Information detecting device, information detecting system, and information detecting method

• US 9,865,028 B2
• Filed: 03/16/2016
• Issued: 01/09/2018
• Est. Priority Date: 05/28/2015
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kato, Keizo, Kuraki, Kensuke, Tanaka, Ryuta
• Primary Examiner(s): Baker, Charlotte M
• Application Number:
  US15/072,003
• Publication Number:
  US 20160350890A1
• Time in Patent Office: 664 Days
• Field of Search: 382100, 283 72, 283 85, 340 586, 356 71, 348 89, 235494, 235487
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 1/0028 Adaptive watermarking, e.g. Human Visual System [HVS]-based watermarking
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 2201/0061 Embedding of the watermark in each block of the image, e.g. segmented watermarking
• CPC Class Codes: G06T 2201/0065 Extraction of an embedded watermark; Reliable detection
• CPC Class Codes: H04N 1/32203 Spatial or amplitude domain methods H04N1/32309 takes precedence
• CPC Class Codes: H04N 1/32208 involving changing the magnitude of selected pixels, e.g. overlay of information or super-imposition H04N1/32219, H04N1/32224 take precedence
• CPC Class Codes: H04N 1/32229 with selective or adaptive application of the additional information, e.g. in selected regions of the image H04N1/32213 takes precedence
• 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 1/32293 Repeating the additional information in a regular pattern
• CPC Class Codes: H04N 1/32304 Embedding different sets of additional information
• CPC Class Codes: H04N 1/32309 in colour image data

Abstract

A memory stores video information obtained by photographing an object that reflects light in which embedded information is superimposed onto a plurality of components in a color space. A processor emphasizes a signal obtained from an image included in the video information on the basis of a result of emphasizing a first color component more than a second color component according to a spectral reflection characteristic in a range including the object, and detects the embedded information from the emphasized signal, the first color component and the second color component being from among a plurality of color components that correspond to a plurality of wavelengths, the first color component having a reflectance higher than a reflectance of the second color component. A display device outputs information on the basis of the embedded information detected by the processor.

Claims

1. An information detecting device comprising:

a memory that stores video information obtained by photographing an object that reflects light in which embedded information is superimposed onto a plurality of components in a color space;

a processor that detects the embedded information from an emphasized signal obtained from an image included in the video information by emphasizing a first color component more than a second color component according to a spectral reflection characteristic of a surface of the object, the first color component and the second color component being from among a plurality of color components that correspond to a plurality of wavelengths, the first color component having a reflectance higher than a reflectance of the second color component in the spectral reflection characteristic; and

a display device that outputs information on the basis of the embedded information detected by the processor.

2. The information detecting device according to claim 1, wherein

the processor selects a signal of a specific component according to the spectral reflection characteristic of the surface of the object, and detects the embedded information from the selected signal.

3. The information detecting device according to claim 1, wherein

the processor estimates the spectral reflection characteristic on the basis of a feature amount of the image.

4. The information detecting device according to claim 3, wherein

the processor obtains a reflectance that corresponds to each of the plurality of color components on the basis of a plurality of feature amounts of the plurality of color components in the image, and uses a plurality of reflectances that respectively correspond to the plurality of color components as the spectral reflection characteristic.

5. The information detecting device according to claim 3, wherein

the processor divides the image into a plurality of regions, estimates the spectral reflection characteristic that corresponds to each of the plurality of regions on the basis of a feature amount of each of the plurality of regions, and emphasizes the first color component on the basis of the spectral reflection characteristic that corresponds to each of the plurality of regions.

6. The information detecting device according to claim 5, wherein

the processor selects a signal of a specific component from among a plurality of signals of a plurality of components obtained in each of the plurality of regions according to the spectral reflection characteristic that corresponds to each of the plurality of regions, and detects the embedded information by using a plurality of signals selected in the plurality of regions.

7. The information detecting device according to claim 6, wherein

the color space is defined by the plurality of color components, and the plurality of signals of the plurality of components obtained in each of the plurality of regions are a plurality of signals of the plurality of color components.

8. The information detecting device according to claim 6, wherein

the color space is defined by a plurality of color difference components, and the plurality of signals of the plurality of components obtained in each of the regions are a plurality of signals of the plurality of color difference components.

9. The information detecting device according to claim 5, wherein

the processor weights the plurality of signals of the plurality of components obtained in each of the plurality of regions according to the spectral reflection characteristic that corresponds to each of the plurality of regions, and detects the embedded information by using a plurality of signals weighted in the plurality of regions.

16. The information detecting method according to claim 1, wherein

the video information is obtained by a camera that photographs the object.

17. The information detecting method according to claim 1, wherein

the display device displays a text, an illustration or an image on a screen on the basis of the embedded information.

18. The information detecting method according to claim 1, wherein

the embedded information is superimposed onto the light by an illuminating device that changes a plurality of color components of the light in time series by controlling an emitted light amount or a phase of a light emitter and that irradiates the object with the light.

10. An information detecting system comprising a terminal device and an information processing device, wherein

the terminal device includes:

a memory that stores video information obtained by photographing an object that reflects light in which embedded information is superimposed onto a plurality of components in a color space;

a first communication device that transmits the video information to the information processing device; and

a display device that outputs information on the basis of the embedded information received from the information processing device, and

the information processing device includes;

a processor that detects the embedded information from an emphasized signal obtained from an image included in the video information by emphasizing a first color component more than a second color component according to a spectral reflection characteristic of a surface of the object, the first color component and the second color component being from among a plurality of color components that correspond to a plurality of wavelengths, the first color component having a reflectance higher than a reflectance of the second color component in the spectral reflection characteristic; and

a second communication device that transmits the embedded information detected by the processor to the terminal device.

11. The information detecting system according to claim 10, wherein

the processor estimates the spectral reflection characteristic on the basis of a feature amount of the image.

12. A non-transitory computer-readable recording medium having stored therein an information detecting program for causing a computer to execute a process comprising:

referring to a memory that stores video information obtained by photographing an object that reflects light in which embedded information is superimposed onto a plurality of components in a color space;

detecting the embedded information from an emphasized signal obtained from an image included in the video information by emphasizing a first color component more than a second color component according to a spectral reflection characteristic of a surface of the object, the first color component and the second color component being from among a plurality of color components that correspond to a plurality of wavelengths, the first color component having a reflectance higher than a reflectance of the second color component in the spectral reflection characteristic; and

outputting information on the basis of the detected embedded information.

13. The non-transitory computer-readable recording medium according to claim 12, wherein

the process further comprises estimating the spectral reflection characteristic on the basis of a feature amount of the image.

14. An information detecting method comprising:

referring to, by a processor, a memory that stores video information obtained by photographing an object that reflects light in which embedded information is superimposed onto a plurality of components in a color space;

detecting, by the processor, the embedded information from an emphasized signal obtained from an image included in the video information by emphasizing a first color component more than a second color component according to a spectral reflection characteristic of a surface of the object, the first color component and the second color component being from among a plurality of color components that correspond to a plurality of wavelengths, the first color component having a reflectance higher than a reflectance of the second color component in the spectral reflection characteristic; and

outputting information on the basis of the detected embedded information.

15. The information detecting method according to claim 14, further comprising:

estimating the spectral reflection characteristic on the basis of a feature amount of the image.