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公开(公告)号：US12235225B2
公开(公告)日：2025-02-25
申请号：US18185476
申请日：2023-03-17
Applicant: Tata Consultancy Services Limited
Inventor： Arijit Chowdhury , Anwesha Khasnobish , Smriti Rani , Achanna Anil Kumar , Soumya Chakravarty , Arpan Pal , Tapas Chakravarty
IPC: G01N22/02 , G01S7/41 , G01S13/532 , G01S13/90
Abstract: This disclosure relates generally to material quality inspection. Conventional approaches available for material quality inspection are unable to address concerns of complexity and cost involved. The technical problem of occluded object detection and material quality inspection for intrinsic defects identification is addressed in the present disclosure. The present disclosure provides a system and method for non-intrusive material quality inspection using three-dimensional monostatic radar based imaging, where the object under inspection undergoes a circular translation motion on a rotating platform. A modified delay-and-sum (m-DAS) algorithm is built by incorporating virtual antenna array to obtain a 3D image reconstruction of the object. From 3D reconstructed images, radial displacement as well as the angular locations of the object is identified which are further used for quality inspection of the material comprised in the object.
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公开(公告)号：US11699522B2
公开(公告)日：2023-07-11
申请号：US16396276
申请日：2019-04-26
Applicant: Tata Consultancy Services Limited
Inventor： Avik Ghose , Arijit Chowdhury , Sakyajit Bhattacharya , Vivek Chandel , Arpan Pal , Soma Bandyopadhyay
IPC: G06N5/02 , G06N5/04 , G06K9/62 , G06F16/9035 , A61B5/00 , G16H40/67 , G06F16/908 , G06N5/022 , G06F18/25
CPC classification number: G16H40/67 , A61B5/7275 , G06F16/908 , G06F16/9035 , G06F18/251 , G06N5/022 , G06N5/04
Abstract: This disclosure relates generally to a unified platform for domain adaptable human behaviour inference. The platform provides a unified, low level inference and high level inference of domain adaptable human behaviour inference. The low level inferences include cross-sectional analysis techniques to infer location, activity, physiology. Further the high inference that provide useful and actionable for longitudinal tracking, prediction and anomaly detection is performed based on several longitudinal analysis techniques that include welch analysis, cross-spectrum analysis, Feature of interest (FOI) identification and time-series clustering, autocorrelation-based distance estimation and exponential smoothing, seasonal and non-seasonal models identification, ARIMA modelling, Hidden Markov models, Long short term memory (LSTM) along with low level inference, human meta-data and application domain knowledge. Further the unified human behaviour inference can be obtained across multiple domains that include health, retail and transportation.
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公开(公告)号：US11298084B2
公开(公告)日：2022-04-12
申请号：US15900774
申请日：2018-02-20
Applicant: Tata Consultancy Services Limited
Inventor： Shreyasi Datta , Anirban Dutta Choudhury , Arijit Chowdhury , Rohan Banerjee , Tanushree Banerjee , Arpan Pal , Kayapanda Mandana
Abstract: A system and method for estimating blood pressure (BP) using photoplethysmogram (PPG) has been explained. The PPG is captured from a PPG sensor (102). For preparing training model, a pulse oximeter is used for capturing PPG. For testing, a smartphone camera is used for capturing the PPG signal. A plurality of features are extracted from the preprocessed PPG signal. A BP distribution is then generated using the plurality of features and the training model. The BP distribution is part of a set of BP distributions generated from different subjects. Finally, a post-processing methodology have been used to reject inconsistent data out of the set of BP distributions and BP value is estimated only for the remaining BP distributions and a statistical average is provided as the blood pressure estimate.
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公开(公告)号：US20210148718A1
公开(公告)日：2021-05-20
申请号：US17029199
申请日：2020-09-23
Applicant: Tata Consultancy Services Limited
Inventor： Varsha SHARMA , Arijit Chowdhury
Abstract: Reckless behavior of drivers like, speeding, sudden acceleration and swerving through lanes can cause fatality and financial loss. Conventional methods mainly focus on driving style classification. The conventional methods mainly focus on driver classification and are not able to provide trip classification of a driver. Hence there is a challenge in trip classification of the driver based on acceleration data. The present disclosure for trip classification addresses the problem of end to end trip classification based on the acceleration data. Here, a journey is segmented into a plurality of sub-journey segments and each sub-journey segment is associated with a plurality of driving events. An event score is calculated for each sub-journey and a normalization is performed on the event score. Further, the journey is classified into at least one of good, average or bad based on the normalized data by utilizing a fuzzy based classification.
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公开(公告)号：US11915524B2
公开(公告)日：2024-02-27
申请号：US17044299
申请日：2019-02-18
Applicant: Tata Consultancy Services Limited
Inventor： Dibyendu Roy , Arijit Chowdhury , Arijit Sinharay , Avik Ghose
CPC classification number: G06V40/28 , G06F21/316 , G06F21/32
Abstract: This disclosure relates generally to a method and system for online handwritten signature verification providing a simpler low cost system. The method comprises extracting signature data for the subject from a sensor array for the predefined time window at regular predefined time instants. Further, differentiating the matrix row wise and column wise to generate a row difference matrix and a column difference matrix. Further, determining an idle signature time fraction for the extracted signature data of the subject being monitored from the column difference matrix. Further, determining a plurality of signature parameters based on the row difference matrix and the column difference matrix. Further, analyzing the idle signature time fraction and the plurality of signature parameters of the subject being monitored based on a Support Vector Machine (SVM) classifier, wherein the SVM classifier performs online classification of the extracted signature data into one of a matching signature class and a non-matching signature class.
