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Maksymalna pojemność kodu PDF417 to 1850 tekstów alfanumerycznych, 2710 cyfr dziesiętnych lub 1108 bajtów danych binarnych. Mechanizm korekcji błędów: W PDF417 używany jest algorytm korekcji błędów Reed-Solomon, który pozwala na odzyskanie danych nawet w przypadku uszkodzenia kodu.
11 sty 2024 · PDF417, rodzaj kodu kreskowego 2D, znany jest z dużej pojemności danych i niezawodności. W przeciwieństwie do tradycyjnych kodów kreskowych PDF417 może przechowywać obszerne informacje, w tym tekst, liczby, a nawet małe obrazy.
A PDF417 data (characters or bytes) may be converted to different codeword sequences, depending on how the PDF417 barcode generator program switches between compaction modes and sub-modes. There is no single specified way to encode data in a PDF417 barcode.
PDF417 is the standard selected by the Department of Homeland Security as the machine readable zone technology for RealID compliant driver licenses and state issued identification cards. PDF417 barcodes are also included on visas and border crossing cards issued by the State of Israel ( example ).
Barcode Guide. PDF417. You are here: Home > Barcode Symbologies > General-Purpose 2-D Stacked Symbologies > PDF417. PDF417 is a two-dimensional, variable-length stacked symbology that was developed in 1992 to encode large amounts of data in a small area.
Classification. PDF417 is a 2D barcode symbology (two-dimensional barcode) with very high data density. A single PDF417 symbol can be imagined as multiple linear bar-codes (called "rows") stacked above each other. This is the reason why the PDF417 symbology is sometimes called a "stacked linear symbology".
26 lis 2012 · Size Recomendations. As a general rule each column of a PDF-417 barcode should occupy around 50 pixels or more in an image, although it’s possible to go down to around 30 pixels and still achieve some success. Each row should be at least 7 pixels high.
