fix compilation under win

modules/objdetect/src/icf.cpp

@@ -56,7 +56,7 @@ void cv::SCascade::Channels::appendHogBins(const cv::Mat gray, std::vector<cv::M
     cv::Sobel(gray, df_dy, CV_32F, 0, 1);
 
     cv::cartToPolar(df_dx, df_dy, mag, angle, true);
-    mag *= (1.f / (8 * sqrt(2)));
+    mag *= (1.f / (8 * sqrt(2.f)));
 
     cv::Mat nmag;
     mag.convertTo(nmag, CV_8UC1);

modules/objdetect/src/softcascade.cpp

@@ -132,7 +132,7 @@ struct Level
        workRect(cv::Size(cvRound(w / (float)shrinkage),cvRound(h / (float)shrinkage))),
        objSize(cv::Size(cvRound(oct.size.width * relScale), cvRound(oct.size.height * relScale)))
     {
-        scaling[0] = ((relScale >= 1.f)? 1.f : (0.89f * pow(relScale, 1.099f / log(2)))) / (relScale * relScale);
+        scaling[0] = ((relScale >= 1.f)? 1.f : (0.89f * pow(relScale, 1.099f / log(2.f)))) / (relScale * relScale);
         scaling[1] = 1.f;
         scaleshift = relScale * (1 << 16);
     }