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An error detecting method which can prevent the decoding error affecting the next video packet head is used , and a restoration measure for b frame based on the mv prediction which can improve the visual quality has been studied . 3 . a novel marking algorithm for ip diffserv based on the transmission condition and the different importance of video streams for decoder has been introduced 2实现了mpeg - 4的差错检测、可逆变长解码rvld和差错掩盖方法:对i或p帧纹理区的差错先用rvld进行解码,然后对残留的差错用空间插值或运动补偿方法进行掩盖,而对p帧的运动矢量mv ,利用图像的空间平滑特性进行恢复; 3针对b帧差错的复原,我们还提出了一种基于运动估计的方法。
The research area covered by the thesis includes embedded system design , hardware infrastructure of embedded gis system , architecture of nand flash , error detect code / error check code and there algorithm , journal file system , gis file index , wear leveling for nand flash , file system page cache and write delay , dynamic compression in file system etc . first , the thesis first analysis the embedded gis status in quo , technology background , difficulty it facing 本文研究领域涉及嵌入式系统开发、嵌入式gis系统软硬件框架、 nand芯片体系结构、差错检测差错校验( edc ecc )算法、日志文件系统、文件索引、芯片擦写平衡、文件系统页面cache与延迟写技术、文件系统实时压缩等技术。
