Image primaryImage = Image.FromFile(fileName); Bitmap pImg = MakeGrayscale3((Bitmap)primaryImage); using (ZBar.ImageScanner scanner = new ZBar.ImageScanner()) { List<ZBar.Symbol> symbols = new List<ZBar.Symbol>(); System.Diagnostics.

mnist数据集的导入文件，官网上有可能进不去(def maybe_download(filename, work_directory): """Download the data from Yann's website, unless it's already here.""")