Spatial Error Concealment with Modified Multi-directional Interpolation for H.264 Videos

• Main Authors: Chen, Tse-Yi, 陳則伊
• Other Authors: Chang, Long-Wen
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/77501506920643651220

碩士 === 國立清華大學 === 資訊工程學系 === 98 === The transmission for the video stream over the error-prone channel is the indispensable subject to discuss in nowadays. By the variant video compressed coding standards such as H.264 and MPEG4, the video stream can possess a highly compressed rate to transmit in the real-time display. However, once the packet erasures happened, it may cause severe error propagation during the decoding process. By utilizing the remaining spatial and temporal relativity to reconstruct the corrupted data, an error concealment technique at decoder becomes an individual work that will not affect the bandwidth of networks and the encoders. The discussion in this thesis is mainly attempted to introduce a refined spatial error concealment method based on the viewpoint of object-oriented manners. The original structure is based on the Multi-directional Interpolation. First of all, the distribution of edges around a lost MB is detected. Through reconstructing the edges, the missing block is then partitioned into several segments. Each segment will be interpolated directionally by available reference pixels around the segment, and at last the whole block can be restored. The proposed method provides a complete process of partitioning and modifies the order of interpolation. Therefore, we can achieve the same quality as recovered by original method while reduce the time for computing.