【作者】 黄飞；

【导师】 吴敏渊；

【作者基本信息】 武汉大学 ， 信号与信息处理， 2004， 硕士

【摘要】 本课题是“成像地检设备的研制与设计”的一部分，研究的主要内容是接收CCD相机通过Camera Link接口传送过来的88路10bit／10MHz的图像数据，对其中的每四路信号进行复接，得到一路10bit／40M的视频信号，然后将复接后的22路信号通过Camera Link接口输出给后端处理单元。 当前，在绝大部分应用中实施数字复接的主要方法是按位复接，并且是在各种规定等级上用专用芯片或模拟电路来实现的。虽在近几年中也有采用可编程逻辑器件来实现数字复接技术，但基本上局限于按位复接和按字节复接的方法。按位复接和按字节复接设备简单，容易实现，但是在复接时破坏了各输入支路的帧结构，并且需要插入各种同步码，没有充分利用Camera Link接口中的视频同步信号。在对目前的复接方法仔细研究后，本文采用了按帧复接的方法并对其进行改进后用CPLD实现，这种方法充分利用了Camera Link接口中的视频同步信号，仅对各输入支路的视频数据信号进行复接，而没有复接视频同步信号，不需要插入控制码流。因此，后端的处理单元不需要特定的分接器也可以轻易实现分接。另外，该方法对输入支路上出现的传输延误有较强的纠正性，是一个具有较强鲁棒性的复接系统。更多还原

【Abstract】 This subject is a part of "Imaging Inspection for Ground System ", which receives 88 channels image data of 10bit/10MHz from CCD, save and display it at the same time. This subject is the pre-processing part of the whole system, it receives image data from CCD and multiplexes four tributary signals into one channel signal that is image data of 10bit/40MHzoBut in most applications, the implementation of digital multiplexer adopt multiplexing based on bit primarily by Application Specific Intergrated Circuit (ASIC) or analog circuit on specified orders. Although in recent years, Programmable Logic Device(PLD)has been used in digital multiplexing, they are limited to multiplexing based on bit and multiplexing based on byte. These methods are easily implemented and required simple equipment, but they destroy frame structure and require to insert some synchronous code?In addition, these method can’t utilize synchronous signal of Camera Link Interface Standard effectively. After careful research of current multiplex methods, the paper adopts and improve multiplexing based on frame and implement it by CPLD. The method ultize synchronous signal of Camera Link effectively and needn’t insert synchronous code in multiplexed signal.Thus, the followed processing DSP unit can implement demultiplexing easily even without given demultiplexer. In addition, the method can strongly correct some error caused by delaying on input . It is a good robustness system.更多还原