Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Yong-Deok Kim

Yun-Je Oh

Young-hun Joo

Sang-Ho Kim

Chan-yul Kim

Hye-jeong Lee

Kwang-pyo Choi

Min-Woo Lee

Hyun-kyu Yun

Jun-Ho Koh

Han-Sang Kim

Kyung-Ho Chae

Hyun-Hee Park

Jun-ho Koh

Sung-dae Cho

Ho-june Yoo

Kwan-Woong Song

Jae-Hun Cho

Chang-su Kim

Sung-Dae Cho

Han-Lim Lee

Byung-Jik Kim

Do-sung Jung

Sung-Hyun Kim

Kyu-Hyung Cho

Jeong-seok Choi

Chang-Sup Shim

Byuk-sun Kim

Jeong-Seok Choi

Kwan-woong Song

Young-O Park

Chan-Youl Kim

Sung-gook Kim

Bo-eun Kim

Seung-Hoon Baek

Chang-Ick Kim

Won-Jun Kim

Sang-On Choi

Min-Sup Kim

Je-Sun Hwang

Jong-Bo Moon

Min-Jin Kim

Chang-Soo Noh

A method and an apparatus are provided for displaying a portrait on a display by a portable terminal. It is determined whether an image is a character-photographed image. If the image is the character-photographed image, face detection is executed from the image. A character area in the image is set based on a result of the face detection. The character area is enlarged and displayed in a form of a new window.

Method and apparatus of displaying portrait on display

A method of displaying a portrait on a display is provided. The method includes determining whether a photographed image is a character-photographed image according to photographing information of the photographed image; executing face detection from the photographed image if it is determined that the photographed image is a character-photographed image; setting a character area in the photographed image according to a result of the face detection; and magnifying and displaying the character area on the display.

Disclosed is a digital broadcasting transmission apparatus for rapid channel change to an A/V stream of a predetermined channel, the apparatus including a program specific information (PSI) generation unit for generating PSI of the A/V stream, a PSI length detection unit for detecting a length of the PSI generated by the PSI generation unit; a channel information (CI) generation unit for generating CI which includes PSI of all digital broadcasting channels input to the digital broadcasting transmission apparatus, a CI insertion unit for dividing and inserting the CI generated by the CI generation unit into a PSI transmission area generated by the PSI generation unit, according to the length information detected by the PSI length detection unit, and a transport stream (TS) multiplexing unit for multiplexing and outputting the A/V stream and an output of the CI insertion unit.

Digital broadcast transmission/reception apparatus for rapid channel change

Disclosed is a selective frame error concealment method for a moving picture frame, the method including the steps of determining if an erroneous frame corresponds to one among a predetermined number of frames received after an I frame when the erroneous frame is received during reception of moving picture frames, determining if the number of consecutive erroneous frames is greater than a threshold value when the erroneous frame does not correspond to one among the predetermined number of frames received after the I frame, using an error concealment technique when the number of consecutive erroneous frames is equal to or less than the threshold value; and displaying a frame, which has been received without error before the erroneous frame, until receiving a new I frame, either when the erroneous frame corresponds to one among the predetermined number of frames received after the I frame, or when the number of consecutive erroneous frames is greater than the threshold value.

Selective error concealment method and apparatus for moving picture frame

Disclosed is a method for extracting a region-of-interest of a user in a multimedia mobile terminal. The method includes: setting a search region in an input picture input to the multimedia mobile terminal on a screen picture-to-screen picture basis, and extracting a group of boundary of a region-of-interest based on a brightness difference between the set search region and an environment around the set search region; determining boundary coordinates of the region-of-interest through learning during a predetermined frame among the extracted group of boundary coordinate candidates; and enlarging the region-of-interest having the determined boundary coordinates, and displaying the enlarged region-of-interest. As a result, a region the user is most interested in or pays more attention to than other regions on a screen is automatically extracted. Accordingly, it is possible for users to view pictures in such an efficient manner as to provide the users with an even better experience and understanding during viewing.

Extraction method of an interest region for multimedia mobile users

A method and apparatus for error concealment in decoding of a moving picture. The method includes the steps of determining an erroneous macro block in a present frame when the moving picture is decoded, finding a first macro block having a highest similarity to the erroneous macro block and a second macro block having a next highest similarity to the erroneous block in a previous frame by comparing adjacent pixels of respective blocks in the previous frame with adjacent pixels of the erroneous block in the present frame; and replacing the erroneous block by using an average between the found macro blocks having the highest similarity and the second highest similarity to thereby conceal the erroneous macro block. The apparatus includes a parser, an entropy decoder, an inverse quantizer, an inverse converter, and a concealment unit that uses motion compensation from a previous frame to correct a macro block in a current frame.

Method for error concealment in decoding of moving picture and decoding apparatus using the same

A method for transmitting video data to the users via a network in a transcoder of an image processing system including a storage media having a predetermined amount of storage area is disclosed. The method includes the steps of storing in the storage media, the video data provided based on the corresponding services, monitoring a traffic condition of the network to determine if transcoding is necessary; transmitting the stored video data to the corresponding users, respectively, via the network, when the transcoding is not necessary; and transcoding the stored video data to transmit the video data to the corresponding users, respectively, when the transcoding is necessary. The video data provided is based on the corresponding services includes image information having the highest quality of service from a content provider.

