公开(公告)号：EP1917772A1

公开(公告)日：2008-05-07

申请号：EP06783672.6

申请日：2006-08-21

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE ,  Industry Academic Cooperation of Kyunghee University

发明人： KWON, Jae-Kyun ,  AHN, Jae-Young ,  KIM, Yun-Hee ,  KANG, Sung-Kyo

IPC分类号： H04L27/26

CPC分类号： H04L5/023 ,  H04B7/022 ,  H04B7/0669 ,  H04W72/005

摘要： Provided are a method of providing a broadcast/multicast service in an OFDM cellular system, and a transmitting/receiving method, a transmitting/receiving apparatus and a system using the method. In the method, dividing adjacent cells transmitting the same broadcast/multicast data into a plurality of cell groups; allocating a coding method, which includes sub code that is a part of diversity code, into each of the cell groups so that a pair of transmission antennas, belonging to different cell groups, which transmit different parts of code symbols corresponding to the same data symbol vector are present; transmitting an OFDM symbol containing code symbols generated according to a coding method allocated to a cell group to which each of base stations belong; and a terminal diversity-combining reception symbols which are respectively extracted from received signals according to OFDM symbols which are respectively received from the base stations. Accordingly, it is possible to improve the receiving quality of a terminal located at a cell boundary, and coverage for specific data transmission rate.

公开(公告)号：EP2410751A1

公开(公告)日：2012-01-25

申请号：EP11185698.5

申请日：2006-10-10

申请人： Electronics and Telecommunications Research Institute ,  Industry Academic Cooperation of Kyunghee University

发明人： Park, Gwang-Hoon ,  Park, Min-Woo ,  Jeong, Se-Yoon ,  Kim, Kyu-Heon ,  Hong, Jin-Woo

IPC分类号： H04N7/26

CPC分类号： 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

摘要： 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.

摘要翻译： 由于联合可扩展视频编码（JSVC）采用根据显示图像的顺序将数字分配给所有图像的方案，因此难以检测到关键图像的下降（或丢失），因此它 难以有效地采取行动打击失败造成的关键图片错误。 本发明提供了一种通过对JSVC中的关键画面进行编号来检测关键画面的损失的编码方法，其中预测（P）画面具有闭环结构，并且在失去一个 关键图片和使用编码方法的编解码器。 SVC方法包括在向上层的关键图像分配数字的同时执行编码，并且使用下层的图像的解码图像的数据来执行相对于上层的编号编号的当前关键图像的解码 当检测到在上一层的编号编码的当前关键图像与在当前关键图像之前被编号的先前的关键图像之间的关键图像的丢失时，与上层的当前关键图像暂时匹配。 因此，通过在JSVC中通过编码密钥图像进行编码，通过连续执行闭环编码来检测在解码期间的关键图像的丢失，可以有效地采取针对由关键图像丢失引起的错误的动作 预测关键图片。 此外，当在上层的关键图像丢失的情况下，通过使用下基层的对应图像的解码图像的数据，通过隐藏由不正确参考引起的错误来降低图像质量的劣化， 通过具有多层结构的视频流来保证下基层的传输。

公开(公告)号：EP1917772A4

公开(公告)日：2012-02-22

申请号：EP06783672

申请日：2006-08-21

申请人： KOREA ELECTRONICS TELECOMM ,  INDUSTRY ACADEMIC COOPERATION OF KYUNGHEE UNIVERSITY

发明人： KWON JAE-KYUN ,  AHN JAE-YOUNG ,  KIM YUN-HEE ,  KANG SUNG-KYO

IPC分类号： H04L27/26

CPC分类号： H04L5/023 ,  H04B7/022 ,  H04B7/0669 ,  H04W72/005

公开(公告)号：EP1935180A1

公开(公告)日：2008-06-25

申请号：EP06799153.9

申请日：2006-10-10

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE ,  Industry Academic Cooperation of Kyunghee University

发明人： PARK, Gwang-Hoon ,  PARK, Min-Woo ,  JEONG, Se-Yoon ,  KIM, Kyu-Heon ,  HONG, Jin-Woo

IPC分类号： H04N7/24

CPC分类号： 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

摘要： 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.