Abstract:
An available bandwidth measure system between terminations for streaming multimedia and a method thereof are provided to reduce the deterioration of image quality by preventing packet loss by exceeding bandwidth of wireless network. A pair of packet are transmitted to a client from a streaming server. The time difference between packets is fed back from corresponding client. An available bandwidth is predicted in the streaming server corresponding to time difference. The data encoding bit rate is controlled in the streaming server corresponding to the available bandwidth.
Abstract:
1. 청구범위에 기재된 발명이 속한 기술분야 본 발명은 차분신호의 크기와 부호의 분리를 이용한 동영상 부호화/복호화 장치 및 그 방법에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은 차분신호(현재 부호화대상이 되는 원영상과 그 원영상에 대한 예측 영상 간의 차이)를 크기와 부호로 분리하여, 크기 신호에 대해서만 변환부호화 및 양자화를 수행하고 부호 정보는 수신 측에서 복호화에 이용할 수 있도록 별도로 전송함으로써, 변환부호화의 성능 개선을 통하여 동영상 부호화의 효율을 향상시킬 수 있는, 차분신호의 크기와 부호의 분리를 이용한 동영상 부호화/복호화 장치 및 그 방법을 제공하는데 그 목적이 있음. 3. 발명의 해결방법의 요지 본 발명은, 차분신호의 크기와 부호의 분리를 이용한 동영상 부호화 장치에 있어서, 현재 부호화 대상이 되는 원영상에 대하여 예측 영상을 생성하기 위한 영상 예측 수단; 상기 원영상과 상기 예측 영상 간의 차분신호를 생성하기 위한 차분신호 생성 수단; 상기 차분신호로부터 크기와 상기 차분신호의 복원에 필요한 부호비트(보상용 부호비트)를 생성하기 위한 크기/부호 분리 수단; 상기 차분신호 크기에 대해서는 변환부호화, 양자화, 및 엔트로피 인코딩을 수행하고, 상기 보상용 부호비트에 대해서는 엔트로피 인코딩을 수행하기 위한 부호화 수단; 및 상기 부호화 수단에서 변환부호화 및 양자화된 차분신호 크기를 역변환하여 원래의 차분신호로 복원한 후 상기 보상용 부호비트를 이용하여 부호 보상하고, 상기 부호보상된 차분신호에 움직임 보상함으로써 원 영상을 복원하여 새로운 기준영상으로 저장하기 위한 복호화 수단을 포함함. 4. 발명의 중요한 용도 본 발명은 동영상 부호화/복호화 장치 등에 이용됨. 변환부호화, 이산여현변환(DCT), 영상부호화, 영상압축, 차분신호, 보상용 부호비트
Abstract:
An apparatus and a method for transmitting and receiving hierarchical modulation of scalable video bit stream are provided to solve a problem that a video compression standard H.264 used in the existing terrestrial DMB(Digital Multimedia Broadcasting) does not provide a scalability function that provides various screen resolutions/time resolutions/picture qualities, failing to provide a one-source multi-use service. An HP(High Priority) channel generating unit(812) generates an HP bit stream having an HP based on a base layer among a plurality of scalable layers included in a single scalable video bit stream. An LP(Low Priority) channel generating unit(813) generates an LP bit stream having an LP based on an enhancement layer among the scalable layers included in the single scalable video bit stream. A splitter(810). A splitter header parcing unit(812) parses an NAL(Network Layer Access) header included in an NAL unit of the received scalable video bit stream and discriminates the received scalable video bit stream as the base layer and the enhancement layer.
Abstract:
A method and an apparatus for performing error resistance encoding/decoding using an RCP(Redundant Coded Picture) slice obtained from a selective PCP(Primary Coded Picture) are provided to generate RCP data from selective videos in an encoding end and generate a parity slice by using the RCPs, thereby providing a degree of freedom for generating the parity slice and controlling the amount of the parity slices in an entire bit stream. An ROI(Region Of Interest) setup unit sets at least one or more ROIs by using FMO(Flexible Macroblock Ordering) to a selective PCP(Primary Coded Picture). A redundant picture generating unit(110) generates an RCP(Redundant Coded Picture) for one or more ROIs. A parity slice generating unit(120) generates a parity slice including a frame number of a PCP about parity bit generation and a parity bit generated by performing RS(Reed-Solomon) encoding of the RCP.
