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A quiet zone is an area of blank space on either side of a barcode that tells the scanner where the symbology starts and stops.
[TypeConverter(typeof(ExpandableObjectConverter))]
public QuietZone QuietZone { get; set; }
If the quiet zone is empty and AutoSize is true, the default value will be used for the specified barcode. The default value depends on the CodeType, for example, QRCode have a quiet zone of four blocks wide, while DataMatrix have quiet zone of only one block wide.