cv::imshow() function call changes current locale

A call to cv::imshow() function changes current locale.

Here is a piece of code to reproduce the bug :

#include <cv.h>
#include <highgui.h>
#include <locale.h>

void getLocale(void)
{
 printf( "LC_ALL=%s\n", setlocale( LC_ALL, NULL));
 printf( "LC_NUMERIC=%s\n", setlocale( LC_NUMERIC, NULL));
}

int main(void)
{
 cv::Mat img( 480, 640, CV_8UC3);

 getLocale();
 printf( "atof(1.23)=%f\n", atof("1.23"));

 cv::imshow( "test", img);

 getLocale();
 printf( "atof(1.23)=%f\n", atof("1.23"));

 cv::waitKey(5);
}

The result on my computer (Ubuntu 12.04.2 LTS AMD64):

LC_ALL=C
LC_NUMERIC=C
atof(1.23)=1.230000
LC_ALL=fr_FR.UTF-8
LC_NUMERIC=fr_FR.UTF-8
atof(1.23)=1,000000