【作者】 冯万梅；

【导师】 范平志；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2004， 硕士

【摘要】 在现有基于MJPEG算法、小波算法、MPEG1和MPEG2算法的视频存储系统中，前两种系统的压缩比较低且格式非标准化，而后两种系统则应兼顾压缩比与画面质量矛盾。分析表明，基于RAID卡、光纤通道、IEEE 1394和USB接口方式的多硬盘存储方法存在价格昂贵、可靠性差、组建复杂及通信速率低等缺点。为了提高视频存储容量及性价比，使视频存储系统的图像质量符合ISO／IEC最新的标准，有必要对视频存储系统进行改进。本论文将致力于MPEG4多硬盘视频存储系统的设计与实现。 本项研究采用美国VB公司的压缩芯片，设计并实现了基于MPEG4的图像存储系统。由于采用了硬件压缩方式，本图像存储系统处理速度快，实时性好。通过采用可变码流压缩，静止的图像采用较低的码流，运动的图像采用较高的码流，这样既不影响图像质量也不浪费存储空间。在相同环境和相同码流的条件下，本系统与采用其他压缩算法的系统相比，画面质量高，相同的画面进行网络传输实时性好，由此验证了本系统压缩比更高。 在相关研究基础上，本文还提出了一种新的多硬盘视频存储方法。该方法融合现有的计算机硬盘设计方法，不改变硬盘的原有工作模式，只是增加一片逻辑芯片和三个74HC16245驱动器，便可实现16个硬盘的存储方式。这种多硬盘系统由于同一时间只有一个硬盘在工作，没有额外占用CPU资源，因此在提高存储量的同时没有降低系统的工作效率。从而达到系统较高的稳定性。更多还原

【Abstract】 Among the existing video storage systems based on MJPEG algorithm, wavellet algorithm, MPEG1 and MPEG2 algorithm, the first two systems have low compress ratio and nonstandard format, while the last two systems need to be compromised between the compression ratio and the picture quality. Our analysis shows that these methods are either expensive, not reliable, complacated, or having low data rate. To accord with the ISO/IEC standard and meet the requirment of large storage, it is necessary to improve the present video storage system. This thesis aims at the design and realization of MPEG4-based multiple hard disk for video storage.By choosing hardware compression chips from VB Coporation (USA), the system can process the picture in high speed and real time. The system has variable bit rate, hence low bit rate for still pictures and high bit rate for moving pictures. In this way, the system achieves both the high picture quality and reduced storage space. By comparision with other video storage systems in the same enviroment, the result shows that this system has higher picture quality and realtime quality for web transmission.Based on the related research, this thesis proposes a new method in building multi hard disk storage system. With this method, a new storage system with 16 hard disk is realized by keeping the present computer hard disk design, adding a CPLD chip and three 74HC16245 gate drivers. The multi hard disk system improves the storage capcity with high stability and high efficiency since there is only one hard disk in operation at anytime, no additional CPU resource is consumed.更多还原