Feature Extraction and Pattern Recognition for Human Motion by a Deep Sparse Autoencoder

For recognizing human motion intent, electromyogram (EMG) based pattern recognition approaches have been studied for many years. A number of methods for classifying EMG patterns have been introduced in the literature. On the purpose of selecting the best performing method for the practical application, this paper compares EMG pattern recognition methods in terms of motion type, feature extraction, dimension reduction, and classification algorithm. Also, for more usability of this research, hand and finger EMG motion data set which had been published online was used. Time-domain, empirical mode decomposition, discrete wavelet transform, and wavelet packet transform were adopted as the feature extraction. Three cases, such as no dimension reduction, principal component analysis (PCA), and linear discriminant analysis (LDA), were compared. Six classification algorithms were also compared: naïve Bayes, k-nearest neighbor, quadratic discriminant analysis, support vector machine, multi-layer perceptron, and extreme machine learning. The performance of each case was estimated by three perspectives: classification accuracy, train time, and test (prediction) time. From the experimental results, the time-domain feature set and LDA were required for the highest classification accuracy. Fast train time and test time are dependent on the classification methods.

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Method of Analyzing and Managing Volleyball Action by Using Action Sensor of Mobile Device

Journal of Sensors ◽

10.1155/2021/6232968 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Xu Sun ◽

Kai Zhao ◽

Wei Jiang ◽

Xinlong Jin

Keyword(s):

Pattern Recognition ◽

Support Vector Machine ◽

Feature Extraction ◽

Human Motion ◽

Classification Algorithm ◽

Support Vector ◽

Motion Sensors ◽

Support Vector Machine Algorithm ◽

Motion Information ◽

Motion Recognition

With the development of electronic technology and sensor technology, more and more intelligent electronic devices integrate micro inertial sensors, which makes the research of human action recognition based on action sensing data have great application value. Data-based action recognition is a new research direction in the field of pattern recognition, which is essentially a process of action data acquisition, feature extraction, feature extraction, and recognition, the process of classification and recognition. Inertial motion information includes acceleration and angular velocity information, which is ubiquitous in daily life. Compared with motion recognition based on visual information, it can more directly reflect the meaning of action. This study mainly discusses the method of analyzing and managing volleyball action by using the action sensor of mobile device. Based on the motion recognition algorithm of support vector machine, the motion recognition process of support vector machine is constructed. When the data terminal and gateway of volleyball players are not in the same LAN, the classification algorithm classifies the samples to be tested through the characteristic data, which directly affects the recognition results. In this paper, the support vector machine algorithm is selected as the data classification algorithm, and the calculation of the classification process is reduced by designing an appropriate kernel function. For multiclass problems, the hierarchical structure of directed acyclic graph is optimized to improve the recognition rate. We need to bind motion sensors to human joints. In order to realize real-time recognition of human motion, mobile devices need to add windows to the motion capture data, that is, divide the data into a small sequence of specified length, and provide more application scenarios for the device. This method of embedding motion sensors into devices to read motion information is widely used, which provides a convenient data acquisition method for human motion pattern recognition based on motion information. The multiclassification support vector machine algorithm is used to train the classification algorithm model with action data. When the signal strength of the sensor is 90 t and the speed is 2.0 m/s and 0.5 m/s, the detection accuracy of the adaptive threshold is 93% and 95%, respectively. The results show that the SVM method based on hybrid kernel function can greatly improve the recognition accuracy of volleyball stroke, and the recognition time is short.

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Human motion data analysis and retrieval based on 3D feature extraction

Journal of Computer Applications ◽

10.3724/sp.j.1087.2008.01344 ◽

2008 ◽

Vol 28 (5) ◽

pp. 1344-1346 ◽

Cited By ~ 1

Author(s):

Jian XIANG

Keyword(s):

Feature Extraction ◽

Data Analysis ◽

Human Motion ◽

Motion Data ◽

3D Feature Extraction

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Acceleration Feature Extraction of Human Body Based on Wearable Devices

Energies ◽

10.3390/en14040924 ◽

2021 ◽

Vol 14 (4) ◽

pp. 924

Author(s):

Zhenzhen Huang ◽

Qiang Niu ◽

Ilsun You ◽

Giovanni Pau

Keyword(s):

Genetic Algorithm ◽

Feature Extraction ◽

Kalman Filter ◽

Human Body ◽

Wearable Devices ◽

Human Motion ◽

Data Set ◽

Feature Extraction Method ◽

Motion Data ◽

Kalman Filter Algorithm

Wearable devices used for human body monitoring has broad applications in smart home, sports, security and other fields. Wearable devices provide an extremely convenient way to collect a large amount of human motion data. In this paper, the human body acceleration feature extraction method based on wearable devices is studied. Firstly, Butterworth filter is used to filter the data. Then, in order to ensure the extracted feature value more accurately, it is necessary to remove the abnormal data in the source. This paper combines Kalman filter algorithm with a genetic algorithm and use the genetic algorithm to code the parameters of the Kalman filter algorithm. We use Standard Deviation (SD), Interval of Peaks (IoP) and Difference between Adjacent Peaks and Troughs (DAPT) to analyze seven kinds of acceleration. At last, SisFall data set, which is a globally available data set for study and experiments, is used for experiments to verify the effectiveness of our method. Based on simulation results, we can conclude that our method can distinguish different activity clearly.

