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Patch Code is a barcode developed by Kodak for use in automated scanning. ==Symbology== A Patch Code consists of two wide bars ( ± ) and two narrow bars (). The bars are separated by three narrow spaces, so the Patch Code symbols are a fixed length. There are six distinct permutations of the wide and narrow bars, so there are six Patch Codes.〔Choose(4,2)=4!/2!2! = 6〕 The patches are called: *Patch 2, WNNW, assigns image level 2 to the current document *Patch 3, WNWN, assigns image level 3 to the current document *Patch T, NWNW, assigns predefined image level to the next document (transfer patch) *Patch 1, WWNN, used for post scan image control *Patch 4, NWWN, used for post scan image control (toggle patch) *Patch 6, NNWW, used for post scan image control The Patch Code needs to be in a specific position on the page, but that position may vary with the image scanner used. The Patch Code is usually close to feed edge of the scanner. That way, the Patch Code can be detected early during the paper transport. Patch Codes are often printed along all four edges of a page. That covers the requirements for many scanners, and it allows the pages to work even if the page is upside down (rotated 180 degrees). Sometimes, the Patch Code is the only information on a page. That is, the page is only used for controlling a scan. In that situation, the scanner may just take the required action and not transfer the Patch Code image to the computer. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Patch Code」の詳細全文を読む スポンサード リンク
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