利用DMA模块的图像采集处理系统的优化设计

Optimized Design of Image Acquisition and Processing System Based on DMA Module

提出了一种利用DSP片内DMA模块进行数据搬移和存储处理,并应用于身份证识别系统的优化设计方案。该方案主要是基于原系统无法满足高速、大量的A/D采样数据的存储和处理而进行设计的。利用DMA的高效性和实时性,将A/D采样数据通过DMA模块再通过并口XINTF直接存储到片外SDRAM中,同时处理后的信号也可以直接通过USB3.0发送到上位机,提供一条高效的数据通路。在完成新系统的CMOS图像传感器、光电传感器、DSP、FPGA、SDRAM和USB3.0接口等硬件的功能实现后,最后测试验证了优化设计后的系统是可实行的,并能适应更广泛的使用领域。

A scheme to optimize and design the ID identification system is proposed,which is based on the DSP on-chip DMA module for data transfer and storage.This scheme is designed because the original system can not satisfy the storage and processing of high-speed,large-scale A/D sampling data.Using the efficiency and real-time nature of DMA,the A/D sampling data is directly stored in the off-chip SDRAM through the DMA module and the parallel port XINTF and the processed data at the same time could also be sent directly to the host computer through USB3.0 to provide an efficient data path.The hardware functions of the new system such as CMOS image sensors,photoelectric sensors,DSP,FPGA,SDRAM and USB interfaces are implemented.Finally,the correctness of the optimization system is verified and can be used in wide range of fields.