Optical network for bi-directional wireless communication

A retransmission apparatus using an IP multicasting method for a DMB service including a plurality (n) of radio frequency (RF) receivers, each for receiving a DMB RF signal of a corresponding channel, a plurality (n) of DMB decoders, each for outputting a transport stream (TS) by decoding the DMB RF signal received from a corresponding RF receiver, a plurality (n) of slicers, each for processing the TS input from a corresponding DMB decoder; a plurality (n) of network interfacers, each for IP packetizing the TS sliced by a corresponding slicer; a network switch for receiving the IP packets from the plurality (n) of network interfacers, transferring the received IP packets to a multicasting processing unit, and receiving multicasting data from the multicasting processing unit, and the multicasting processing unit for receiving the IP packets from the network switch, creating a single piece of multicasting data by assigning multicasting addresses to the received IP packets, and outputting the created multicasting data to the network switch.

Retransmission apparatus using IP multicasting method for DMB service

Disclosed are a system and method for providing digital multimedia broadcasting confinement service. The system includes: a relay center side system, which is adopted to the relay center, according to the relay center side packet identification description (PID) key, for modifying the PID of transport stream and generating the distorted program specific information (PSI); and a terminal side system, which is adopted to the DMB terminal, according to the terminal side PID key, for recovering the distorted PSI of the transport stream received from the relay center and decoding it. The method includes the steps of: identifying whether the actual PID of the TS is consistent when the TS is demultiplexed by audio/video PID acquired through the program map table (PMT) analysis of the TS; generating a preset alarm signal; modifying the PID of the audio/video data in the PMT according to the terminal side PID; and demultiplexing the TS according to the modified PID value.

System and method for digital multimedia broadcasting confinement service

An apparatus for adjusting an output bit rate of a TS packet includes: a TS processing unit for processing the TS packet; an output buffer for buffering and outputting TS packets processed by the TS processing unit; and a bit rate adjustment unit for separating a counting value of packet output time into an integral part and a decimal part by a preset reference cipher according to ticks, generating TS packet output signals for outputting one TS packet stored in the output buffer if a value obtained by performing first counting according to the ticks reaches a value of the integral part, resetting a first count value, and decreasing the first count value by one if a carry occurs in a value obtained by performing second counting for achieving an increment by the value of the stored decimal part whenever the TS packet output signals are generated.

Method and apparatus for adjusting output bit rate of video packet

An asynchronous transport stream receiver of a digital broadcasting receiving system connected to MPEG-2 (Moving Picture Experts Group-2) equipment, such as a VOD (Video On Demand) server is disclosed. The inventive receiver includes an FIFO section for storing MPEG-2 data generated from DVB-ASI (Digital Video Broadcasting Asynchronous Serial Interface) signals, an oscillator for generating clock signals for producing the MPEG-2 data from the DVB-ASI signals, and a read controller for reading and outputting the MPEG-2 data stored at the FIFO section in synchronization with clock signals of the oscillator. Accordingly, the MPEG-2 data can be processed and outputted regardless of the SD or HD leveled compression condition (bit rate) of the MPEG-2 data transmitted according to the DVB-ASI standard.

Asynchronous transport stream receiver of digital broadcasting receiving system employing DVB-ASI mode and method for transmitting asynchronous transport stream thereof

Disclosed is a device for filtering out a null packet in a data stream for example an MPEG-2 TS (Transport Stream) to avoid bandwidth waste when it is transmitted to a backbone network. The device includes a plurality of receiving interfaces, a filter unit, and a controller. The receiving interfaces receive parallel data, such as DVB-ASI (Digital Video Broadcasting-Asynchronous Serial Interface) inputs as channel-by-channel MPEG-2 data. The filter unit counts the respective numbers of data packets and non-data packets of the data input from the receiving interfaces and filters a null packet in the data. A network transmission unit transmits the filtered data to a backbone network. The controller calculates a bit rate based on both of the count numbers received from the filter unit.

Device for filtering out null packet for MPEG-2 transmission

An optical transmission network is disclosed that classifies digital broadcast channel data according to virtual channel connection (VCC) before transmission. In the optical transmission network, an optical signal receiver converts an optical signal from an optical line terminal (OLT) into an ATM cell that is classified according to the VCC. A VCC-based ATM cell classifier detects header information and a payload part from the classified ATM cell of each VCC. PID analyzers receive a payload part of an ATM cell corresponding to one VCC from the VCC-based ATM cell classifier, extract PID of each broadcast channel from digital broadcast channel data included in the payload part, and output specific broadcast channel data in the broadcast channel data included in the payload part. A switch receives broadcast channel data output from the PID analyzers and switches the received broadcast channel data to a broadcast channel desired by each subscriber. The controller updates broadcast channel information by receiving header information of the classified ATM cell of each VCC from the VCC-based ATM cell classifier, receives the broadcast channel desired by the subscriber, and controls the PID analyzers to output the desired broadcast channel according to VCC information with the desired broadcast channel included therein so that the output broadcast channel is matched to the subscriber.

Apparatus and method for switching broadcast channel using VCC information

The provided forward error correction (FEC) apparatus for a transmission system includes a low pass filter (LPF) passing only a low frequency component of an input signal having a predetermined transmission rate; an AC power meter converting an energy value of an signal output from the LPF into a DC voltage value; a logarithm amplifier converting the exponentially varying DC voltage value from the AC power meter into a linear logarithmically varying DC voltage value; a digital signal processor (DSP) determining the transmission rate of the input signal according to a magnitude of the linear DC voltage value and outputting a control signal according to the transmission rate; a clock generator receiving the control signal and generating a clock signal according to the control signal; and a FEC module receiving the clock signal and performing FEC operation on the received signal. A method for FEC is also provided.

Apparatus and method for forward error correction

Growing community of inventors

Seoul, South Korea

Yong-Deok Kim