c++ yuv422怎么转化为raw8_mono，怎么实现

将YUV422转换为RAW8_MONO需要先将YUV422转换为灰度图像，然后再将灰度图像转换为RAW8_MONO。下面是一个简单的C++代码示例：

#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

void yuv422_to_gray(unsigned char* yuv, unsigned char* gray, int width, int height)
{
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j += 2) {
            int y1 = yuv[i * width * 2 + j * 2];
            int y2 = yuv[i * width * 2 + j * 2 + 2];
            gray[i * width + j] = y1;
            gray[i * width + j + 1] = y2;
        }
    }
}

void gray_to_raw8_mono(unsigned char* gray, unsigned char* raw, int width, int height)
{
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            raw[i * width + j] = gray[i * width + j];
        }
    }
}

int main()
{
    // 读取YUV422数据
    ifstream fin("input.yuv", ios::binary);
    int width = 640;
    int height = 480;
    int size = width * height * 2;
    unsigned char* yuv = new unsigned char[size];
    fin.read((char*)yuv, size);
    fin.close();

    // 将YUV422转换为灰度图像
    unsigned char* gray = new unsigned char[width * height];
    yuv422_to_gray(yuv, gray, width, height);

    // 将灰度图像转换为RAW8_MONO
    unsigned char* raw = new unsigned char[width * height];
    gray_to_raw8_mono(gray, raw, width, height);

    // 保存RAW8_MONO数据
    ofstream fout("output.raw", ios::binary);
    fout.write((char*)raw, width * height);
    fout.close();

    delete[] yuv;
    delete[] gray;
    delete[] raw;

    return 0;
}

以上代码仅供参考，实际应用中需要根据具体情况进行修改和优化。