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EP0977434A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

System for changing attribute of image by electronic watermark

Assignee: NEC Corp
•
Filing: 1999-07-28
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Granted: —
•
Expires: 2019-07-28
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Abstract

Abstract In the attribute detection apparatus in the system of the present invention, an inputted image is transformed by DCT means to extract an estimation value of the embedded electronic watermark data in frequency space. Then, the statistical similarity between known electronic watermarks and the extracted electronic watermark data are calculated. The attribute change apparatus in a system of the present invention comprises a selector, an insert data register for storing the output of the selector, a brightness register for storing the brightness signal of the inputted image, a color difference register for storing the color difference signal of the inputted image, and an adder for adding the output of the color difference register and the output of the insert data register. Here, the selector selects one of the insert data stored in a plurality of memory areas on the basis of the attribute inputted from attribute detection apparatus.

Inventors

  • 👤 Masahiro c/o NEC Corporation Hashimoto

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 12:38
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G06T2201/00; G06T2201/005; G06T2201/0052; H04N2005/91307; H04N2005/91328; H04N2005/91335

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 161 words
A system for changing attribute of image by electronic watermark, wherein a prescribed insert data is added to an electronic watermark embedded in an image, which comprises: an image input means for inputting said image in which said electronic watermark is imbedded; a discrete cosine transformation means for transforming said image; a determination means for calculating a statistical similarity between said electronic watermark and a prescribed electronic watermark; an attribute detection means for outputting an attribute of said image on the basis of an output from said determination means; a plurality of memories for storing said insert data; a selector for selecting one of said insert data; an insert data register for storing an output from said selector; a brightness register for storing a brightness signal of said image; a color difference register for storing a color difference signal of said image; and an adder for adding the output of said brightness register and the output of said color difference register.
Claim 2
Dependent Claim 46 words
The system for changing attribute of image by electronic watermark according to Claim 1, which further comprises an image output means for outputting said image superimposed by one of said insert data by inputting an output from said brightness register and an output from said adder.
Claim 3
Dependent Claim 76 words
The system for changing attribute of image by electronic watermark according to Claim 1, which further comprises; a brightness output register for inputting an output of said adder; a color difference output register for inputting an output of said color difference register; and an image output means for outputting said image superimposed by one of said insert data by inputting an output from said brightness output register and an output from said color difference output register.
Claim 4
Dependent Claim 55 words
The system for changing attribute of image by electronic watermark according to Claim 1, which further comprises an analog to digital converter which inputs said image from said image input means, outputs a brightness signal of said image to said brightness register, and outputs color difference signal of said image to said color difference register.
Claim 5
Dependent Claim 66 words
The system for changing attribute of image by electronic watermark according to Claim 4, which further comprises: a digital to analog converter which converts an output from said brightness output register and an output from said color difference output register; and an image output means for outputting said image superimposed by one of said insert data by inputting an output from said digital to analog converter.
Claim 6
Dependent Claim 33 words
The system for changing attribute of image by electronic watermark according to Claim 1, wherein the number of bits of said insert data and the bit width thereof are equal to each other.
Claim 7
Dependent Claim 30 words
The system for changing attribute of image by electronic watermark according to Claim 6, wherein one of said insert data is a datum such that all the bits are zero.

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