Electronics and Telecommunications Research Institute

Sanghyun Joo

Yong-Seok Seo

Weon Geun Oh

Young Ho Suh

Kwang-Roh Park

Bum-Suk Choi

Hae-Ryong Lee

Seon Hwa Lee

Il Kwon Jeong

Jaehwan Kim

Yong Seok Seo

Sang Won Ghyme

Chang Soon Park

Munchurl Kim

Hyo Taeg Jung

Chae-Kyu Kim

Won Gyum Kim

Seungsoon Park

Shinjee Pyo

Muhammad Syah Houari

An apparatus for tutoring in a convergence space of real and virtual environment, includes a character data processing unit for generating character shape and operation data of a participant or performing rendering on the character shape and operation data; a desk data processing unit for generating desk shape data or perform the rendering on the desk shape data; a voice and sound data processing unit for generating voice or sound data or outputs the voice or sound data; and a virtual space processing unit for generating real space data and providing the generated data to another participant, generating the convergence space data, or generating the character shape data, the operation data, the desk shape data, and the voice or sound data, then providing the generated data to the character data processing unit, the desk data processing unit, and the voice and sound data processing unit.

Apparatus and method for tutoring in convergence space of real and virtual environment

Provided are method and apparatus for representing sensory effects, and a computer readable recording medium storing user sensory preference metadata. A method for providing user preference information includes: receiving preference information for predetermined sensory effects from a user; and generating user sensory preference metadata including the received preference information, wherein the user sensory preference metadata includes personal preference information that describes the preference information.

Method and apparatus for representing sensory effects and computer readable recording medium storing user sensory preference metadata

Provided is a method and apparatus for generating and consuming sensory effect media. The method for generating sensory effect media includes receiving sensory effect information about sensory effects that are applied to media, and generating sensory effect metadata including the received sensory effect information. The sensory effect metadata includes effect description information for describing the sensory effects and device control description information for controlling devices that perform the sensory effects.

Sensory effect media generating and consuming method and apparatus thereof

A for embedding a digital watermark on a wavelet lowest subband includes: setting a DC component region of a multi-stage wavelet-transformed original copy image to a watermark embedment region, and high-frequency filtering an original picture LLof the embedment region; generating index information for designating a pixel position, and a watermark sequence to be embedded; calculating an embedment strength &#x3bb; for each position of the watermark embedment region; in case the watermark sequence is sequentially embedded on an embedded position designated by the index information, mutually comparing the original picture LLcoefficient value for each embedded position with a mirror picture LL' coefficient value, and then altering the original picture LLcoefficient value; and in case the original picture LLcoefficient value is differentiated above a predetermined value with reference to the coffesponding embedment strength &#x3bb;, skipping the watermark embedment for the position.

Method for embedding and extracting digital watermark on lowest wavelet subband

An apparatus and method for preventing illegitimate distribution of digital contents on Internet obtains a first wavelet image having a user information-embedding region by performing a wavelet transformation (WT). The user information embedding region of the first wavelet image is wavelet-transformed to obtain a second wavelet image composed of a discrete cosine (DC) region and high-frequency regions second wavelet image. A high-frequency components removed image is obtained by removing high-frequency components in the high-frequency regions of the second wavelet image, and subjected to an inverse WT (IWT) to be outputted as an IWT image. A user information embedding unit embeds user information to the IWT image, wherein data of the user information are sequentially embedded to positions where a difference value between the user information embedding region and the new user information embedding region is small, to thereby reset the user information embedding region as the user information.

Apparatus and method for preventing illegal distribution of digital contents by using a fingerprinting technique

The present invention relates to a method for blindly embedding and extracting a watermark by using wavelet transform and a human visual system (HVS) model, which obtains both robustness and invisibility by applying the HVS model of NVF or JND imitating a human visual system to a middle frequency band for wavelet transformation and using a quantization step determined adaptively according to the importance of wavelet coefficient. A method according to the present invention includes the steps of: decomposing an original image by a wavelet and selecting a middle frequency band as a watermark embedment area; obtaining an HVS model having a human visual recognition information at each embedding position; determining the importance of the coefficient for each embedding position, and adaptively determining a quantization step for each embedment location by using the importance and the HVS model; quantizing each pair of embedment area by the quantization step and variably embedding a watermark sequence into a middle frequency band according to a value of the watermark; and performing inverse wavelet transform on an overall area into which the watermark sequence is embedded, and generating a watermarked image.

Method for blindly embedding and extracting a watermark by using wavelet transform and an HVS model

In an apparatus for embedding digital watermarks into an image, a watermark embedding region extraction unit extracts an image region to contain watermarks from a wavelet transformed entire image. A watermark generation unit generates a watermark data row to be embedded according to a user's private key. A normalization operation unit normalizes the quantized data value by using a quantization unit into a normalized data value. An inverse quantization inversely quantizes and outputs the normalized data value. A watermark embedment unit embeds a watermark-embedded data value as a corresponding pixel data value into the watermark embedding region, wherein the watermark-embedded data value is obtained by subtracting, from the inversely quantized data value, the watermark data value added prior to the quantization.

Apparatus and method for embedding and extracting a digital watermark based on a wavelet

An apparatus and method for embedding and extracting digital watermarks using a blind mode based on wavelet transform which is robust to external attacks while being capable of minimizing a degradation in picture quality caused by embedding of the watermarks. In accordance with the invention, watermarks protection of the copyright for desired data are embedded in DC component domains of wavelet-transformed domains. In accordance with the invention, embedding of watermarks in a target image corresponding to a target domain in which the watermarks are to be embedded, is achieved by generating a data stream of the watermarks in accordance with a key value selected by the user, generating index information representing positions where the watermarks are to be embedded, in accordance with a key value selected by the ser, and reflecting the watermark data stream on data values of pixels in the target image at the positions based on the index information.

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Daejeon, South Korea

Sanghyun Joo