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 |
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 |
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 |
20100142927 | AUDIO AND VIDEO SYNCHRONIZATION APPARATUS AND METHOD IN WIRELESS COMMUNICATION NETWORK - An audio and video synchronization apparatus and method in a wireless communication network are provided. The audio and video synchronization apparatus includes a receiver that receives audio frames and video frames, a playback buffer that sequentially buffers the audio frames, a detector that determines whether the audio frames are synchronized with the video frames and adjusts a playback time of the video frames based on a playback time of the audio frames if it is determined the audio frames are not synchronized with the video frames. | 06-10-2010 |
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 |
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 |
20140372100 | TRANSLATION SYSTEM COMPRISING DISPLAY APPARATUS AND SERVER AND DISPLAY APPARATUS CONTROLLING METHOD - A display apparatus is provided. The display apparatus includes: an inputter configured to receive a user's face shape and voice; a voice processor configured to analyze the input voice and extract translated data, and convert the translated data into translated voice; an image processor configured to detect information related to a mouth area of the user's face shape which corresponds to the translated data, and create a changed shape of a user's face based on the detected information related to the mouth area; and an outputter configured to output the translated voice and the changed shape of the user's face. | 12-18-2014 |
20150029362 | USER TERMINAL DEVICE AND THE CONTROL METHOD THEREOF - A user terminal apparatus is provided. The user terminal apparatus includes a camera unit configured to photograph an object, a controller configured to detect an object image from an image of the object photographed by the camera unit, generate image metadata used to change a feature part of the object image, and generate an image file by matching the object image with the image metadata, a storage configured to store the image file, and a display configured to, in response to selecting the image file, display the object image in which the feature part is changedbased on the image metadata. | 01-29-2015 |