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Breath analysis based early gastric cancer classification from deep stacked sparse autoencoder neural network

Scientific Reports ◽

10.1038/s41598-021-83184-2 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Muhammad Aqeel Aslam ◽

Cuili Xue ◽

Yunsheng Chen ◽

Amin Zhang ◽

Manhua Liu ◽

...

Keyword(s):

Neural Network ◽

Gastric Cancer ◽

Feature Extraction ◽

Early Gastric Cancer ◽

Breath Analysis ◽

Cancer Classification ◽

Unlabeled Data ◽

Softmax Classifier ◽

Sparse Autoencoder ◽

Stacked Sparse Autoencoder

AbstractDeep learning is an emerging tool, which is regularly used for disease diagnosis in the medical field. A new research direction has been developed for the detection of early-stage gastric cancer. The computer-aided diagnosis (CAD) systems reduce the mortality rate due to their effectiveness. In this study, we proposed a new method for feature extraction using a stacked sparse autoencoder to extract the discriminative features from the unlabeled data of breath samples. A Softmax classifier was then integrated to the proposed method of feature extraction, to classify gastric cancer from the breath samples. Precisely, we identified fifty peaks in each spectrum to distinguish the EGC, AGC, and healthy persons. This CAD system reduces the distance between the input and output by learning the features and preserve the structure of the input data set of breath samples. The features were extracted from the unlabeled data of the breath samples. After the completion of unsupervised training, autoencoders with Softmax classifier were cascaded to develop a deep stacked sparse autoencoder neural network. In last, fine-tuning of the developed neural network was carried out with labeled training data to make the model more reliable and repeatable. The proposed deep stacked sparse autoencoder neural network architecture exhibits excellent results, with an overall accuracy of 98.7% for advanced gastric cancer classification and 97.3% for early gastric cancer detection using breath analysis. Moreover, the developed model produces an excellent result for recall, precision, and f score value, making it suitable for clinical application.

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Instrumental Odour Monitoring System Classification Performance Optimization by Analysis of Different Pattern-Recognition and Feature Extraction Techniques

Sensors ◽

10.3390/s21010114 ◽

2020 ◽

Vol 21 (1) ◽

pp. 114

Author(s):

Tiziano Zarra ◽

Mark Gino K. Galang ◽

Florencio C. Ballesteros ◽

Vincenzo Belgiorno ◽

Vincenzo Naddeo

Keyword(s):

Pattern Recognition ◽

Feature Extraction ◽

Performance Optimization ◽

Industrial Plant ◽

Mathematical Treatment ◽

Extraction Techniques ◽

Peak Period ◽

Linear Discriminant ◽

Artificial Neural

Instrumental odour monitoring systems (IOMS) are intelligent electronic sensing tools for which the primary application is the generation of odour metrics that are indicators of odour as perceived by human observers. The quality of the odour sensor signal, the mathematical treatment of the acquired data, and the validation of the correlation of the odour metric are key topics to control in order to ensure a robust and reliable measurement. The research presents and discusses the use of different pattern recognition and feature extraction techniques in the elaboration and effectiveness of the odour classification monitoring model (OCMM). The effect of the rise, intermediate, and peak period from the original response curve, in collaboration with Linear Discriminant Analysis (LDA) and Artificial Neural Networks (ANN) as a pattern recognition algorithm, were investigated. Laboratory analyses were performed with real odour samples collected in a complex industrial plant, using an advanced smart IOMS. The results demonstrate the influence of the choice of method on the quality of the OCMM produced. The peak period in combination with the Artificial Neural Network (ANN) highlighted the best combination on the basis of high classification rates. The paper provides information to develop a solution to optimize the performance of IOMS.

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RPCA-Based High Resolution Through-the-Wall Human Motion Feature Extraction and Classification

IEEE Sensors Journal ◽

10.1109/jsen.2021.3088122 ◽

2021 ◽

pp. 1-1

Author(s):

Qiang An ◽

Shuoguang Wang ◽

Lei Yao ◽

Wenji Zhang ◽

Hao Lv ◽

...

Keyword(s):

Feature Extraction ◽

High Resolution ◽

Human Motion ◽

Motion Feature

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Research on Modulation Recognition Algorithm of Digital Communication Signal Based on Wavelet Denoising

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.608-609.459 ◽

2014 ◽

Vol 608-609 ◽

pp. 459-467 ◽

Cited By ~ 1

Author(s):

Xiao Yu Gu

Keyword(s):

Pattern Recognition ◽

Feature Extraction ◽

Decision Theory ◽

Recognition Rate ◽

Recognition Algorithm ◽

Modulation Recognition ◽

The Core ◽

Feature Parameters ◽

Communication Signal ◽

Modulation Signal

The paper researches a recognition algorithm of modulation signal and modulation modes. The modulation modes to be recognized include 2ASK, 2FSK, 2PSK, 4ASK, 4FSK and 4PSK modulation. There are two methods recognizing modulation modes of digital signal, method based on decision theory and pattern-recognition method based on feature extraction. The method based on decision theory is not suitable for recognition with multiple modulation modes. The core of pattern recognition based on feature extraction is selection of feature parameters. So the paper uses the feature parameters with simple calculation, easy to be implemented and high recognition rate as the core. The extraction of feature parameters is based on instant feature of modulation signal after Hilbert transformation.

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