Abstract:
A method for compensating for image information disparity through contrast correction and a method and an apparatus for decoding/encoding a multi-view video by using the compensating method are provided to improve a prediction coding efficiency when an average difference or a contrast difference exists in the image information of two images. The contrast of a reference image having a view different from that of a present image is corrected(S21). A prediction image of the present image is created by using image information of the corrected reference image. The contrast is corrected by using contrast correction information of the input image. The contrast correction information of the image includes information about a correction scheme. The image information of the prediction image is identical to the image information of the reference image.
Abstract:
PURPOSE: A distributed motion estimation method in a video encoder is provided to accurately predict movement while keeping complexity of a video encoder lower to increase accuracy of channel modeling, thereby increasing compressing efficiency. CONSTITUTION: A distributed motion estimation method in a video encoder comprises the following steps. A total prediction step number for phased motion prediction about current frame data is determined using previous frame data. A motion vector is generated by performing motion prediction about current frame data as many as real prediction steps whose number is lower than total prediction step number. The total prediction step number, real prediction step number and motion vector are transmitted to a decoder.
Abstract:
콘트라스트 보정에 의한 이미지 정보 변이의 보상 방법 및 이를 이용한 다시점 영상의 부호화 방법 및 장치와 복호화 방법 및 장치에 관하여 개시한다. 본 발명에서는 다시점 영상에서 뷰간 예측 효율을 높이기 위하여 참조 영상을 현재 영상에 맞도록 이미지 정보의 콘트라스트 보정 및/또는 이미지 정보의 평균에 대한 보정을 수행한 다음, 보정된 참조 영상의 이미지 정보를 이용하여 차분 펄스 부호 변조에 기반한 부호화 및 복호화를 수행한다. 이러한 본 발명에 의하면, 다시점 영상의 부호화 및 복호화에서 뷰간 예측 효율을 높임으로써 인트라 블록의 발생을 줄이고 부호화 효율을 향상시킬 수가 있다. MPEG, 스케일러블 비디오 코딩, 다시점 비디오 코딩, 휘도보상(Illumination Compensation), 색채 보상(Chrominance Compensation), 시간방향 예측코딩 (Temporal Predictive Coding)
Abstract:
PURPOSE: A method for reducing experience quality reduction of a multimedia service in a multimedia system and a device thereof are provided to minimize reduction of QoE(Quality of Experience) due to delay. CONSTITUTION: A buffer buffers a multimedia stream. A controller reproduces a second multimedia stream through a display unit during a period of time during which the buffer needs to buffer a multimedia stream corresponding to a specific command when the specific command related to reproduction is executed. After buffering, the controller reproduces the multimedia stream corresponding to the specific command through the display unit.
Abstract:
PURPOSE: A method and apparatus for reconstructing bit streams for a distributed video coding are provided to reduce the complexity of an encoder as well as a decoder. CONSTITUTION: In a DVC(Distributed Video Coding), a method and apparatus for reconstructing bit streams for a distributed video coding comprises steps of: restoring an image by decoding an existing bit streams and the received DVC bit streams; calculating motion information about a current image using the restored image; determining a data transmitting rate by comparing the difference between a current image and a second additional information image which is created by the existing DVC decoding method; and transmitting the DVC bit streams to the DVC decoder(110).
Abstract:
PURPOSE: A method and relay station for transmitting a data packet are provided to reduce the burden of a server in data transmission for providing a stable and efficient multimedia broadcast/multicast service. CONSTITUTION: If a received data packet is overlapped or not decoded, a decoding unit(230) stores and decodes the received data packet. A raptor code(240) re-encodes the decoded data packet by using a raptor code. The raptor code generates the raptor code packet. A data packet re-transmission unit(250) retransmits the raptor code packet to a reception client terminal which is an end node. A layer ratio determination unit(260) differentiates the transmission rate of a raptor code packet depending on each layer according to the network circumference of a transmission path in a limited band width.
Abstract:
A spatial scalable decoding apparatus using up-sampling based on directional information and a spatial scalable decoding method using the same are provided to efficiently spatial redundancy between layers by using up-sampling filters having different directional properties by regions based on information obtained from intra-prediction. Directional information of a corresponding block is obtained through intra-prediction in accordance with an input of a base layer decoding block(701). The base layer decoding block is up-sampled by an up-sampling method according to the obtained directional information(702). A high layer decoding block which corresponds to the base layer decoding block is decoded(703). The directional information is obtained if the inputted base layer decoding block is an intra-frame and a directional filtering option is set.