运行 valgrind，我在 opencv 中遇到大量内存泄漏，尤其是使用namedWindow 函数时。
总的来说，我有一个图像 CSImg 和 PGImg：
std::string cs = "Computer Science Students";
std::string pg = "Politics and Government Students";
CSImg.displayImage(cs);
cv::destroyWindow(cs);
PGImg.displayImage(pg);
cv::destroyWindow(pg);
显示图像函数为：
void ImageHandler::displayImage(std::string& windowname){
namedWindow(windowname);
imshow(windowname, m_image);
waitKey(7000);
}
当我显示图像时，Valgrind 给我带来了巨大的内存泄漏。
例如：
==6561== 2,359,544 bytes in 1 blocks are possibly lost in loss record 3,421 of 3,421
==6561== at 0x4C2B3F8: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6561== by 0x4F6C94C: cv::fastMalloc(unsigned long) (in /usr/lib/libopencv_core.so.2.3.1)
==6561== by 0x4F53650: cvCreateData (in /usr/lib/libopencv_core.so.2.3.1)
==6561== by 0x4F540F0: cvCreateMat (in /usr/lib/libopencv_core.so.2.3.1)
==6561== by 0x56435AF: cvImageWidgetSetImage(_CvImageWidget*, void const*) (in /usr/lib/libopencv_highgui.so.2.3.1)
==6561== by 0x5644C14: cvShowImage (in /usr/lib/libopencv_highgui.so.2.3.1)
==6561== by 0x5642AF7: cv::imshow(std::string const&, cv::_InputArray const&) (in /usr/lib/libopencv_highgui.so.2.3.1)
==6561== by 0x40CED7: ImageHandler::displayImage(std::string&) (imagehandler.cpp:33)
==6561== by 0x408CF5: main (randomU.cpp:601)
imagehandler.cpp，第33行是：
imshow(windowname, m_image); //the full function is written above ^
randomU.cpp 第 601 行是：
CSImg.displayImage(cs);
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