问一下 关于emgucv Sub出现的问题

[归途醉染]

     private void Form1_Load(object sender, EventArgs e)
        {
            Image<Bgr, byte> imageOff = new Image<Bgr, byte>(@"D:\OpenCVpictrue\LED_0_153119.bmp");
            Image<Bgr, byte> imageLight = new Image<Bgr, byte>(@"D:\OpenCVpictrue\LED_1_153119.bmp");
            Image<Bgr, byte> imageSrc = null;
            try
            {
                /*Image<Bgr, byte>*/
                imageSrc = imageLight.Sub(imageOff);
                imageBox1.Image = imageSrc;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

这段代码出现错误为

[归途醉染]

图像在该路径
不存在没有图像的问题

[归途醉染]

.........没人?????????//