公开(公告)号：US20080193033A1

公开(公告)日：2008-08-14

申请号：US11996099

申请日：2006-07-19

申请人： Hae Chul Choi ,  Jae Gon Kim ,  Jin Woo Hong ,  Sung-Jea Ko

发明人： Hae Chul Choi ,  Jae Gon Kim ,  Jin Woo Hong ,  Sung-Jea Ko

IPC分类号： G06K9/36

CPC分类号： H04N19/36 ,  H04N19/124 ,  H04N19/132 ,  H04N19/147 ,  H04N19/174 ,  H04N19/19 ,  H04N19/34 ,  H04N19/61

摘要： Provided are a method and apparatus for enhancing coding efficiency by performing encoding and decoding by optimally calculating quantization intervals and reconstruction values through a distribution of DCT coefficients of each frame, when DCT coefficients of each SNR enhancement layer are quantized in scalable video coding. The encoding apparatus includes: an R-D optimization unit performing Rate-Distortion (R-D) optimization based on a distribution of Discrete Cosine Transform (DCT) coefficients each slice and calculating a first reference value and a second reference value respectively indicating a start point and an end point of DCT coefficients quantized to “0”; a quantization interval setting unit setting adaptive quantization intervals on the basis of a minimum value and a maximum value of the DCT coefficients, the first reference value, and the second reference value; and a mapping unit mapping the DCT coefficients to the adaptive quantization intervals.

摘要翻译： 提供了一种通过在可缩放视频编码中对每个SNR增强层的DCT系数进行量化时，通过每个帧的DCT系数的分布来优化计算量化间隔和重构值来进行编码和解码来提高编码效率的方法和装置。 编码装置包括：RD优化单元，其基于每个切片的离散余弦变换（DCT）系数的分布来执行速率失真（RD）优化，并且计算分别指示开始点和结束的第一参考值和第二参考值 DCT系数的量化为“0”; 量化间隔设定单元，基于DCT系数，第一参考值和第二参考值的最小值和最大值来设置自适应量化间隔; 以及将DCT系数映射到自适应量化间隔的映射单元。

公开(公告)号：US07403506B2

公开(公告)日：2008-07-22

申请号：US11141114

申请日：2005-05-31

申请人： Choong-Hun Lee ,  Kyung-Hun Jang ,  Chang-Woo Seo ,  Jin-Youn Cho ,  Hyo-Sun Hwang ,  Sung-Jea Ko ,  Chun-Su Park

发明人： Choong-Hun Lee ,  Kyung-Hun Jang ,  Chang-Woo Seo ,  Jin-Youn Cho ,  Hyo-Sun Hwang ,  Sung-Jea Ko ,  Chun-Su Park

IPC分类号： H04Q7/20

CPC分类号： H04W36/32 ,  H04W36/08 ,  H04W36/30

摘要： A handoff method is provided in a communication network including a plurality of fixed nodes attached to a router connected to at least one external network, and at least one mobile node associated with a current fixed node. The method detects movement of a mobile node; prepares a handoff of the mobile node from a current fixed node to potential fixed nodes upon detecting movement of the mobile node; decides whether to handoff to one of the potential fixed nodes as a target fixed node; and performs the handoff from the current fixed node to the target fixed node. The handoff method enables the mobile station to quickly move its association from one access point to another by minimizing a probe delay which is a primary contributor to handoff delay.

摘要翻译： 在包括连接到连接到至少一个外部网络的路由器的多个固定节点以及与当前固定节点相关联的至少一个移动节点的通信网络中提供切换方法。 该方法检测移动节点的移动; 在检测到移动节点的移动时，准备将移动节点从当前固定节点切换到潜在的固定节点; 决定是否切换到潜在固定节点之一作为目标固定节点; 并执行从当前固定节点到目标固定节点的切换。 切换方法使得移动站能够通过最小化作为切换延迟的主要贡献者的探测延迟来快速地将其关联从一个接入点移动到另一接入点。