基于帧频信号的图像存储时序控制方法

Image Storage Sequential Control Method Based on Frequency Signal

针对长时间服役光学设备图像存储系统性能退化和可靠性降低的问题,设计了新的图像存储系统结构;提出了一种基于帧频信号的时序控制方法,以帧频信号为基准驱动系统软硬件工作,结合秒信号、帧频信号与串口时间生成绝对时间,实现了四路独立数据流的同步采集,通过两级缓存机制保证数据采集-打包-存储之间的速率冗余匹配,对图像转移时间误差进行了修正;检测结果表明,系统时序得到了有效控制,长时间采集存储数据稳定可靠不丢帧,时间同步精度优于1ms。

The image storage system of optical devices, which have been serving for a long time, have problems of performance degrada- tion and reliability reduction, a new image storage system structure is designed aim at this situation. A sequential control method base on fre- quency signal is proposed, driving the hardware and software of the image storage system with the frequency signal, generating absolute time by combining second signal, frequency signal and time information from serial port, implements the four independent synchronous data acqui- sition, two levels of cache mechanism is raised up to ensure the redundant matching of data rate between collection, packaging, and storing, the image transfer time error is corrected. Test results show that, the image storage system sequence has been effectively controlled, the data collection and storage is stable and reliable for a long time without losing a frame of image, the accuracy of time synchronization is better than 1 ms.