学习OpenCV3： DataType「Complexf」无法访问成员type和depth

落日映苍穹つ 2023-02-24 11:27 128阅读 0赞

# 1、背景 #

#include <iostream>
    using namespace std;
    #include <opencv2/opencv.hpp>
    using namespace cv;
    
    int main()
    {
        int rows = 5, cols = 5;
        Mat m = Mat::eye(rows, cols, DataType<Complexf>::type);
        for (size_t i = 0; i < rows; ++i)
        {
            for (size_t j = 0; j < cols; ++j)
            {
                cout << m.at<Complexf>(i, j).re << "," << m.at<Complexf>(i, j).im << "  ";
            }
            cout << endl;
        }
        cout << endl
             << DataType<Complexf>::depth << endl;
        return 0;
    }

> p70.cpp: In function ‘int main()’:  
> p70.cpp:9:54: error: ‘type’ is not a member of ‘cv::DataType<cv::Complex >’  
> Mat m = Mat::eye(rows, cols, DataType::type);  
> p70.cpp:18:33: error: ‘depth’ is not a member of ‘cv::DataType<cv::Complex >’  
> cout << DataType::depth << endl;

# 2、解决方法 #

打开DataType的定义可发现，DataType< Complex<\_Tp> >确实含有成员type和depth，但其要求`OPENCV_TRAITS_ENABLE_DEPRECATED`已定义。

template<typename _Tp> class DataType< Complex<_Tp> >
    {
    public:
        typedef Complex<_Tp> value_type;
        typedef value_type   work_type;
        typedef _Tp          channel_type;
    
        enum { generic_type = 0,
               channels     = 2,
               fmt          = DataType<channel_type>::fmt + ((channels - 1) << 8)
    #ifdef OPENCV_TRAITS_ENABLE_DEPRECATED
               ,depth        = DataType<channel_type>::depth
               ,type         = CV_MAKETYPE(depth, channels)
    #endif
        };
    
        typedef Vec<channel_type, channels> vec_type;
    };

**方法1：**  
  故可在打开`include/opencv2/core/traist.hpp`文件，将`// #define OPENCV_TRAITS_ENABLE_DEPRECATED`改为`#define OPENCV_TRAITS_ENABLE_DEPRECATED`

![修改前][format_png_pic_center]

![修改后][format_png_pic_center 1]

**方法2：**  
  按depth和type的定义修改程序，即将`DataType<Complexf>::depth`修改为`DataType<float>::depth`，将`DataType<Complexf>::type`修改为`CV_MAKETYPE(DataType<float>::depth, 2)`。

#include <iostream>
    using namespace std;
    #include <opencv2/opencv.hpp>
    using namespace cv;
    
    int main()
    {
        int rows = 5, cols = 5;
        Mat m = Mat::eye(rows, cols, CV_MAKETYPE(DataType<float>::depth, 2));
        for (size_t i = 0; i < rows; ++i)
        {
            for (size_t j = 0; j < cols; ++j)
            {
                cout << m.at<Complexf>(i, j).re << "," << m.at<Complexf>(i, j).im << "  ";
            }
            cout << endl;
        }
        cout << endl
             << DataType<float>::depth << endl;
        return 0;
    }

![运行结果][format_png_pic_center 2]

[format_png_pic_center]: /images/20230209/f0f07fd9108746089ed22781200fd9e4.png
[format_png_pic_center 1]: /images/20230209/27f93440f8af432082e4197ba43c99cb.png
[format_png_pic_center 2]: /images/20230209/482b49f4ec774379b675e936704dfbd5.png