != descriptorsNumber )
+    if( (int)specMatches.size() != descriptorsNumber || (int)genericMatches.size() != descriptorsNumber )
         ts->set_failed_test_info( CvTS::FAIL_INVALID_OUTPUT );
     for( int i=0;i<descriptorsNumber;i++ )
     {