Patent application number | Description | Published |
20080259834 | CROSS-LAYER OPTIMIZATION METHOD FOR CONTROLLING BIT RATE OF VIDEO CODEC IN TRANSMISSION OF VIDEO DATA IN WIBRO SYSTEM - A cross-layer optimization method for controlling a bit rate of a video coder/decoder (codec) in video data transmission for wireless devices such as a wireless broadband (WiBro) system terminal that adapts to changing transmission/reception characteristics and usage. The method typically includes checking, by a sender, radio channel state information of a sender side and a receiver side; determining, by the sender, a transmission bit rate of a video codec by using the radio channel state information of the sender side; and adjusting, by the sender, the transmission bit rate of the video codec by using the radio channel state information of the receiver side when a communication network used by a receiver typically based on the type of a communication network being used by the sender. | 10-23-2008 |
20080303813 | METHOD FOR RECORDING THREE-DIMENSIONAL VIDEO DATA AND MEDIUM RECORDING THE SAME - Disclosed is a method of storing scene comprising a three-dimensional image, which has been generated by converting an image input an apparatus supporting photographing of the three-dimensional image, into a recording medium. The method includes: loading, in a predetermined file type field, image type information indicating one of a single stereoscopic image and a synthetic image including a monoscopic image and a stereoscopic image; loading, in a configurative information container field, scene descriptor information indicating temporal and spatial relations between a plurality of media objects included in the three-dimensional image, object configurative information indicating object attributes of each media object of said plurality of media objects and a configurative relation between encoded streams of each of the media objects of said plurality, configurative information of the encoded streams, first metadata between the plurality of media objects, and second metadata between each media object of the plurality and the encoded stream thereof, and loading, in a media data container field, a bit stream of each media object included in the three-dimensional image, a bit stream for the first metadata, and a bit stream for the second metadata. | 12-11-2008 |
20090003455 | METHOD AND APPARATUS FOR ILLUMINATION COMPENSATION IN MULTI-VIEW VIDEO CODING - Disclosed is a method and apparatus for illumination compensation in a multi view video coding. The method includes deriving a predicted illumination compensation value of the current block by using information on neighbor blocks of the current block when a current block performing illumination compensation is in a skip mode; setting the current block not to perform the illumination compensation when the derived predicted illumination compensation value is 0 and setting the current block to perform the illumination compensation when the derived predicted illumination compensation value is not 0. | 01-01-2009 |
20090010340 | METHOD AND APPARATUS FOR ILLUMINATION COMPENSATION IN MULTI-VIEW VIDEO CODING - Disclosed is a method of determining illumination compensation in a multi view video coding. The method includes determining when a current block performing illumination compensation is in a B skip mode and deriving a predicted illumination compensation value of the current block by using information regarding neighbor blocks of the current block and when the derived predicted illumination compensation value is not determining, setting the current block not to perform the illumination compensation; and when the derived predicted illumination compensation value is determining, setting the current block to perform the illumination compensation. | 01-08-2009 |
20090022218 | METHOD FOR CONTROLLING MOVING PICTURE ENCODING USING CHANNEL INFORMATION OF WIRELESS NETWORKS - Disclosed is a method for controlling bit rates in consideration of wireless channel environment by an apparatus that transmits and receives moving picture encoding data via a wireless network. The apparatus for transmitting/receiving data through a wireless communication network connected to the apparatus including a channel state analyzing unit for analyzing a wireless channel environment, an encoding controller for generating control information containing information about a quantization parameter, skip or non-skip of frames indication, frame type indication, and use or non-use of an Error Resilient Tool (ERT) indication, in consideration of an analyzation result received from the channel state analyzing unit, a moving picture encoding unit for encoding incoming moving picture data, based on the control information received from the encoding controller; and a data transmitting/receiving unit for transferring the encoded moving picture data through the wireless channel to an exterior. | 01-22-2009 |
20090097405 | METHOD FOR SETTING OUTPUT BIT RATE FOR VIDEO DATA TRANSMISSION IN A WIBRO SYSTEM - A method for setting an output bit rate for video data transmission in a WiBro system in which an uplink state value for a predetermined unit time is calculated to determine an uplink network state of the predetermined unit time. An average of uplink state values for a predetermined number of unit times is calculated, and a video encoding bit rate is increased if the average of the uplink state values is larger than a predetermined first threshold. However, the video encoding bit rate is decreased if the average of the uplink state values is less than a predetermined second threshold. | 04-16-2009 |
