c++ - 矩阵在任何运算符后变得相同

Question

我有一个名为 BasePoint 的类

BasePoint
{
public:
    BasePoint();
    //BasePoint(const BasePoint& bp);
    uint id;
    float avgVal;
    float varVal;
    float avgLas;
    float varLas;
    cv::Mat invariants;// Type : 32FC1
    int status;
};

并且有这个类的 2 个对象:

BasePoint previousBasePoint;
BasePoint currentBasePoint;

在我执行的每一次迭代中

const float norm_factor = 1.0;
currentBasePoint.invariants = totalInvariants / norm_factor; // Problem is here
currentBasePoint.id = image_counter;

if(previousBasePoint.id == 0)
{
     previousBasePoint = currentBasePoint;
     currentPlace->members.push_back(currentBasePoint);
     wholebasepoints.push_back(currentBasePoint);
}
else
{
     //some code here
}

代码的问题是，当我执行 totalInvariants/norm_factor; 而不是使用 totalInvariants 时，previousBasePoint 变得与 相同当前基点。但是，如果我不划分它，一切正常。这可能是什么问题？

编辑:

const float norm_factor = 1.0;
currentBasePoint.invariants = totalInvariants;
currentBasePoint.invariants = currenBasePoint.invariants / norm_factor

也可以，但我还是想知道除法有什么问题

Answer 1

您正在 cv::Mat 上使用 = opeartor，它使用浅拷贝操作。所以它们都会有相同的内存地址，你需要使用cv::Mat的clone()操作。

此外，您还需要将 BasePoint 的 = 运算符重载为 previousBasePoint = currentBasePoint; 上的默认运算符，这也会对内部 invariant 进行浅拷贝>.