// YUV422转灰度图
            int grayBytes = videoIn->width * videoIn->height;
            unsigned char* grayBuf = new unsigned char [grayBytes];
            for (int i = 0; i < grayBytes; ++i)
            {
                grayBuf[i] = videoIn->framebuffer[i * 2];
            }

            // 灰度图转Mat
            int myw = videoIn->width;
            int myh = videoIn->height;
            Mat temp = Mat(myh, myw, CV_8U, Scalar::all(0));
            // 循环赋值
            for (int i = 0; i < myh; i++) {
                for (int j = 0; j < myw; j++) {
                    temp.at<uchar>(i, j) = *(grayBuf + j + width * i);
                }
            }
            imwrite("abc.bmp", temp);

            delete [] grayBuf;