Image steganography system featuring perceptually adaptive and globally scalable signal embedding
Data embedding employing degenerate clusters of data having differences less than noise value Patent #: 5819289
ApplicationNo. 907157 filed on 08/06/1997
US Classes:380/28, PARTICULAR ALGORITHMIC FUNCTION ENCODING382/169With a gray-level transformation (e.g., uniform density transformation)
ExaminersPrimary: Swann, Tod R.
Assistant: Coddington, Trevor Quick
Attorney, Agent or Firm
International ClassH04N 007/167
AbstractA method of encryption features the steps of first encrypting a message and then hiding (embedding) it within a digital image carrier. This is accomplished by only slightly changing the gray levels of the image carrier. The changes are imperceptible to the human eye, because they appear as random thermal noise that is commonly present in digitized images.
Field of SearchPARTICULAR ALGORITHMIC FUNCTION ENCODING
Block/data stream enciphering
Data stream/substitution enciphering
Key sequence signal combined with data signal
BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY)
With a gray-level transformation (e.g., uniform density transformation)
Gray level to binary coding