数字图像实时存储系统的设计

【作者】 高岩；

【导师】 乔双；

【作者基本信息】 东北师范大学 ， 电路与系统， 2004， 硕士

【摘要】 本文论述了数字图像实时存储系统的设计过程以及该系统的实现在科学领域中的意义。数字图像由于其分辨率高、像素数目多，存储时所需的容量相当大，而且要得到平滑连续的画面效果，对速度的要求也是相当高的。该数字图像实时存储系统实现了采用n台慢速设备完成高速数据流的数据实时存储。即对95MB/s（峰值带宽为100MB/s）的高速数据流等分成四路，每一路的数据流为25MB/s，存储控制信号以像素时钟为基础进行四分频，用分频信号去控制每一路数据流的存储操作。存储器采用四块40GB希捷U Series 6 ST340810A IDE硬盘，每块硬盘平均数据传输率可达55MB/s，完全满足系统的要求。而且存储容量可以达到160GB，同时解决了速度和容量的问题。由于该系统脱离了计算机平台，整个系统的体积趋于小型化，能够机载、车载，适合于遥测。而且，IDE硬盘在目前广泛应用的大容量存储器中价格是相当便宜的，因此这是一套性价比极高的方案。在该数字图像实时存储系统的设计方案中，关键问题是解决将一路数据流等分成四路的接口部分。在设计中，引入了Lattice厂家的ispLSI系列的可编程器件。利用Lattice开发软件将数据分流接口电路部分集成到可编程器件中，使数据及控制信号串的延迟达到一致，因而使电路性能更加稳定，运行速度更快。并且采用可编程器件，使设计过程更加灵活、方便，若需更改电路，不必重新焊电路板，只需更改设计源文件，重新编译、下载即可。目前，国内在数字图像的处理和存储方面的技术还比较薄弱，尤其是实时存储技术，几乎是空白。为此，自行设计了数字实时存储系统。该系统经实际测试，工作稳定、性能可靠。该项技术的解决，将会大力促进科学研究、军事技术，尤其在航天、航空侦察，高速数据记录领域的应用发展。更多还原

【Abstract】 We discussed the design process of digital image real-time memory system and its applications in the field of scientific research in this paper.Because of high resolution rate, great amounts of pixels, enormous memory capacity is necessary, and smoothing continuous image makes high speed a must. This system realized real-time memory of high-speed data stream using several low-speed equipments. High-speed data stream of 95MB/s (peak bandwidth=100 MB/s) is divided into 4 channels and each channel is 25 MB/s. The frequency of signal is divided by 4 according to the pixel clock, and the divided frequency signal is used to control the data stream of each channel. Four XIJIE U Series 6 ST340810A IDE hard disks of 40G are used as the memory in the system. Each transmits at 55 MB/s, satisfying requirements completely. And the capacity is up to 160G, the requirements of speed and capacity are fulfilled simultaneously. The system deviated from the computer platform, its volume tends to miniaturization, therefore, it could be carried by plane and vehicle and fits remote measuring. Furthermore, IDE hard disk is considerably cheap relatively to other memories widely applied currently. This design has extremely high cost performance. During the design project of the system, the point is to resolve the interface there one data stream is divided into four. The programmable logic device (PLD) of ispLSI made by Lattice is applied. The application of Lattice development software makes it possible to integrate the interface circuits of dividing data stream into PLD and makes the delays of data and control signal consistent. Consequently the circuit gained highly stable performance and higher speed. Meanwhile if the circuit needs modification, it is unnecessary to weld PCB again, only modifying source file, recompiling and reloading are needed. Obviously the design could be more flexible and convenient.At present, the technologies of the digital signal processing and memorizing are behindhand in China and it is almost blank especially in the field of real-time memory. Therefore the digital real-time memory system is designed. The system has stable and credible performance by testing. This technology would accelerate the development of science and military technology, especially in the fields of aviation, aviation scout and high-speed data record.更多还原