Action recognition in depth video from RGB perspective: A knowledge transfer manner

2018 ◽  
Author(s):  
Yang Xiao ◽  
Zhiguo Cao ◽  
jun chen ◽  
zhiwen fang
Keyword(s):  
Knowledge Transfer ◽  
Action Recognition ◽  
Depth Video

Cross-view action recognition via view knowledge transfer

CVPR 2011 ◽  
2011 ◽  
Author(s):  
Jingen Liu ◽  
Mubarak Shah ◽  
Benjamin Kuipers ◽  
Silvio Savarese
Keyword(s):  
Knowledge Transfer ◽  
Action Recognition

scholarly journals Hierarchical dynamic depth projected difference images–based action recognition in videos with convolutional neural networks

2019 ◽  
Vol 16 (1) ◽  
pp. 172988141882509 ◽  
Author(s):  
Hanbo Wu ◽  
Xin Ma ◽  
Yibin Li
Keyword(s):  
Neural Networks ◽  
Convolutional Neural Networks ◽  
Action Recognition ◽  
Human Action Recognition ◽  
Human Action ◽  
Temporal Information ◽  
Superior Performance ◽  
Video Sequences ◽  
Depth Video ◽  
Difference Images

Temporal information plays a significant role in video-based human action recognition. How to effectively extract the spatial–temporal characteristics of actions in videos has always been a challenging problem. Most existing methods acquire spatial and temporal cues in videos individually. In this article, we propose a new effective representation for depth video sequences, called hierarchical dynamic depth projected difference images that can aggregate the action spatial and temporal information simultaneously at different temporal scales. We firstly project depth video sequences onto three orthogonal Cartesian views to capture the 3D shape and motion information of human actions. Hierarchical dynamic depth projected difference images are constructed with the rank pooling in each projected view to hierarchically encode the spatial–temporal motion dynamics in depth videos. Convolutional neural networks can automatically learn discriminative features from images and have been extended to video classification because of their superior performance. To verify the effectiveness of hierarchical dynamic depth projected difference images representation, we construct a hierarchical dynamic depth projected difference images–based action recognition framework where hierarchical dynamic depth projected difference images in three views are fed into three identical pretrained convolutional neural networks independently for finely retuning. We design three classification schemes in the framework and different schemes utilize different convolutional neural network layers to compare their effects on action recognition. Three views are combined to describe the actions more comprehensively in each classification scheme. The proposed framework is evaluated on three challenging public human action data sets. Experiments indicate that our method has better performance and can provide discriminative spatial–temporal information for human action recognition in depth videos.

A Flexible High-Level Fusion for an Accurate Human Action Recognition System

2020 ◽  
Vol 29 (12) ◽  
pp. 2050190
Author(s):  
Amel Ben Mahjoub ◽  
Mohamed Atri
Keyword(s):  
Action Recognition ◽  
Short Term Memory ◽  
Recognition Rate ◽  
Human Action Recognition ◽  
Local Binary Patterns ◽  
Low Complexity ◽  
Recognition System ◽  
Human Action ◽  
Collaborative Representation ◽  
Depth Video

Action recognition is a very effective method of computer vision areas. In the last few years, there has been a growing interest in Deep learning networks as the Long Short–Term Memory (LSTM) architectures due to their efficiency in long-term time sequence processing. In the light of these recent events in deep neural networks, there is now considerable concern about the development of an accurate action recognition approach with low complexity. This paper aims to introduce a method for learning depth activity videos based on the LSTM and the classification fusion. The first step consists in extracting compact depth video features. We start with the calculation of Depth Motion Maps (DMM) from each sequence. Then we encode and concatenate contour and texture DMM characteristics using the histogram-of-oriented-gradient and local-binary-patterns descriptors. The second step is the depth video classification based on the naive Bayes fusion approach. Training three classifiers, which are the collaborative representation classifier, the kernel-based extreme learning machine and the LSTM, is done separately to get classification scores. Finally, we fuse the classification score outputs of all classifiers with the naive Bayesian method to get a final predicted label. Our proposed method achieves a significant improvement in the recognition rate compared to previous work that has used Kinect v2 and UTD-MHAD human action datasets.

Multi-View Hierarchical Bidirectional Recurrent Neural Network for Depth Video Sequence Based Action Recognition

2018 ◽  
Vol 32 (10) ◽  
pp. 1850033 ◽  
Author(s):  
Xueping Liu ◽  
Yibo Li ◽  
Qingjun Wang
Keyword(s):  
Action Recognition ◽  
Video Sequence ◽  
Single Layer ◽  
Human Action Recognition ◽  
Research Direction ◽  
Human Action ◽  
Depth Image ◽  
Classification Framework ◽  
Depth Video ◽  
High Computational Efficiency

Human action recognition based on depth video sequence is an important research direction in the field of computer vision. The present study proposed a classification framework based on hierarchical multi-view to resolve depth video sequence-based action recognition. Herein, considering the distinguishing feature of 3D human action space, we project the 3D human action image to three coordinate planes, so that the 3D depth image is converted to three 2D images, and then feed them to three subnets, respectively. With the increase of the number of layers, the representations of subnets are hierarchically fused to be the inputs of next layers. The final representations of the depth video sequence are fed into a single layer perceptron, and the final result is decided by the time accumulated through the output of the perceptron. We compare with other methods on two publicly available datasets, and we also verify the proposed method through the human action database acquired by our Kinect system. Our experimental results demonstrate that our model has high computational efficiency and achieves the performance of state-of-the-art method.

scholarly journals Action recognition for depth video using multi-view dynamic images

2019 ◽  
Vol 480 ◽  
pp. 287-304 ◽  
Author(s):  
Yang Xiao ◽  
Jun Chen ◽  
Yancheng Wang ◽  
Zhiguo Cao ◽  
Joey Tianyi Zhou ◽  
...  
Keyword(s):  
Action Recognition ◽  
Depth Video

Action recognition by fusing depth video and skeletal data information

2018 ◽  
Vol 78 (2) ◽  
pp. 1971-1998 ◽  
Author(s):  
Ioannis Kapsouras ◽  
Nikos Nikolaidis
Keyword(s):  
Action Recognition ◽  
Depth Video
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