我正在尝试制作this OOP,所以我创建了一个实现轨道栏回调函数的类。
这是我的班级
class Contours
{
public:
static Mat src_gray;
static int thresh;
Contours(Mat, int);
~Contours(void);
static void callback(int, void* );
private:
};
Contours::Contours(Mat src_gray,int thresh){
this->src_gray=src_gray;
this->thresh=thresh;
}
Contours::~Contours(void){}
void Contours::callback(int, void*)
{int largest_area=0;
int largest_contour_index=0;
Mat canny_output;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;
/// Detect edges using canny
Canny( src_gray, canny_output, thresh, thresh*2, 3 );
/// Find contours
findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
/// Draw contours
Mat drawing = Mat::zeros( canny_output.size(), CV_8UC3 );
cout<<contours.size()<<endl;
for( int i = 0; i< contours.size(); i++ )
{
double a=contourArea( contours[i],false); // Find the area of contour
if(a>largest_area){
largest_area=a;
largest_contour_index=i; } //Store the index of largest contour
//Scalar color = Scalar(255,255,255 );
//drawContours( drawing, contours, i, color, 2, 8, hierarchy, 0, Point() );
}
cout<<"cnt maxim: "<<largest_contour_index<<endl;
Scalar color = Scalar(255,255,255 );
drawContours( drawing, contours, largest_contour_index, color, 2, 8, hierarchy, 0, Point() );
/// Show in a window
namedWindow( "Contours", CV_WINDOW_AUTOSIZE );
imshow( "Contours", drawing );
//imwrite("sada.png",drawing);
}
调用函数
createTrackbar( " Canny thresh:", "Source", &thresh, max_thresh, &Contours::callback );
我得到了
错误5错误LNK2001:未解析的外部符号“public:static class cv :: Mat Contours :: src_gray”(?src_gray @ Contours @@ 2VMat @ cv @@ A)D:\ Licenta \ Hand sign sign recognition \ Algoritmi。 obj手势识别
错误6错误LNK2001:未解析的外部符号“public:static int Contours :: thresh”(?thresh @ Contours @@ 2HA)D:\ Licenta \ Hand sign sign recognition \ Algoritmi.obj Hand sign recognition
任何想法为什么?
答案 0 :(得分:0)
可能对“静态回调”问题使用不同的方法:
class Contours
{
public:
Mat src_gray; // non-static
int thresh;
Contours(Mat, int);
void callback(int, void* ); // non-static
};
void callback(int value, void*ptr) // static global
{
Contours* cnt = (Contours*)ptr; // cast 'this'
cnt->callback(value,0); // call non-static member
}
int main()
{
Mat gray = ...
Contours cnt(gray,17);
// now pass the address of cnt as additional void* Ptr:
createTrackbar( " Canny thresh:", "Source", &thresh, max_thresh, callback, &cnt );
...