Two vertical-cavity surface-emitting lasers (VCSELs) are mutually coupled through a partially transparent mirror (PTM) placed in the pathway.The PTM plays the role of external mirror,which controls the feedback strength and coupling strength.We numerically simulate this system by establishing a visible SIMULINK model.The results demonstrate that the anticipation synchronization is achieved and it can tolerate some extent frequency detuning.Moreover,the system shows similar chaos-pass filtering effect on unidirectionally coupled system even both VCSELs are modulated.This system allows simultaneously bidirectional secure message transmission on public channels.
超分辨率重建在视频监控、高清晰度电视、遥感图像、医学图像处理等领域具有广阔的应用前景.最大后验估计(maximum a posteriori,MAP)法是普遍采用的一种超分辨率重建方法.针对传统MAP法存在的局限性,本文提出了一种基于MAP框架的时空联合自适应视频序列超分辨率重建算法.时空联合自适应机制的引入使得算法在保持边缘的同时可减小错误运动估计矢量对重建图像质量的影响.实验结果表明,算法具有重建质量好、边缘保持能力强、收敛速度快等特点.
