ImageOperator class

main.cpp

class ImageOperator{
public:
    ImageOperator() = default;
    ~ImageOperator() = default;
    
    static void to_gray_m1(const cv::Mat& input, cv::Mat& output);
    static void to_gray_m2(const cv::Mat& input, cv::Mat& output);
    static void to_gray_m3(const cv::Mat& input, cv::Mat& output);
    static void to_gray(const unsigned char* input,
                        const int width,
                        const int height,
                        const int channel,
                        unsigned char* output);
};