Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Sumitomo Electric Industries, Limited

Renesas Technology Corp.

Nippon Hoso' Kyokai

Koken Company, Limited

Mitsuyoshi Suzuki

Hiroshi Ito

Koichi Magai

Ryousuke Fujii

Tokumichi Murakami

Minoru Wada

Kohtaro Asai

Tomohiro Kimura

Kenichi Asano

Tsutomu Kubo

Kazuo Sugimoto

Hiroyuki Kurokawa

Shinichi Uramoto

Takehiko Hanada

Akihiko Takabatake

Hideya Konda

Kazuki Sogabe

Hiroshi Itou

Toshihiro Nakae

Masayuki Baba

Koutarou Asai

Go Ohtake

Seiichi Goshi

Kouichi Magai

Shigenori Takai

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 control unit () is provided for storing time information of data which are received for the first time by a receiving unit () in a memory (), and for, every time when the receiving unit () detects time information, acquiring the time information from the receiving unit (), calculating the difference between the acquired time information and the time information of the first received data stored in the memory (), and, when the difference reaches a predetermined amount, outputting a command for starting a playback of data to a playback unit (). The playback unit () starts a playback of the data stored in the storage unit () when the command for starting a playback of data is outputted from the control unit ().

Data playback apparatus and data playback method

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 encoded data modification device and the like are obtained which are capable of modifying a signal with a small delay. There is provided the encoded data modification device, including: an operational buffer that stores inputted encoded data formed of a plurality of encoded units; a decoder circuit that decodes the encoded data stored in the operational buffer; a modification circuit that modifies a first encoded unit of the decoded data and modifies following decoded encoded units according to the modification; an encoder circuit that re-encodes the modified data; an operational circuit that judges whether the modification is contained in the data in the buffer; and a write control circuit that rewrites the encoded data stored in the operational buffer to the data modified by the modification circuit and re-encoded by the encoder circuit when the operational circuit judges that the modification is contained in the data in the buffer.

Encoded data modification device, modification method, and modification program

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.

Electronic watermark embedding method, electronic watermark detecting method, electronic watermark detecting apparatus and program

To obtain a noise eliminating device which is capable of efficiently separating a noise component from an image component to attenuate only the noise component. A noise eliminating device includes: a first input reading unit () for reading out input image block data of a predetermined block; a second input reading unit () for reading out reference data containing data in the vicinities of the predetermined block; an output reading unit () for reading out output image block data of the predetermined block; a comparing unit () for comparing a level of a difference signal representing a difference between the input image block data and the output image block data with a predetermined value; a retrieving unit () for retrieving retrieval block data correlating with the input image block data; a switching unit () for outputting output image block update data based on comparison results; an output writing unit () for writing the scaled output image block update data to an output image buffer (); and a control unit () for successively carrying out setting of a plurality of predetermined blocks.

Noise eliminating device and method therefor

When real-time recording a dynamic image in a storage medium of a fixed recording capacity at a variable bit rate, an encoding generated information quantity controller obtains a recording capacity and a recording time of information to be sequentially recorded in the storage medium, obtains a remaining recording capacity and a remaining recording time of the storage medium from the obtained recording capacity and recording time, calculates a target bit rate at and after the current time from the remaining recording capacity and the remaining recording time, and controls the variable bit rate to sequentially change its quantization step size to a quantization step size for maintaining a bit rate not larger than the target bit rate. Therefore, a dynamic image data with a proper picture quality can be stored within a prescribed time and prescribed capacity of the storage medium.

Dynamic image encoding apparatus

An image display apparatus decodes and reproduces digital data representing frames of pictures. Each frame includes at least two fields. The apparatus includes a memory having banks, each bank storing one field of a multi-field picture. The banks of the memory from which picture data is to be read when pictures are reproduced in a reverse reproduction mode are specified so that the fields are read in a reverse order from the order in which the fields are read when pictures are reproduced in a forward reproduction mode.

Image display apparatus and special picture reproduction controller

In a motion vector detecting apparatus, pixel data in a search block located away from the position of a reference block by a search vector is selected from pixel data in a coded frame as pixel data to be compared with pixel data in the reference block. Further, the search block is moved in horizontal and vertical directions.

Motion vector detecting apparatus

The video and audio synchronization controller sets a system clock reference (SCR) included in the frame header portion of the coded video and audio data into a system time counter to set a timing of a system time clock (STC), immediately after a video and audio reproducing device has been powered on. The video and audio reproducing device decodes and displays a first arriving video data synchronous with a display system frame pulse, which is the closest to the value of a video time stamp included in a frame header of the first video frame on the time axis of the set STC. The video and audio synchronization controller sets again the value of the time stamp included in the first video frame to the system time counter to update the STC. The video and audio reproducing device outputs the video data for the second and subsequent video frames and all the audio data synchronous with the updated STC by outputting the video and audio data when the time indicated by the video and audio time stamps arrives on the time axis of the updated STC.

Video and audio reproducing device and video decoding device

A fiber fixing device for a linear lightguide comprises a tubular chuck and an elastic tubular body. The chuck includes a hollow part along its axis for receiving an optical fiber, a grasp part for grasping the received optical fiber, and a coupling part supporting the grasp part. The elastic tubular body is elastically expanded outwardly in the radial direction and in this state is fitted onto the grasp part of the chuck. Thus, the elastic tubular body exerts an elastic restoring force to radially inwardly press the grasp part which thereby grasps the optical fiber.

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Tokyo, Japan

Mitsuyoshi Suzuki