Encoding apparatus, decoding apparatus, encoding method, computer product, and printed material

• US 20070086060A1
• Filed: 02/27/2006
• Published: 04/19/2007
• Est. Priority Date: 10/13/2005
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Noda, Tsugio, Chiba, Hirotaka
• Application Number:
  US11/362,000
• Publication Number:
  US 20070086060A1
• Time in Patent Office: Days
• US Class Current: 358/3.280
• 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 2201/0061 Embedding of the watermark in each block of the image, e.g. segmented watermarking
• CPC Class Codes: H04N 1/32251 in multilevel data, e.g. greyscale or continuous tone data
• CPC Class Codes: H04N 1/32288 Multiple embedding, e.g. cocktail embedding, or redundant embedding, e.g. repeating the additional information at a plurality of locations in the image
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes
• CPC Class Codes: H04N 2201/3281 Encryption; Ciphering
• CPC Class Codes: H04N 2201/3283 Compression

Abstract

A first encoder splits an image into a plurality of blocks, and embeds a first data into the image based on a difference between feature amounts in a combination of the blocks. A second encoder encodes a second data in a form of a combination of image patterns. A disposing unit disposes the combination of image patterns in the image in which the data is embedded by the first encoder.

Claims

1. An encoding apparatus that creates an image in which data is embedded, the encoding apparatus comprising:

a first encoder that splits an image into a plurality of blocks, and embeds a first data into the image based on a difference between feature amounts in a combination of the blocks;

a second encoder that encodes a second data in a form of a combination of image patterns; and

a disposing unit that disposes the combination of image patterns in the image in which the data is embedded by the first encoder.

2. The encoding apparatus according to claim 1, wherein

the first encoder embeds a portion of data into the image, and

the second encoder encodes remaining portion of the data.

3. The encoding apparatus according to claim 1, wherein

the first encoder embeds data for detecting an error in the data encoded by the second encoder into the image.

4. The encoding apparatus according to claim 1, further comprising:

an encrypting unit that encrypts the second data using the first data as an encryption key, wherein

the second encoder encodes the second data that is encrypted by the encrypting unit.

5. The encoding apparatus according to claim 1, wherein

the disposing unit disposes the combination of image patterns in a periphery of the image in which the data is embedded by the first encoder.

6. The encoding apparatus according to claim 1, wherein

the disposing unit selects a portion of the image in which embedding of the first data is difficult based on the difference between feature amounts in a combination of the blocks, and disposes the combination of image patterns that is generated by the second encoder in the portion.

7. A decoding apparatus that extracts data embedded in an image, the decoding apparatus comprising:

a first decoder that splits the image into a plurality of blocks, and extracts a first data that is embedded into the image based on a difference between feature amounts in a combination of the blocks; and

a second decoder that extracts a second data from a combination of image patterns that is disposed in the image.

8. The decoding apparatus according to claim 7, further comprising:

a decoding unit that decodes the second data using the first data as an encryption key.

9. An encoding method of creating an image in which data is embedded, the encoding method comprising:

first encoding including

splitting an image into a plurality of blocks; and

embedding a first data into the image based on a difference between feature amounts in a combination of the blocks;

second encoding including

encoding a second data in a form of a combination of image patterns; and

disposing the combination of image patterns in the image in which the data is embedded at the first encoding.

10. A computer-readable recording medium that stores a computer program for creating an image in which data is embedded, wherein

the computer program causes a computer to execute:

first encoding including

splitting an image into a plurality of blocks; and

embedding a first data into the image based on a difference between feature amounts in a combination of the blocks;

second encoding including

encoding a second data in a form of a combination of image patterns; and

disposing the combination of image patterns in the image in which the data is embedded at the first encoding.

11. A printed material on which an image in which data is embedded is printed, wherein

the image is created by

a first encoder that splits an image into a plurality of blocks, and embeds a first data into the image based on a difference between feature amounts in a combination of the blocks;

a second encoder that encodes a second data in a form of a combination of image patterns; and

a disposing unit that disposes the combination of image patterns in the image in which the data is embedded by the first encoder.