20090097546 | SYSTEM AND METHOD FOR ENHANCED VIDEO COMMUNICATION USING REAL-TIME SCENE-CHANGE DETECTION FOR CONTROL OF MOVING-PICTURE ENCODING DATA RATE - Disclosed is a method for detecting a scene change in real time in order to control a moving-picture encoding data rate, the method including: dividing a current frame into a plurality of regions, and calculating a dissimilarity metric (DM) of each divided region; determining if the dissimilarity metric of each divided region is beyond a preset reference value; calculating the number of regions, the dissimilarity metric of which is beyond the preset value, in the current frame; and determining that a scene change occurs in the current frame, when the number of regions, the dissimilarity metric of which is beyond the reference preset value, is equal to or greater than a preset threshold value. | 04-16-2009 |
20090122134 | METHOD OF RECORDING THREE-DIMENSIONAL IMAGE DATA - A method of storing 3D image data in a recording medium includes: loading, in a predetermined file type field, image type information indicating either one of a single stereoscopic image or a compound image including a monoscopic image and a stereoscopic image; loading, in a predetermined image configuration information container field, scene descriptor information indicating temporal and spatial relations between a plurality of media objects included in the three-dimensional image, object configuration information indicating attributes of each media object of said plurality of media objects and a configuration relation between encoded streams of the plurality of media objects, configuration information of the encoded streams; loading in an image data container field media data of an image to be stored; and loading, in a meta container field, metadata including information for playing the 3D image data. | 05-14-2009 |
20090153668 | SYSTEM AND METHOD FOR REAL-TIME VIDEO QUALITY ASSESSMENT BASED ON TRANSMISSION PROPERTIES - A system and method for video quality assessment includes utilizing codec auxiliary information related to the encoding and decoding process to enhance performance of picture quality assessment. In a video transmission system, video quality assessment can be accurately performed in real time with reduced computational load upon the client. In particular, the server performs first picture quality assessment and sends the assessment result to the client, and the client performs second picture quality assessment only when a transmission error occurs to reduce the computational load on the client. | 06-18-2009 |
20100008506 | METHOD AND APPARATUS FOR PERFORMING VOIP-BASED COMMUNICATION USING BIO KEYS - A method for performing an encrypted voice call between a first terminal and a second terminal supporting a Voice over Internet Protocol (VoIP)-based voice call. In the method, the first and second terminals generate and store a bio key using biographical (bio) information of a user in advance before performing a voice call, the first terminal sends a request for a voice call to the second terminal and establishing a session, the first and second terminals exchange and store a bio key stored in each terminal, and the first and second terminals generate a session shared key using the exchanged bio key and starting a Secure Real-time Transport Protocol (SRTP) session, and a restored bio key by acquiring bio information from received data. User authentication is then performed by comparing the bio key with the restored bio key. | 01-14-2010 |
20100027566 | METHOD FOR COMPRESSING A REAL-TIME TRANSPORT PROTOCOL HEADER EXTENSION FIELD - A method for compressing an extension field to be selectively included in a Real-time Transport Protocol (RTP) header is provided. It is determined whether an RTP header extension field is included in the RTP header. Information indicating a determination result is recorded. Profile information of the RTP header extension field is recorded. Total length information of the RTP header extension field is recorded. Information indicating whether changed data exists is recorded using a header extension information map. | 02-04-2010 |
20100036965 | METHOD OF TRANSMITTING/RECEIVING STREAMING DATA IN COMMUNICATION SYSTEM INCLUDING SERVER AND MOBILE COMMUNICATION TERMINAL, AND COMMUNICATION SYSTEM THEREFOR - Disclosed are a method of transmitting/receiving streaming data, to which a bit rate suitable for a mobile communication terminal is applied, in a communication system including a server and the mobile communication terminal, and a communication system therefor. The communication system include the server for converting multimedia data into the streaming data, and transmitting the streaming data to the mobile communication terminal; and the mobile communication terminal for, on receiving the streaming data from the server, collecting streaming parameters for use to determine the bit rate, and newly determining the bit rate. | 02-11-2010 |
20100082834 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN A WIRELESS COMMUNICATION NETWORK - An apparatus and method for transmitting and receiving data in a wireless communication network are provided, in which a terminal includes a transmitter for determining a video rate using at least one of collected radio channel information and a streaming parameter received from a corresponding terminal, converting video data included in multimedia data to video streaming data using the determined video rate, and transmitting streaming data including the video streaming data, and a receiver for receiving a streaming parameter as a feedback for the transmitted streaming data from the corresponding terminal. | 04-01-2010 |
