The dissertation compiles and develops error resilience function module, which is based on mpeg-4 ( iso 14496 ) video part that is compatible with first generation and is ground on visual object . it is founded on familiarity with syntax and semantic of mpeg-4 video . and the decoder refers to no error resilience deocder and decodes mpeg-4 iso encoder coded video data streams 本文以国际压缩标准mpeg-4(iso14496)这一兼容第一代压缩算法的基于视频对象的视频部分iso14496-2)为平台,在熟悉mpeg-4视频流语法和语义的基础上,对mpeg-4iso-encoder视频编码器编码的数据流,参照其没有错误恢复的视频解码器,编写、增加视频容错算法处理模块。
Then, the syntaxes and semantics of rcl are defined and the process of mental states transition and inter-agent negotiation are described . moreover, after introducing the main problems in mrs architecture briefly, three important architectures-reactive architecture, deliberate architecture and hybrid architecture are discussed 接下来,本文在简要介绍了多机器人体系结构主要解决的问题之后,给出了目前流行的三种体系结构??反应结构、慎思结构和混合结构。
According to the program structure of ansi c, some syntax-tree-nodes are designed in front-end, including function, block, data structure, type, expression, identifier and so on . syntax tree is divided into three levels, namely program level, function level and block level, which are useful for analysis of syntax and semantic in compiler as well as transferring syntax tree into rtl . retargetable compiler mainly includes intermediate representation, machine description and interface technique between compiler and machine description 编译前端的实现技术包括词法分析、语法语义分析和中间代码生成技术等,针对ansic的程序结构,分别设计了函数、块、数据结构、类型、表达式、标识符等语法树结点,并将语法树分成编译层次、函数声明和块三个不同层次,使语法树具有清晰的层次结构,有利于编译程序的语法和语义分析,以及从语法树到rtl中间表示的转换。
After in-depth study on the auto-construction technology of compliers, a method is presented that the complier capture the lexical, syntax and semantic errors from source codes by setting up three classes of error traps in advance, to report the sort of the errors more exactly, compile part fault-tolerantly and reduce the ascending series errors 通过对编译程序自动构造技术的深入研究,提出了一种预置三级错误陷阱来分别俘获源程序词法、语法、语义错误的思想,使编译器能更准确地报告错误的性质、部分容错编译并减少错误级联。
The paper introduces the technique of the recommendation on the basic frame, encoder and decoder's main technique and regulation, the syntax and semantics of the bitstream, optional coding algorithm, and etc . in the forth part of the paper, aimed the time-costest and most important technique-discrete cosine transform ( dct ) and motion estimate algorithms, paper analyses the classical and practical algorithms and introduce the theory . then paper sum up all the algorithms character, give out the ameliorated algorithm, and simulate with the c language on the computer . these two algorithm, can be realized using hardware and can be used into the real videophone's video module 论文的第四部分,针对可视电话中最耗费计算时间,也是其中最关键的技术??离散余弦变换(dct)和运动估计算法进行的仔细的研究,分析了当前出现的经典的实用算法,并对其原理进行了研究和介绍,并总结各种算法的特点和原理,各自提出了其的改进算法,给出了其原理介绍和实现方法,并在计算机上使用c语言进行了仿真试验,并达到了较为满意的效果,这两种算法,完全可以通过硬件得以实现并能应用到实际的可视电话的视频模块压缩算法中去。
Firstly, the paper analyses the features of xml and the differences between xml and some other traditional technologies; also, the paper discusses the syntax and semantics of xml, the parsing of xml document ( dom & sax ) and etc . besides, the paper researches an important application of xml-- smil2 论文首先对xml技术的特点、xml与传统技术的区别进行了分析,并探讨了xml的语法、语义以及xml文档的解析和数据处理方法(dom和sax)等问题。之后,论文研究了xml的一个重要应用??smil2.0规范。