ABSTRACT
Gait recognition is one of the important research directions of biometric authentication technology. However, in practical applications, the original gait data is often short, and a long and complete gait video is required for successful recognition. Also, the gait images from different views have a great influence on the recognition effect. To address the above problems, we designed a gait data generation network for expanding the cross-view image data required for gait recognition, which provides sufficient data input for feature extraction branching with gait silhouette as the criterion. In addition, we propose a gait motion feature extraction network based on regional time-series coding. By independently time-series coding the joint motion data within different regions of the body, and then combining the time-series data features of each region with secondary coding, we obtain the unique motion relationships between regions of the body. Finally, bilinear matrix decomposition pooling is used to fuse spatial silhouette features and motion time-series features to obtain complete gait recognition under shorter time-length video input. We use the OUMVLP-Pose and CASIA-B datasets to validate the silhouette image branching and motion time-series branching, respectively, and employ evaluation metrics such as IS entropy value and Rank-1 accuracy to demonstrate the effectiveness of our design network. Finally, we also collect gait-motion data in the real world and test them in a complete two-branch fusion network. The experimental results show that the network we designed can effectively extract the time-series features of human motion and achieve the expansion of multi-view gait data. The real-world tests also prove that our designed method has good results and feasibility in the problem of gait recognition with short-time video as input data.
ABSTRACT
The ultra-long optical fiber of an optoelectronic oscillator (OEO) and the high spectral purity of its high frequency oscillation signal open the possibility of high-accuracy distance measurements at a long range. However, the longer the fiber length in an OEO, the more prone the system is to surrounding disturbance, which in turn leads to fluctuation of the loop delay and a reduction in distance measurement accuracy. In this paper, an intensity modulated light signal is combined with the light signal of an OEO in terms of wavelength division multiplexing (WDM) and is propagated through the fiber. The phase shift has been measured in real time to compensate for variations in fiber delay. With this method, experimental results showed a standard deviation of 14.8 µm.