嵌入式VGA控制器实时移动算法设计和实现

Design and Implementation of the Real-time Moving Algorithm for the Embedded VGA Controller

在安检设备对行李物件的检查过程中,VGA(视频图形阵列)显示系统需要达到图像实时移动的效果。嵌入式安检控制系统通过嵌入式VGA控制器取得这种专用性能,这给嵌入式VGA控制器的设计和实现带来了不小的挑战,特别是VGA扫描算法,其优劣性将直接影响系统整体性能。文中根据嵌入式系统实时性要求,在介绍VGA控制器的硬件设计的基础上,提出图像左右移动的VGA扫描算法及其FPGA(现场可编程门阵列)实现。该算法不仅实现灵活,更能在保证系统性能的同时,降低系统资源占用,大大减小处于前级的ARM(高级精简指令集计算机)处理器对硬件系统的开销。

During the inspecting process by the security inspection equipment, the VGA display system needs to ensure real time image moving. In the embedded control system of Security Inspection Equipment, this special effect is realized by the embedded VGA controller and it brings challenges to its design and implementation, especially for the VGA scan algorithm, which will make immediate effects on the performance of the whole system. To meet the real-time requirement, this paper introduces the design of the VGA controller and proposes one alternative of real time moving algorithm for the VGA scan, as well as the FPGA realization based on the hardware. The algorithm is smart, and more significantly, it reduces the system resources, dramatically saves the heading of the former ARM system while behaving good system performance.