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Patent Agency Ranking
公开(公告)号：US10969482B2
公开(公告)日：2021-04-06
申请号：US16254190
申请日：2019-01-22
Applicant: Tata Consultancy Services Limited
Inventor： Arijit Chowdhury , Raj Rakshit , Tapas Chakravarty
IPC: G01S13/86 , G01S13/56 , G08B21/04 , G01S15/58 , G01S17/58 , G01S15/42 , G01S15/66 , G01S13/58 , G01S15/87 , G01S3/80
Abstract: The present disclosure provides means for detecting and tracking a moving object using RADAR and ultrasonic sensors. A stationary RADAR detects the moving object and estimates speed and two rotating ultrasonic sensors determine distance of the detected object. An incrementally changing orientation of the ultrasound sensors is associated with an angular speed of rotation based on a last logged distance of the moving object from the ultrasound sensors. Once the moving object is detected, based on an adaptively changing sampling frequency, the moving object is continuously tracked in real time. Conventionally, multiple RADARs are needed for location estimation and motion tracking. Also, merely using a RADAR in combination with an ultrasound sensor also does not serve the purpose since both sensors are static. The present disclosure provides a simple cost effective alternative that can find application in say tracking of an elderly person living alone in an unobtrusive manner.
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公开(公告)号：US10960893B2
公开(公告)日：2021-03-30
申请号：US15878857
申请日：2018-01-24
Applicant: Tata Consultancy Services Limited
Inventor： Arijit Chowdhury , Avik Ghose , Tapas Chakravarty
Abstract: This disclosure relates generally to driver profiling, and more particularly to system and method for driver profiling corresponding to automobile trip. In one embodiment, the method includes selectively computing, based on GPS data captured during a trip, features such that a first set of features are computed at a computation device and a second set of features are computed at a cloud server. The first and second set of features differs in computational complexity level. Said features include statistical data for attributes computed from the GPS data. The features corresponding to the trip are stored at repository associated with the cloud server. The repository includes previously precomputed features data associated with a set of driver profiles for previously completed trips. A driver profile corresponding to the trip is identified from amongst the set of driver profiles based on comparison of the plurality of features and the previously computed features data.
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公开(公告)号：US10338089B2
公开(公告)日：2019-07-02
申请号：US14751749
申请日：2015-06-26
Applicant: Tata Consultancy Services Limited
Inventor： Tapas Chakravarty , Arijit Chowdhury , Balamuralidhar Purushothaman
Abstract: A method and system for determining a speed of a vehicle based on a GPS speed captured from a Global Positioning System (GPS). A capturing module captures GPS speed Vx and a horizontal accuracy value corresponding to a time stamp Tx. A speed modification module modifies the GPS speed Vx corresponding to the time stamp Tx. A speed correcting module corrects the GPS speed Vx corresponding to the time stamp Tx. The GPS speed may be corrected by filtering an error in the GPS speed by using a Slope dependent averaging (SDA) filter in order to obtain a first corrected speed Vx′. Further, the first corrected speed is corrected by selecting one of a center weight (CW) filter and an edge weight (EW) filter, based upon a pre-defined condition, in order to obtain a second corrected speed Vx″ indicating the speed of the vehicle.
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公开(公告)号：US09248837B2
公开(公告)日：2016-02-02
申请号：US14619462
申请日：2015-02-11
Applicant: Tata Consultancy Services Limited
Inventor： Tapas Chakravarty , Arijit Chowdhury , Balamuralidhar Purushothaman
CPC classification number: B60W30/143 , B60W30/20 , B60W2520/105 , B60W2550/147 , B60W2550/402 , B60W2720/10
Abstract: A method and system for controlling a speed of a vehicle. Acceleration data comprising acceleration samples of the vehicle on a segment of the road is captured. Jerk energy values associated with the vehicle on the segment is computed based upon the acceleration samples. Median jerk energy of the vehicle on the segment may be determined based upon the jerk energy values. Predictive median jerk energy of the vehicle on the segment is computed using a statistical equation. A score associated with the segment is calculated based upon the median jerk energy, the predictive median jerk energy, and a standard deviation (σ). The segment is classified into one of a first set of categories and a second set of categories based upon the score. A feedback signal indicative of controlling the speed of the vehicle is transmitted to a controller based upon the classification.
Abstract translation: 一种用于控制车辆速度的方法和系统。 捕获包括在道路的段上的车辆的加速度样本的加速度数据。 基于加速度采样计算与车辆在段上相关联的冲击能量值。 可以基于加加斯能量值来确定车辆在该段上的中位冲击能量。 使用统计方程计算车辆在段上的预测中值加加斯能量。 根据中值加加斯能量，预测中值加加斯能量和标准偏差（＆sgr）计算与分段相关的分数。 该分段根据分数被分类为第一组类别和第二组类别之一。 基于分类，将指示控制车辆速度的反馈信号发送到控制器。
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公开(公告)号：US11490824B2
公开(公告)日：2022-11-08
申请号：US17013274
申请日：2020-09-04
Applicant: Tata Consultancy Services Limited
Inventor： Shalini Mukhopadhyay , Nasimuddin Ahmed , Arijit Chowdhury , Varsha Sharma , Avik Ghose
Abstract: While performing heart rate estimation of a user, if the user is in motion, a signal is measured and is likely to have noise data, which in turn affects accuracy of estimated heart rate value. Method and system for heart rate estimation when the user is in motion is disclosed. The system estimates value of a noise signal present in a measured PPG signal by performing a Principal Component Analysis (PCA) of an accelerometer signal collected along with the PPG signal. The system further estimates value of a true cardiac signal for a time window, based on value of the true cardiac signal in a pre-defined number of previous time windows. The system then estimates frequency spectrum of a clean PPG signal based on the estimated noise signal and the true cardiac signal. The system further performs heart rate estimation based on the clean PPG signal.
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