Mat构造函数在openCV中声明错误

Question

我对Mat构造函数有疑问 在win7x32下运行，编译openCV 2.2.0（不管在这里？！）
例如，我有下一个主要代码，问题是：

int main(int argc, char *argv[]){
     const char* filename = "test.bmp";

     IplImage* img = cvLoadImage(filename, 1); // works OK
     cvShowImage("hello openCV", img); // works OK

     Mat image(img); // asserting HERE !
     //... the next is out of problem
     ...
     return 0;
}

这是console \ terminal输出：

OpenCV Error: Assertion failed ((((img) != __null && ((const IplImage*)(img))->nSize == sizeof(IplImage)) && ((IplImage*)img)->imageData != __null) && img->imageData != 0) in Mat, file D:\OpenCV-2.2.0\opencv\modules\core\src\matrix.cpp, line 427