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::: 可授權專利

人眼不易查覺的電子簽章方法 (Invisible electronic signature)

創作型式：
發明
專利證號：
US6813710B1
發明人：
徐道義、吳匡時
國別：
美國
獲證日期：
2004/11/02
專利摘要：
A method of producing an invisible electronic signature insusceptible to human damages or anamorphous compression. This new electronic signature technology uses the pixel contrast, error propagation, channel coding and cross encoding techniques. Once the electronic signature is embedded, it can still be recovered and recognized even after the generated image is damaged by human errors or anamorphous compression.
IPC國際分類號：
H04L000906