如何修复aforge.net上指定的无效图像大小

Question

我有一个使用aforge.net的项目，我有点面临问题。 我总是得到无效的图像大小指定的异常，我不知道为什么。 如果有人能帮助我，那就太好了......

这是我的代码：

private void videoSourcePlayer_NewFrame(object sender, ref Bitmap image)
    {

        string filepath = @"C:\Users\RLNGSTRDRGNTR\Documents\Visual Studio 2010\Projects\PengenalanPlatAccordNet\PengenalanPlatAccordNet\plat.JPG";
        Bitmap imageContoh = new Bitmap(System.Drawing.Image.FromFile(filepath, true));

        UnmanagedImage unImage = UnmanagedImage.FromManagedImage(imageContoh);
        UnmanagedImage clone = unImage.Clone();
        ResizeBilinear resize = new ResizeBilinear(512, 512);
        imageUntukDiproses = resize.Apply(clone);
        if (imageUntukDiproses != null)
        {
            //Preprosessing gambar
            PreProcessing pre = new PreProcessing(imageUntukDiproses);
            UnmanagedImage hasilPre = pre.HasilPreProcessing;
            UnmanagedImage grayscale = pre.GambarGrayscale;
            //penentuan lokasi plat
            PenentuLokasiPlat plat = new PenentuLokasiPlat(hasilPre, grayscale);

            //ekstraksi plat
            UnmanagedImage platfix = plat.PlatKendaraan;
            plat.Drawing(image);

            //tampilan histogram untuk hasil preprosessing
            histogram1.Values = plat.Hishorlogic;
            histogram3.Values = plat.Hisverlogic;


            if (platfix != null)
            {
                SegmentasiHuruf segmen = new SegmentasiHuruf(platfix);
                byte[,] ciripertama = segmen.Karakter[1];
                this.Invoke(new MethodInvoker(delegate() { dataGridView1.DataSource = new ArrayDataView(ciripertama); }));

                //Menampilkan image hasil
            }

        }
        Bitmap gambar = imageUntukDiproses.ToManagedImage();
        image = gambar;
    }

关于异常，我看到图像为空..