OpenCV(c)多通道元素访问

图像是CV_8UC3.

for (int i=0; i<image.rows; i++)
{
    for (int j=0; j<image.cols; j++)
    {
        if (someArray[i][j] == 0)
        {
            image.at<Vec3i>(i,j)[0] = 0;
            image.at<Vec3i>(i,j)[1] = 0;
            image.at<Vec3i>(i,j)[2] = 0;
        }
    }
}

它不起作用.我究竟做错了什么？？？

谢谢！