Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Nippon Hoso' Kyokai

Ryousuke Fujii

Mitsuyoshi Suzuki

Hiroshi Ito

Koichi Magai

Tokumichi Murakami

Minoru Wada

Kohtaro Asai

Tomohiro Kimura

Kazuo Sugimoto

Hiroshi Itou

Koutarou Asai

Go Ohtake

Kouichi Magai

Seiichi Goshi

A digital watermark embedding device and a digital watermark detecting device are obtained, which can realize stable digital watermark detection using fewer, and embed and detect a larger amount of digital watermark information with an identical number of pixels used for digital watermark embedding in a conventional technology. The digital watermark embedding device includes: an embedding-information converting unit () for converting inputted information to be embedded into a bit string formed of '0's' and '1's' and embedding respective bits of the converted bit string multiple times to output a digital watermark pattern having N &#x2212;1's or N+1's as elements; an orthogonal-pattern generating unit () for generating orthogonal patterns each formed of a combination of elements of &#x2212;1's and +1's and orthogonal to one another; an integrating unit () for integrating each of the orthogonal patterns from the orthogonal-pattern generating unit with each of the elements of the digital watermark pattern from the embedding-information converting unit to generate an embedding pattern; and a digital-watermark embedding unit () for embedding embedding pattern from the integrating unit in an input image and outputting an image after embedding information.

Digital watermark embedding device and digital watermark detecting device

A digital watermark embedding device according to the present invention includes: a watermark pattern generation part () which generates a watermark pattern varying in a time direction based on embedding information to be embedded in an input image to be processed; a synchronization pattern generation part () which outputs a fixed pattern for detecting synchronization as a watermark pattern; a pattern switching part () which selects between the watermark pattern output by the synchronization pattern generation part () and the watermark pattern output by the watermark pattern generation part () based on the input image (); and an embedding processing part () which adds the selected watermark pattern to each pixel value of the input image () to generate an embedded image () having a digital watermark embedded therein. Consequently, phase shifting may be detected based on the fixed pattern for detecting synchronization, there by being capable of precisely detecting the digital watermark out of a recaptured image as well.

Digital watermark embedding device and method, and digital watermark detection device and method

The digital watermark embedding apparatus includes: a storing unit () for storing in advance at least one embedding function, at least one image converting program, and at least one image processing program that are required for a digital watermark embedding process, and storing in advance combination process information in which a process ID is assigned to each combination of those processing functions; an embedding process selecting unit () for selecting, as particular combination process information, one of a plurality of pieces of the combination process information; and an embedding unit () for obtaining from the storing unit () the embedding function, the image converting program, and the image processing program which are included in the selected particular combination process information, embedding particular embedding information into multimedia data, and generating determination information including the process ID corresponding to the particular combination process information.

Digital watermark embedding apparatus, digital watermark detecting apparatus, and digital watermark system

A digital watermark detecting device includes an extracting unit to extract pixels embedded as a digital watermark from an input image and to output an extracted pixel value row, a generating unit to generate a set of orthogonal patterns, a detecting unit to calculate a correlation using an integration result of the orthogonal patterns and the extracted pixel value row, to determine detected values corresponding to the orthogonal patterns and a standard deviation for detected values excluding a maximum detected value with a maximum absolute value from the calculated detected values, to calculate a quotient by dividing the maximum detected value by the standard deviation, a discriminating unit to output information corresponding to the result of comparison between a threshold parameter and the quotient, and a unit to convert the detected value inputted from the detecting unit into predetermined information, when the reliability of the detected values satisfies a standard.

Digital watermark detecting device

Provided are a program, a method, and an apparatus for decoding coded data, capable of completely restoring an original stream when decoded data is coded again by causing a computer to function as: means for receiving an input of a signal coded by lossy compression and orthogonally projecting an optional real number vector on one convex aggregate X in a first vector space in which the decoded signal is present; means for judging convergence of convex projection and obtaining a real number vector x belonging to the aggregate X to output the same as a decoded signal when the convergence of the convex projection is judged; and means for orthogonally projecting an optional vector of the first vector space on one convex aggregate Y in a second vector space different from the first vector space when the convergence of the convex projection is not judged, and then repeating orthogonal projection on the aggregate X and the aggregate Y with the coded signal set as an initial value.

Program, method, and apparatus for decoding coded data

An information processing apparatus includes an additional information conversion means for converting a text of related information into additional information and outputting this additional information, and for outputting an amount of additional information for each point of interest, an embedding region allocating means for outputting region management information including the amount of additional information, for allocating an embedding region for the additional information in an original digital input image on the basis of image size information and the amount of additional information, and for outputting information on the embedding region as region information, and an information embedding means for embedding the region management information in a predetermined region in the original digital input image, and also embedding the additional information in the original digital input image on the basis of the region information to generate and output a watermarked image.

Information processing apparatus and information processing method

An electronic image into which an electronic watermark is to be embedded is divided into a plurality of image regions spatially, and pixels each having a property of being difficult to visually recognize a variation in a pixel value are extracted as adaptive pixels from each of the plurality of image regions. A variation between the pixel values of the adaptive pixels in one of the plurality of image regions and those of the adaptive pixels in an adjacent one of the plurality of image regions is produced, and the pixel values of the adaptive pixels of the plurality of image regions are varied in a time direction according to the value of an embedded bit set of the electronic watermark. An electronic-watermark-embedded image is then generated by making the variation in the pixel values of the adaptive pixels vary step by step at a boundary between the two of the plurality of image regions and/or in the time direction so that the variation makes a slow transition.

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Tokyo, Japan

Ryousuke Fujii