` // Read the image cv::Mat img = cv::imread("meters.png"); // Display the original image cv::imshow("src", img); // Print the shape of the image std::cout -Go服务器开发

这段代码已经是C++代码了，但是缺少必要的头文件引用。以下是修改后的完整C++代码：

#include <opencv2/opencv.hpp>

int main()
{
    // Read the image
    cv::Mat img = cv::imread("meters.png");

    // Display the original image
    cv::imshow("src", img);

    // Print the shape of the image
    std::cout << img.size() << std::endl;

    // Convert color format from BGR to BGRA
    cv::Mat result;
    cv::cvtColor(img, result, cv::COLOR_BGR2BGRA);

    // Split channels of the original image
    cv::Mat B, G, R;
    cv::split(img, {B, G, R});

    // Threshold the Red channel to create the Alpha channel
    cv::Mat Alpha;
    cv::threshold(R, Alpha, 20, 150, cv::THRESH_BINARY);
    cv::imshow("thres", Alpha);

    // Split channels of the resulting image
    std::vector<cv::Mat> channels;
	cv::split(result, channels);
	cv::Mat& B2 = channels[0];
	cv::Mat& G2 = channels[1];
	cv::Mat& R2 = channels[2];
	cv::Mat& A2 = channels[3];

	// Assign the Alpha channel from the thresholding result
	A2 = Alpha;

	// Merge channels to get the final result
	cv:merge(channels, result);

	// Display the final result
	cv:imshow("result", result);
    
	// Wait for key press and then close windows
	cv:waitKey(0);
	return 0;
}

请注意，为了编译和运行此代码，您需要安装OpenCV库并将其正确配置到您的项目中。

内容由零声教学AI助手提供，问题来源于学员提问