Data processing apparatus and method, and storage medium

• US 6,707,465 B2
• Filed: 02/08/2001
• Issued: 03/16/2004
• Est. Priority Date: 02/09/2000
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamazaki, Takeshi, Iwamura, Keiichi
• Primary Examiner(s): Bella, Matthew C.
• Assistant Examiner(s): Sajous, Wesner
• Application Number:
  US09/778,932
• Publication Number:
  US 20010012019A1
• Time in Patent Office: 1,132 Days
• Field of Search: 382/233, 382/232, 382/248, 382/250, 382/251, 382/100, 380/200-203, 380/232, 380/241, 380/253, 380/277, 380/278-285, 283/72-75, 283/100-107, 283/113, 705/5, 705/51, 705/57-59, 348/460, 345/629, 345/630, 345/632, 345/638, 345/844, 345/555, 345/556, 345/639, 345/641
• US Class Current: 345/629
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 2201/0065 Extraction of an embedded watermark; Reliable detection
• CPC Class Codes: G09G 5/39 Control of the bit-mapped memory

Abstract

This invention provides a technique capable of always keeping digital watermark information embedded in image data having the embedded digital watermark information by an optimum scheme on the basis of a time factor, or removing a digital watermark, or erasing the image data. An apparatus for achieving the above object has functions of holding image data having additional information embedded as a digital watermark, detecting time information related to the image data, and changing the embedding scheme for the additional information as the digital watermark embedded in the image data on the basis of the detected time information.

Claims

1. A data processing apparatus comprising:

holding means for holding image data having additional information embedded as a digital watermark;

detection means for detecting time information related to the image data; and

change means for changing an embedding scheme for the additional information as the digital mark, from an invisible watermarking scheme to a visible watermarking scheme, on the basis of the time information detected by said detection means.

2. The apparatus according to claim 1, further comprising embedding means for embedding the additional information into the image data as the digital watermark before the image data is held by said holding means.

3. The apparatus according to claim 1, wherein the time information contains current time information corresponding to a time of the detection.

4. The apparatus according to claim 1, wherein the time information contains information related to a time limit for use of the image data held by said holding means.

5. The apparatus according to claim 1, wherein an item of the time information is information embedded as a digital watermark in the image data held by said holding means.

6. The apparatus according to claim 1, wherein said change means changes the embedding scheme from a visible watermarking scheme to an invisible watermarking scheme.

7. A data processing apparatus comprising:

holding means for holding image data having additional information embedded as a digital watermark;

detection means for detecting time information related to the image data; and

change means for changing an embedding scheme for the additional information as the digital mark, from a first invisible watermarking scheme to a second invisible watermarking scheme, on the basis of the time information detected by said detection means.

8. A data processing apparatus comprising:

holding means for holding image data having additional information embedded as a digital watermark;

detection means for detecting time information related to the image data; and

change means for changing an embedding scheme for the additional information as the digital mark, from a first visible watermarking scheme to a second visible watermarking scheme, on the basis of the time information detected by said detection means.

9. A data processing method comprising:

a detection step of detecting time information related to image data having additional information embedded as a digital watermark; and

a change step of changing an embedding scheme for the additional information as the digital watermark, from a first invisible watermarking scheme to a second invisible watermarking scheme, on the basis of the time information detected at said detection step.

10. A computer-readable storage medium which stores a data processing program for executing a data processing method, said program comprising:

a detection step module for detecting time information related to image data having additional information embedded as a digital watermark; and

a change step module for changing an embedding scheme for the additional information as the digital watermark, from a first invisible watermarking scheme to a second invisible watermarking scheme, on the basis of the time information detected by said detection step module.

11. A data processing apparatus for extracting digital watermark information from digital data in which the watermark information is embedded by an apparatus having:

watermark embedding means for embedding watermark information to be embedded into the digital data; and

common watermark embedding means for embedding, into the digital data, version information for specifying a version of an embedding scheme used by said watermark embedding means, at high resiliency,

said data processing apparatus comprising;

common watermark extraction means for extracting the version information embedded by said common watermark embedding means;

specifying means for specifying, on the basis of the version information extracted by said common watermark extraction means, the version of the embedding scheme with which the watermark information is embedded into the digital data;

selection means for selecting watermark extraction means capable of extracting watermark information corresponding to the version specified by said specifying means; and

control means for controlling to extract the watermark information from the digital data using said watermark extraction means selected by said selection means.

12. A data processing apparatus for extracting watermark information from digital data in which the watermark information is embedded by an apparatus having:

watermark embedding means for embedding watermark information to be embedded into the digital data;

transformation means for performing discrete frequency transformation for the digital data;

embedding means for embedding version information for specifying a version of an embedding scheme used by said watermark embedding means at high resiliency, by quantizing a transform coefficient transformed by said transformation means; and

inverse transformation means for performing inverse transformation means for the digital data having the version information embedded by said embedding means,

said data processing apparatus comprising;

common watermark extraction means for extracting the version information embedded by said common watermark embedding means;

specifying means for specifying, on the basis of the version information extracted by said common watermark extraction means, the version of the embedding scheme with which the watermark information is embedded into the digital data;

selection means for selecting watermark extraction means capable of extracting watermark information corresponding to the version specified by said specifying means; and

control means for controlling to extract the watermark information from the digital data using said watermark extraction means selected by said selection means.

