A method of color image single-channel encryption is proposed. The proposed method uses tricolor grating to encode a color image into a gray level image, then the gray level image is encrypted by double random phase e...A method of color image single-channel encryption is proposed. The proposed method uses tricolor grating to encode a color image into a gray level image, then the gray level image is encrypted by double random phase encryption, so a color image is encrypted in a single-channel and its security is ensured. Computer simulations and the chromatic aberration analysis are given to prove the possibility of the proposed idea.The optical system is simpler and is easy to be applied into practice. The simulation resu...展开更多
基金supported by the Opening Subject of KeyLaboratory of Opoelectronic Information Science & Technology,Ministry of Education of China(Grant No. 2005-141)
文摘A method of color image single-channel encryption is proposed. The proposed method uses tricolor grating to encode a color image into a gray level image, then the gray level image is encrypted by double random phase encryption, so a color image is encrypted in a single-channel and its security is ensured. Computer simulations and the chromatic aberration analysis are given to prove the possibility of the proposed idea.The optical system is simpler and is easy to be applied into practice. The simulation resu...
文摘在多模态脑机接口(Brain-computer interface,BCI)研究中,通道选择是直接影响系统性能的关键因素。针对脑电图(Electroencephalogram,EEG)和功能性近红外光谱(Functional near-infrared spectroscopy,fNIRS)各自通道之间存在冗余信息和噪声干扰,本文提出了一种基于PF(Pearson-Fisher,PF)系数的通道选择方法。首先将表征信号间相关性的Pearson系数与表征特征间可分性的Fisher值相结合,构建代表任务区分性的PF系数,并设置合理阈值对通道进行选择。然后提取EEG中的共空间模式(Common space pattern,CSP)特征和fNIRS中的统计特征。最后通过收缩线性判别分析(Shrinking linear discriminant analysis,SLDA)分类器进行分类。在对心理算数(Mental arithmetic,MA)任务数据的分类实验中,本文所提出方法分类精度可以达到90.8%,表明了该方法的有效性和鲁棒性。
基金supported by China Postdoctoral Science Foundation (No. 2018M630011)the National Natural Science Foundation of China (No. 31600879+2 种基金 31671125)the Research Team’s Construction Project from the Faculty of Psychology in Southwest University China (No. TR201201-1)
