Extracting embedded information from digital image data

• US 20050033965A1
• Filed: 09/03/2004
• Published: 02/10/2005
• Est. Priority Date: 01/30/1998
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Iwamura, Keiichi
• Granted Patent: US 7,206,432 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06T 1/0071 using multiple or alternating watermarks
• CPC Class Codes: G06T 2201/0051 Embedding of the watermark in the spatial domain
• CPC Class Codes: G06T 2201/0052 Embedding of the watermark in the frequency domain
• CPC Class Codes: G06T 2201/0061 Embedding of the watermark in each block of the image, e.g. segmented watermarking
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 1/32149 Methods relating to embedding, encoding, decoding, detection or retrieval operations
• CPC Class Codes: H04N 1/32352 Controlling detectability or arrangements to facilitate detection or retrieval of the embedded information, e.g. using markers for decoding, detection or retrieval operations H04N1/32149 and subgroups take precedence
• CPC Class Codes: H04N 2201/3233 of authentication information, e.g. digital signature, watermark
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes

Abstract

An extracting apparatus extracts first information from image data, the first information being embedded in the image data in accordance with a first embedding method which uses publicly available information. A first extracting unit extracts third information including the first information and second information from the image data, the third information being embedded in the image data in accordance with a second embedding method which uses secret information that is not made publicly available, and a second extracting unit extracts the first information from the third information.

Claims

1-34. -34. (Canceled)

35. An extracting apparatus that extracts first information from image data, the first information being embedded in the image data in accordance with a first embedding method which uses publicly available information, the apparatus comprising:

a first extracting unit adapted to extract third information from the image data, the third information including the first information and second information being embedded in the image data in accordance with a second embedding method which uses secret information that is not made publicly available; and

a second extracting unit adapted to extract the first information from the third information.

36. An extracting apparatus according to claim 35, wherein the second information is used to detect whether or not the first information is altered.

37. An extracting apparatus according to claim 35, wherein the second information is used to recover alternation of the first information.

38. An extracting apparatus according to claim 35, wherein the first information includes information relating to a copyright of the image data.

39. An extracting apparatus according to claim 35, wherein the first information is embedded in a first area of the image data, and the second information is embedded in a second area of the image data.

40. An extracting apparatus according to claim 35, wherein the first information and the second information are invisibly embedded in the image data.

41. An extracting method of extracting first information from image data, the first information being embedded in the image data in accordance with a first embedding method which uses publicly available information, the extracting method comprising:

a first extracting step of extracting third information from the image data, the third information including the first information and second information being embedded in the image data in accordance with a second embedding method which uses secret information that is not made publicly available; and

a second extracting step of extracting the first information from the third information.

42. An extracting method according to claim 41, wherein the second information is used to detect whether or not the first information is altered.

43. An extracting method according to claim 41, wherein the second information is used to recover alteration of the first information.

44. An extracting method according to claim 41, wherein the first information includes information relating to a copyright of the image data.

45. An extracting method according to claim 41, wherein the first information is embedded in a first area of the image data, and the second information is embedded in a second area of the image data.

46. An extracting method according to claim 41, wherein the first information and the second information are invisibly embedded in the image data.

47. A storage medium that stores a program for performing an extracting method of extracting first information from image data, the first information being embedded in the image data in accordance with a first embedding method which uses publicly available information, the extracting method comprising:

a first extracting step of extracting third information from the image data, the third information including the first information and second information being embedded in the image data in accordance with a second embedding method which uses secret information that is not made publicly available; and

a second extracting step of extracting the first information from the third information.

48. A storage medium according to claim 47, wherein the second information is used to detect whether or not the first information is altered.

49. A storage medium according to claim 47, wherein the second information is used to recover alternation of the first information.

50. A storage medium according to claim 47, wherein the first information includes information relating to a copyright of the image data.

51. A storage medium according to claim 47, wherein the first information is embedded in a first area of the image data, and the second information is embedded in a second area of the image data.

52. A storage medium according to claim 47, wherein the first information and the second information are invisibly embedded in the image data.