13. A data processing method of extracting watermark information from digital data in which the watermark information is embedded by a method having:

a watermark embedding step of embedding watermark information to be embedded into the digital data; and

a common watermark embedding step of embedding, into the digital data, version information for specifying a version of an embedding scheme used in the watermark embedding step, at high resiliency,

said data processing method comprising;

a common watermark extraction step of extracting the version information embedded in the common watermark embedding step;

a specifying step of specifying, on the basis of the version information extracted in the common watermark extraction step, the watermark embedding technique with which the watermark information is embedded into the digital data;

a selection step of selecting a watermark extraction technique for extracting watermark information corresponding to the watermark embedding technique specified in the specifying step; and

a control step of controlling to extract the watermark information from the digital data using the watermark extraction technique selected in the selection step.

14. A data processing method of extracting watermark information from digital data in which the watermark information is embedded by a method having:

a watermark embedding step of embedding watermark information to be embedded into the digital data;

a transformation step of performing discrete frequency transformation for the digital data;

an embedding step of embedding version information by quantizing a transform coefficient transformed in the transformation step; and

an inverse transformation step of performing inverse transformation of the transformation step for the digital data having the version information embedded at said embedding step,

said data processing method comprising;

a common watermark extraction step of extracting the version information embedded in the common watermark embedding step;

a specifying step of specifying, on the basis of the version information extracted in the common watermark extraction step, the watermark embedding technique with which the watermark information is embedded into the digital data;

a selection step of selecting a watermark extraction technique for extracting watermark information corresponding to the watermark embedding technique specified in the specifying step; and

a control step of controlling to extract the watermark information from the digital data using the watermark extraction technique selected in the selection step.

15. A computer-readable storage medium which stores a program for executing a data processing method of extracting watermark information from digital data in which the watermark information is embedded by a method having:

a watermark embedding step of embedding watermark information to be embedded into the digital data; and

a common watermark embedding step of embedding, into the digital data, version information for specifying a version of an embedding scheme used in the watermark embedding step, at high resiliency,

said program comprising;

a common watermark extraction step module for extracting the version information embedded by a common watermark embedding step module;

a specifying step module for specifying, on the basis of the version information extracted by said common watermark extraction step module, a watermark embedding technique with which the watermark information is embedded into the digital data;

a selection step module for selecting a watermark extraction technique for extracting watermark information corresponding to the watermark embedding technique specified by said specifying step module; and

a control step module for controlling to extract the watermark information from the digital data using the watermark extraction technique selected by said selection step module.

16. A data processing method comprising:

a detection step of detecting time information related to image data having additional information embedded as a digital watermark; and

a change step of changing an embedding scheme for the additional information as the digital mark, from an invisible watermarking scheme to a visible watermarking scheme, on the basis of the time information detected at said detection step.

17. A data processing method comprising:

a detection step of detecting time information related to the image data having additional information embedded as a digital watermark; and

a change step of changing an embedding scheme for the additional information as the digital mark, from a first visible watermarking scheme to a second visible watermarking scheme, on the basis of the time information detected at said detection step.

18. A computer-readable storage medium which stores a program for executing a data processing method of embedding a digital watermark into digital data, said program comprising:

a detection step module for detecting time information related to the image data having additional information embedded as a digital watermark; and

a change step module for changing an embedding scheme for the additional information as the digital mark, from an invisible watermarking scheme to a visible watermarking scheme, on the basis of the time information detected by said detection step module.

19. A computer-readable storage medium which stores a program for executing a data processing method of embedding a digital watermark into digital data, said program comprising:

a detection step module for detecting time information related to image data having additional information embedded as a digital watermark; and

a change step module for changing an embedding scheme for the additional information as the digital mark, from a first visible watermarking scheme to a second visible watermarking scheme, on the basis of the time information detected by said detection step module.

20. A computer-readable storage medium which stores a program for extracting watermark information from digital data in which the watermark information is embedded by an apparatus having

watermark embedding means for embedding watermark information to be embedded into the digital data;

and

common watermark embedding means for embedding, into the digital data, version information for specifying a version of an embedding scheme used by said watermark embedding means, at high resiliency, said program comprising;

a common watermark extraction step module for extracting the version information embedded by the common watermark embedding means;

a specifying step module for specifying, on the basis of the version information extracted by said common watermark extraction step module, the version of the embedding scheme with which the watermark information is embedded into the digital data;

a selection step module for selecting watermark extraction step module capable of extracting watermark information corresponding to the version specified by said specifying step module; and

a control step module for controlling to extract the watermark information from the digital data using said watermark extraction step module selected by said selection step module.