打开CV通用Mat函数头 [英] Open CV generic Mat function headers

问题描述

在OpenCV中，通常像这样访问Mat对象中的像素:

In OpenCV it's common to access a pixel in a Mat object like so:

float b = A.at<float>(4,5);

问题是，如果您不知道先验数据的类型，则会遇到麻烦.有没有一种方法可以编写接受模板类型为T的Mat的泛型函数标头?我想构建用于线性代数计算的函数，并且我不想使用if子句来分隔double和float.像这样:

The problem is, if you don't know the type of data apriori, you're stuck. Is there a way of writing generic function headers that accept a Mat with template type T? I'd like to build functions for linear algebra calculations, and I don't want to have an if clause separating double and float. Something like:

 void func(Mat <T> a) { 
     a.at<T>(3,4) = ...

在OpenCV中有可能吗?

Is this possible in OpenCV?

推荐答案

这可以通过简单地对您的函数进行模板操作来实现:

This is possible simply by templating your function :

template<typename T>
void func(Mat a) { 
    a.at<T>(3,4) = ...

但是请注意，没有简单的方法将T类型限制为double或float，并且您的算法可能不适用于其他类型，但这可能不是实际问题.

But note that you have no easy way to constraint the type T to be only double or float, and your algorithm won't probably work on other types, but it may not be an actual problem.

还要注意使用模板的缺点:使用模板的缺点是什么?

Also note the drawbacks of using templates : What are the disadvantages of using templates?

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