20100135490 | METHOD AND APPARATUS FOR PERFORMING VIDEO COMMUNICATION - A method for performing video communication is provided. The method includes: creating and saving a bio key using a user's biological information before first and second terminals perform the video communication; establishing a session, wherein the first terminal requests voice communication with the second terminal; exchanging bio keys saved in the respective terminals and saving the same; starting a Secure Real-Time Transport Protocol (SRTP) session, wherein the first and second terminals create a session sharing key using the exchanged bio keys; creating a restored bio key by obtaining the biological information from data received by first and second terminals and performing a user certification by comparing the bio key with the restored bio key. | 06-03-2010 |
20100232292 | METHOD FOR VARIABLY CONTROLLING BIT RATE OF VIDEO DATA THROUGH END-TO-END CHANNEL STATUS SENSING IN A WIBRO NETWORK - A method for variably controlling a bit rate of video data through end-to-end channel status sensing in a Wireless Broadband (WiBro) network is provided. The method includes classifying wireless channel statuses of a transmission side and a reception side into normal and abnormal statuses during video data transmission; variably controlling and determining an encoding bit rate of a transmission side's encoder according to the classification result; and comparing the determined encoding bit rate with a Down Link Modulation & Coding Selection Level (DL MCS Level) which is a parameter of the reception side, so as to vary a final encoding bit rate of the transmission side. | 09-16-2010 |
20110187926 | APPARATUS AND METHOD FOR CORRECTING JITTER - A jitter correction method of a transmitting device, a jitter correction method of a receiving device, a transmitting device, and a receiving device are provided. The jitter correction method of the transmitting device includes: determining a time stamp of a video frame; determining a transfer time of an real-time transport protocol (RTP) packet that includes at least a part of the video frame as a payload; generating the RTP packet including the time stamp and the transfer time; and transmitting the RTP packet to a receiving device. | 08-04-2011 |
20110314174 | STORAGE FILE FORMAT FOR MULTIMEDIA STREAMING FILE, AND STORAGE METHOD AND CLIENT APPARATUS USING THE SAME - A storage file format for replaying an adaptively streamed multimedia stream, a client apparatus using the storage file format, and a method of storing a multimedia stream in the client apparatus are provided. According to the storage file format, meta-information for playing fragments and fragment access meta-information for replaying fragments are added to fragments. | 12-22-2011 |
20130147914 | METHOD FOR PROVIDING FRAGMENT-BASED MULTIMEDIA STREAMING SERVICE AND DEVICE FOR SAME, AND METHOD FOR RECEIVING FRAGMENT-BASED MULTIMEDIA STREAMING SERVICE AND DEVICE FOR SAME - Provided are method and apparatus for transmitting and receiving a multimedia streaming service via a network. The method of providing a multimedia streaming service includes: dividing encoded data of a video including at least one of a two-dimensional (2D) video and a three-dimensional (3D) video into fragments; determining at least one of 3D signaling information for each fragment and relationship information to be used when the video refers to other videos; and continuously transmitting the fragments including the property information regarding the fragments and encoded video data. | 06-13-2013 |
20130239010 | CLIENT APPARATUS, CLIENT CONTROL METHOD, SERVER AND IMAGE PROVIDING METHOD USING THE SERVER - A client apparatus which performs communication with a server is provided. The client apparatus includes a display unit which receives a user's touch manipulation through a touch sensor; a communication interface unit which transmits information corresponding to the user's touch manipulation to the server; and a control unit which, when an image corresponding to the user's touch manipulation is received from the server through the communication interface unit, controls the display unit to display the received image. | 09-12-2013 |
20140089391 | CLIENT APPARATUS AND SERVER AND CONTROL METHOD THEREOF - A client apparatus, a server, and a control method thereof are provided. The client apparatus includes a display, a user interface which receives a text input, a communication interface which transmits to the server information related to input text, a storage which receives a result of analysis of the information transmitted from the server and stores the same, and a controller which performs control operations so that, in response to the text input being received via the user interface after the result of the analysis received, the received text is converted based on a stored result of the analysis, before being displayed. | 03-27-2014 |
20140112120 | SERVER, CLIENT DEVICE, AND CONTROL METHODS THEREOF - A server, a client device, and control methods thereof are provided. The server includes: a communicator which communicates with the client device; and a controller which, if a retransmission request for a previously transmitted real-time data packet is received from the client device, repeatedly retransmits the previously transmitted real-time data packet. | 04-24-2014 |
20150019716 | METHODS AND APPARATUSES FOR TRANSMITTING AND RECEIVING DATA AND RECORDING MEDIUM FOR EXECUTING THE METHODS - A method of transmitting data, the method includes transmitting a frame containing at least one data packet; generating at least one detection packet for detecting a loss of a last data packet among the at least one data packet; and in response to the last data packet of the frame being transmitted, transmitting the at least one detection packet so that the detection packet is transmitted subsequent to the data packet. Whether or not the last data packet is lost is determined by using the detection packet. | 01-15-2015 |