Title:
IMAGE PROCESSOR, IMAGE PROCESSING METHOD AND STORAGE MEDIUM
Document Type and Number:
Japanese Patent JP3884891
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accurately extract electronic watermark information as much as possible by analogizing a state of image data to which no information is embedded from image data to which the electronic watermark information is embedded.
SOLUTION: This image processor, that can extract electronic watermark information from image data in which electronic watermark information is embedded in an invisible way to human, is provided with a 1st extract means that extracts 1st information introducing the electronic watermark information by using a 1st pattern arrangement to apply an arithmetic processing to the image data, a 2nd extract means that extracts 2nd information denoting a state of the image data to which no information is imbedded by using a 2nd pattern arrangement to apply an arithmetic processing to the image data, and a detection means that detects the reliability of the 1st information extracted by the 1st extract means on the basis of the 2nd information.
Inventors:
Murakami Tomochi
Junichi Hayashi
Junichi Hayashi
Application Number:
JP29816999A
Publication Date:
February 21, 2007
Filing Date:
October 20, 1999
Export Citation:
Assignee:
Canon Inc
International Classes:
G06F12/14; H04N1/387; G06F21/10; G06F21/16; G06F21/60; G06T1/00; (IPC1-7): H04N1/387; G06F12/14; G06T1/00
Domestic Patent References:
| JP10240626A | ||||
| JP10285562A |
Foreign References:
| WO1999012347A1 |
Attorney, Agent or Firm:
Keizo Nishiyama
Yuichi Uchio
Yuichi Uchio