首先將水印資訊進行PDF417編碼，並在密鑰控制下進行混沌序列置亂後得到二值水印圖像；
Meanwhile, an error correction coding and decoding table-checking method suitable to PDF417 was proposed, which could decide any code corresponding to the power of the element in GF (929).
同時提出一種適用於PDF417糾錯編碼和譯碼的查表方法，可以簡單確定任意碼字在GF(929)內所對應的本原元的冪次。
PDF417 code was examined with LS4804 scanning spear and auto-updated module data when material was moved out and checked.
Firstly, it can be obtained 2-value watermark image by PDF417 coding to watermark information and chaotic sequence scrambling.