Abstract:
An apparatus and a method for encoding/decoding a video by using separation of amplitude and sign of a differential signal are provided to take an absolute value for a differential signal generated after motion prediction, thereby improving the correlation of pixels within a block where DCT(Discrete Cosine Transform) will be performed and accordingly increasing compression efficiency. A video prediction unit generates a prediction video with respect to an original video as an object for current encoding. A differential signal generating unit generates a differential signal between the original video and the prediction video. An amplitude/sign separating unit generates a sign bit(sign bit for compensation) for performing restoring of the differential signal and amplitude from the differential signal. An encoding unit performs transform encoding, quantization and entropy encoding with respect to the differential signal amplitude, and performs entropy encoding of the sign bit for compensation. A decoding unit performs inverse-transform of the differential signal amplitude, transform-encoded and quantized in the encoding unit, so as to perform restore into the original differential signal. By performing sign compensation by using the sign bit for compensation and performing motion compensation for the sign-compensated differential signal, the decoding unit restores the original video and stores the restored original video as a new reference video.
Abstract:
An apparatus and a method for video encoding, using a signal separation algorithm based on independent component analysis are provided to improve an existing video coding scheme having a limitation in video compression efficiency for each macro block. A centering unit regulates data average of a residual image of a macro block delivered from a DCT transformer unit. A copy/conversion unit copies and transforms the residual image of the macro block adjusted in the centering unit to create a residual image having the same dimension as the dimension of the image before an encoding operation. An image separation unit separates a macro block data approximating to original data from the residual image having the macro block generated in the copy/conversion unit through a bland source separation(BSS) algorithm.
Abstract:
A method for improving data sharing in an SVC(Scalable Video Coding) file format is provided to avoid the repetition of data with respect to a common part of meta data according to tracks to obtain the reduction effect of storing capacity. An ID designating a track and an ID designating a layer are formed in meta data. All the metal data designating the same layer refers to original meta data to prevent the same presentation of the original meta data from being repeatedly copied. When tracks having the same presentation are formed as one scalable base track and several sub-tracks, references capable of searching the scalable base track is formed in the respective sub-tracks to search all the tracks having the same presentation.
Abstract:
A method for sharing video data in an SVC(Scalable Video Coding) file format by using a chunk descriptor is provided to perform a random access by a scalable layer unit in one frame. One frame is formed as one or more scalable layers(L1-L3). The respective scalable layers(L1-L3) are classified by the minimum unit such as an NALU(Network Abstraction Layer Unit). A random access unit is set up in one frame by the NALU to be capable of performing a random access by a scalable layer unit. The random access unit is set up by a byte unit to secure a perfect random access.
Abstract:
A method and an apparatus for encoding and decoding the bitstream of a moving picture by using a switching picture are provided to give various functions for an extended moving picture by combining a scalable moving picture encoding technology with a switching picture technology. An improved layer picture in an improved picture bitstream is encoded into a comparative switching picture and a replacement switching picture in the process of reproducing a picture on a predetermined basic layer in a basic layer bitstream in an apparatus for decoding the bitstream of a moving picture. The improved layer picture represents an image enabling continuous reproduction with the picture on the basic layer. The comparative switching picture is obtained by encoding an original image through prediction based on an encoded image of a basic layer picture and an improved layer picture. The replacement switching picture is obtained by encoding the comparative switching picture through inter-layer prediction based on an encoded image of the basic layer picture.
Abstract:
본 발명의 목적은 동일한 포맷의 멀티미디어 파일을 미디어 자원으로서 포함할 수 있는 확장된 멀티미디어 파일 포맷 구조를 제공하는데 있으며, 본 발명에 따른 멀티미디어 파일은, 메타데이터 영역 및 미디어데이터 영역으로 이루어지며, 상기 메타데이터 영역은 미디어 객체 정의 필드; 및 다수개의 트랙 포인터를 포함하며, 상기 미디어데이터 영역은 상기 각 트랙 포인터가 가리키는 미디어 블록 다수개를 포함한다. 여기에서 상기 트랙 포인터 중 하나 이상은 내장 또는 외부의 멀티미디어 파일에 포함되는 세부 미디어 자원을 엑세스 할 수 있는 것을 특징으로 한다. 본 발명에 따르면, 특히, MPEG4 파일 포맷에서 내장되는 서브 MPEG4 파일의 세부 미디어 자원의 위치 정보를 표준화함으로써, 미디어 자원에 대한 효율적인 접근 및 재생이 가능하게 되는 효과가 있다. 미디어 자원, MPEG4, 어드레싱, 메타데이터, 멀티미디어