Patch types 1, 4 and 6 are not used for document separation but to enable other features such as colour or multifeed detection.Attached is the recommended Patch T Document Separator Sheet to be used for document separation during document scanning. Typically patch Type 2 is used for Document Separation, Type 3 for Batch Separation and Type T can be used for either Document or Batch Separation. The exact action taken on recognising a patch code will depend upon the system and software used, and may be configurable in a given application. It is possible to incorporate a patch code into a form (typically a Patch 2 code on the first page of the form), to indicate a new file should be started for each form. It is also possible to add conventional barcodes (typically Code 39) to a sheet to, for example, indicate the document type. Similarly although there may be 4 identical patch codes on a page (one in each orientation) patch code readers (hardware or software) would only ever return one. Note that no data is encoded in a patch code. A common use now is to use the Patch T code or the Patch 2 code as a Page (document) separator. Six distinct barcode patterns (Patch 1, 2, 3, 4, 6 and T) were defined. The different codes will signal certain events such as a page/section break or a change from single sided to duplex scanning. The patch code was originally created by Kodak to signal document processing applications while reading large documents. Some scanners (such as the Kodak i800) require the patch code to be printed parallel to the feed-edge, other scanners (such as the Kodak i5000) require the patch code to be perpendicular (at right angles) to the feed-edge.Ī typical use of a patch code is distinguish where one document ends and another begins when a pile of documents are loaded into the sheet-feeder (ADF) of a document scanner. For this reason patch codes are often printed on all four edges of the page. This will vary depending upon the model of scanner used, and the orientation of the page. Exactly what action is taken depends upon the design of any given system.Ī patch code needs to be printed in a certain position, usually near the leading edge (feed-edge) of the document. The patch code may be recognised by the scanner itself (more usually in the top-end expensive scanners) or by the scanning or processing software or with a TWAIN or ISIS driver. When scanning the document the patch code can be recognised and acted upon. Patch codes are a set of 6 distinct barcode patterns (1, 2, 3, 4, 6 and T) that are typically used as document separators when scanning.Ī patch code is a pattern of parallel, alternating black bars and spaces (a barcode) that is printed on a document.
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