Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Jae-Hoon Kwon

Do-young Joung

Sung-Kee Kim

Jae-sung Park

Yong-gyoo Kim

Chang-Hyun Lee

Tae-Sung Park

Tae-sung Park

Ji-wan Song

Yun-Je Oh

Si-Hai Wang

Young-hun Joo

Yun-Sun Baek

Yong-hyun Lim

Jeong-rok Park

Chang-Ick Kim

Jae-Seung Ko

Sou-Hwan Jung

Jae-Duck Choi

Il-Koo Ahn

Disclosed is an intelligent display method for a multimedia mobile terminal. The method includes the steps of determining a type of a camera shot existing in a sport game video; deciding a region of interest within an image frame of the sport game video when it has been determined that the camera shot is a long-distance shot, magnifying the region of interest, and displaying the region of interest on the mobile terminal, and displaying the entire image frame on the mobile terminal when it has been determined that the video shot is a non-long-distance shot. The method enables the user to watch images in a more understandable and comfortable manner.

Intelligent display method for multimedia mobile terminal

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.

Method for variably controlling bit rate of video data through end-to-end channel status sensing in a WiBro network

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.

Method and apparatus for performing video communication

The present invention relates to a device and method that enable a security key to be shared using security key exchange between two terminals, and a system that supports the same. To achieve the above, an in-house generated public key is divided into two, said two public keys that have been divided are delivered to counterpart devices via different pathways, and the two public keys delivered from counterpart devices are used to predict the public key of the counterpart device. In addition, said predicted public key is verified, and said verified public key is used to form a master key. Subsequently, said generated master key is verified, and said master key that has been verified is used to exchange data with the counterpart device.

Device and method for security key exchange and system pertaining to same

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.

Method for compressing a real-time transport protocol header extension field

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.

Method and apparatus for performing VoIP-based communication using bio keys

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.

Method for controlling moving picture encoding using channel information of wireless networks

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.

Cross-layer optimization method for controlling bit rate of video codec in transmission of video data in WiBro system

Disclosed are a wavelet transformation-based image encoder, decoder and method for generating a thumbnail image. In the present invention, an original image is tiled according to a preset tiling scheme, and wavelet transformation is performed for each tiled image. An LL image is extracted from the tiled image and range mapping is performed for the color values of each pixel of the extracted LL images. After the range mapping of the color values according to the pixels, a thumbnail image is generated by reconstructing the LL images according to the predetermined tiling scheme. According to the present invention as described above, when an encoder using a wavelet transformation method encodes the original image into a wavelet image or a decoder using wavelet transformation method decodes the wavelet encoded image into the original image, the thumbnail image can be easily generated.

Wavelet transformation-based image encoder, decoder and method for generating thumbnail image

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.

Growing community of inventors

Seongnam-si, South Korea

Jae-Hoon Kwon