双抽头CCD图像整合优化设计

为了解决双抽头CCD输出图像顺序不一致的问题,提出了一种改进的RAM软件设计方法,并对其数据进行重新整合。首先,利用XILINX VIRTEX系列现场可编程门阵列(FPGA)的内部Block RAM构造形成双端口RAM。其次,利用双抽头CCD的第一个抽头数据在整合前后没有变化的特点,改进了传统的乒乓操作方法,实现了对整片CCD输出的整合。与传统的图像整合方法相比,该方法对硬件的资源占用率节省了25%。利用ModelSim软件对该方法进行仿真实验,验证了其正确性和有效性。该方法节约了硬件资源,降低了硬件成本,并已成功应用在实际工程项目中。

Optimization design of image conformity for double-tap CCD

In order to modify the disaccord of output sequency of a double-tap Charge Coupled Device(CCD), an improved design method for software RAM is proposed, and the output of CCD is conformed by this method. Firstly, a dual-port RAM is constructed by using Block RAM of Xilinx Virtex series Field Programmable Gate Array(FPGA). Since the sequence of data from tap1 is the same as that to be conformed before, this paper comes up with an improved method based on the traditional Ping-Pang operation to conform the output data from the CCD. Comparing to the traditional Ping-Pang method, the resource consumption of designed software is greatly reduced by 25%. It is proved to be valid and accurate by the simulation result of ModelSim. The new method which has been applied in the project successfully can save hardware resources and reduce the hardware cost greatly.