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公开(公告)号：KR1020060054080A
公开(公告)日：2006-05-22
申请号：KR1020050098147
申请日：2005-10-18
IPC: H04N19/177 , H04N19/51
CPC classification number: H04N19/615 , H04N19/114 , H04N19/13 , H04N19/146 , H04N19/147 , H04N19/177 , H04N19/192 , H04N19/31 , H04N19/436 , H04N19/61 , H04N19/63 , H04N19/70
Abstract: Provided is a method for performing motion compensated temporal filtering (MCTF)-based coding on a video sequence using the structure of adaptively divided group of pictures (GOP). The method includes the steps of, for each predefined 2
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公开(公告)号：KR100825737B1
公开(公告)日：2008-04-29
申请号：KR1020060098098
申请日：2006-10-09
IPC: H04N19/30 , H04N19/177 , H04N19/895
CPC classification number: H04N21/2383 , H04N19/29 , H04N19/33 , H04N19/44 , H04N19/46 , H04N19/503 , H04N19/61 , H04N19/70 , H04N19/89 , H04N19/895 , H04N21/2402 , H04N21/2404 , H04N21/2662 , H04N21/40
Abstract: 본 발명은 GOP 단위를 구분하는 키 픽쳐들 간에 연속적인 예측에 의한 폐루프 코딩을 수행하는 스케일러블 비디오 코딩 방법 및 그 방법을 이용하는 코덱을 제공한다.
상기 스케일러블 비디오 코딩 방법은 상위 계층의 키 픽쳐에 순차적으로 번호를 부여하면서 인코딩하고, 상기 번호 인코딩되어 입력되는 상위 계층의 현재 키 픽쳐와 상기 현재 키 픽쳐 이전에 번호 인코딩되어 입력된 과거 키 픽쳐 사이에 키 픽쳐 손실을 검출하여 디코딩한다. 또한, 하위 기본 계층의 전송이 보장되는 경우 상기 키 픽쳐 손실시 하위계층의 정보를 이용하여 에러를 은닉하여 디코딩할 수 있다.
따라서, 키 픽쳐 넘버링을 통해 키 픽쳐의 손실의 여부를 알아내어 손실에 의한 에러에 효과적으로 대처할 수 있고, 하위 기본 계층의 전송이 보장되는 경우 상위 계층의 키 픽쳐 손실시 하위 계층의 대응 픽쳐의 디코딩된 영상 정보를 이용함으로써 잘못된 참조에 의해 발생하는 에러를 은닉함으로써 영상 품질 저하를 최소화할 수 있다.
SVC, 키 픽쳐, 넘버링, 에러 전파, 에러 은닉, 디코딩-
公开(公告)号：KR1020070040303A
公开(公告)日：2007-04-16
申请号：KR1020060098098
申请日：2006-10-09
IPC: H04N19/30 , H04N19/177 , H04N19/895
CPC classification number: H04N21/2383 , H04N19/29 , H04N19/33 , H04N19/44 , H04N19/46 , H04N19/503 , H04N19/61 , H04N19/70 , H04N19/89 , H04N19/895 , H04N21/2402 , H04N21/2404 , H04N21/2662 , H04N21/40
Abstract: Since joint scalable video coding (JSVC) adopts a scheme in which numbers are assigned to all of the pictures according to the order in which the pictures are displayed, it is difficult to detect a drop (or loss) of a key picture and thus it is difficult to effectively take action against an error caused by the loss of the key picture. The present invention provides a coding method of detecting a loss of a key picture by numbering key pictures in JSVC in which predictive (P) pictures have a closed-loop structure and of effectively taking action against an error in the case of a loss of a key picture, and a codec using the coding method. The SVC method includes performing encoding while assigning a number to a key picture of an upper layer and performing decoding with respect to the number- encoded current key picture of the upper layer using data of a decoded image of a picture of a lower layer that is temporally matched with the current key picture of the upper layer when a loss of a key picture between the number-encoded current key picture of the upper layer and a previous key picture that is number-encoded prior to the current key picture is detected. Therefore, it is possible to effectively take action against to an error caused by a loss of a key picture by detecting the loss of a key picture during decoding by encoding using numbering of key pictures in JSVC in which closed-loop coding is performed by consecutively predicting key pictures. Moreover, it is possible to minimize degradation in image quality by concealing an error caused by an incorrect reference by using data of a decoded image of a corresponding picture of a lower base layer when a key picture of an upper layer is lost in an environment where transmission of the lower base layer is guaranteed with a video stream having a multi-layered structure.
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