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IEEE INDICON 2004 - 1st India Annual Conference

作者： Chattopadhyay, Tanushyam Chaudhuri, B.B. Systems TCS Kolkata Computer Vision and Pattern Recognition Unit Indian Statistical Institute Jawaharlal Nehru

ISBN: (纸本)0780389093

One of the major challenges in speech synthesis and recognition is co-articulated unit segmentation. In this paper we present a novel technique for segmenting the basic co-articulated units using multifactorial analysis based approach. The proposed algorithm is applied on isolated spoken words in Bangla. The results obtained from a considerably large database show the strength of the approach. ©2004 IEEE.

关键词： Speech synthesis

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Distance Metric Learned Collaborative Representation Classifier(DML-CRC)

IEEE Letters of the Computer Society

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IEEE Letters of the computer Society 2020年第2期3卷 34-37页

作者： Chakraborti, Tapabrata McCane, Brendan Mills, Steven Pal, Umapada Department of Computer Science University of Otago Dunedin9016 New Zealand Computer Vision and Pattern Recognition Unit Indian Statistical Institute Kolkata700108 India

Any generic deep machine learning algorithm is essentially a function fitting exercise, where the network tunes its weights and parameters to learn discriminatory features by minimizing some cost function. Though the network tries to learn the optimal feature space, it seldom tries to learn an optimal distance metric in the cost function, and hence misses out on an additional layer of abstraction. We present a simple effective way of achieving this by learning a generic Mahalanabis distance in a collaborative loss function in an end-to-end fashion with any standard convolutional network as the feature learner. The proposed method DML-CRC gives state-of-the-art performance on benchmark fine-grained classification datasets CUB Birds, Oxford Flowers and Oxford-IIIT Pets using the VGG-19 deep network. The method is network agnostic and can be used for other similar classification tasks. © 2018 IEEE.

关键词： Learning algorithms

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Self-Supervised Representation Learning for Knee Injury Diagnosis From Magnetic Resonance Data

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2024年第4期5卷 1613-1623页

作者： Manna, Siladittya Bhattacharya, Saumik Pal, Umapada Indian Statistical Institute Computer Vision and Pattern Recognition Unit Kolkata700108 India Indian Institute of Technology Kharagpur Department of Electronics and Electrical Communication Engineering Kharagpur721302 India

In medical image analysis, the cost of acquiring high-quality data and annotation by experts is a barrier in many medical applications. Most of the techniques used are based on a supervised learning framework and require a large amount of annotated data to achieve satisfactory performance. As an alternative, in this article, we propose a self-supervised learning approach for learning the spatial anatomical representations from the frames of magnetic resonance (MR) video clips for the diagnosis of knee medical conditions. The pretext model learns meaningful context-invariant spatial representations. The downstream task in our article is a class-imbalanced multilabel classification. Different experiments show that the features learned by the pretext model provide competitive performance in the downstream task. Moreover, the efficiency and reliability of the proposed pretext model in learning representations of minority classes without applying any strategy toward imbalance in the dataset can be seen from the results. To the best of our knowledge, this work is the first of its kind in showing the effectiveness and reliability of self-supervised learning algorithms in imbalanced multilabel classification tasks on MR scans. © 2020 IEEE.

关键词： Supervised learning

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A corpus for OCR research on mathematical expressions

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International Journal on Document Analysis and recognition 2005年第4期7卷 241-259页

作者： Garain, Utpal Chaudhuri, B.B. Computer Vision and Pattern Recognition Unit Indian Statistical Institute Calcutta-700 035 203 B.T. Road India

This paper is concerned with research on OCR (optical character recognition) of printed mathematical expressions. Construction of a representative corpus of technical and scientific documents containing expressions is discussed. A statistical investigation of the corpus is presented, and usefulness of this analysis is demonstrated in the related research problems, namely, (i) identification and segmentation of expression zones from the rest of the document, (ii) recognition of expression symbols, (iii) interpretation of expression structures, and (iv) performance evaluation of a mathematical expression recognition system. Moreover, a groundtruthing format has been proposed to facilitate automatic evaluation of expression recognition techniques. © Springer-Verlag Berlin/Heidelberg 2005.

关键词： Database Groundtruthing Mathematical expressions OCR Performance evaluation Statistical learning

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Preliminary level cardiac abnormality detection using wireless telecardiology system 1

Preliminary level cardiac abnormality detection using wirele...

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1st International Conference on the Digital Society, ICDS 2007

作者： Mitra, M. Mitra, S. Bera, J.N. Gupta, R. Chaudhuri, B.B. Dept. of Applied Physics University of Calcutta India Computer Vision and Pattern Recognition Unit ISI Kolkata India

ISBN: (纸本)0769527604

This paper describes a portable diagnostic telecardiology system, aimed to benefit the rural people of a third world country like India. The designed system consists of two major blocks;the first one is required to be carried to the patient home, named ¿Portable Telecardiology Kit¿. The second one, named ¿Automated Cardiac Signal Processor¿, a PC based system, to be permanently placed at the nearest rural health care center. The ¿Portable Telecardiology Kit¿ contains a portable ECG machine, a dedicated microcontroller-based full duplex communication system, both interfaced, in a single enclosure. This kit will convert the ECG signal along with a tag page (containing different information regarding patient¿s health and history of illness) to a digitized serial electromagnetic wave. The signal may be transmitted over a distance of about 7-10 km through a cordless phone under full duplex mode. The PC-based system, after receiving the transmitted signal from patient site, extract the ECG signal after proper filtering, and then pass the signal through an in-built knowledge-base. Finally, a rule-based rough set decision system is generated for the development of an inference engine for disease identification from these time-plane features. The system will generate a report indicating the preliminary level abnormalities, and the precautions that can be adopted at an early stage. The entire report is then sent to the Portable kit at the patient bed-site. © 2007 IEEE.

关键词： Electrocardiograms

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ClueNet: A deep framework for occluded pedestrian pose estimation 30

ClueNet: A deep framework for occluded pedestrian pose estim...

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30th British Machine vision Conference, BMVC 2019

作者： Kishore, Perla Sai Raj Das, Sudip Mukherjee, Partha Sarathi Bhattacharya, Ujjwal Institute of Engineering and Management Kolkata India Indian Statistical Institute Computer Vision and Pattern Recognition Unit Kolkata India

Pose estimation of a pedestrian helps to gather information about the current activity or the instant behaviour of the subject. Such information is useful for autonomous vehicles, augmented reality, video surveillance, etc. Although a large volume of pedestrian detection studies are available in the literature, detection of the same in situations of significant occlusions still remains a challenging task. In this work, we take a step further to propose a novel deep learning framework, called ClueNet, to detect as well as estimate the entire pose of occluded pedestrians in an unsupervised manner. ClueNet is a two stage framework where the first stage generates visual clues for the second stage to accurately estimate the pose of occluded pedestrians. The first stage employs a multi-task network to segment the visible parts and predict a bounding box enclosing the visible and occluded regions for each pedestrian. The second stage uses these predictions from the first stage for pose estimation. Here we propose a novel strategy, called Mask and Predict, to train our ClueNet to estimate the pose even for occluded regions. Additionally, we make use of various other training strategies to further improve our results. The proposed work is first of its kind and the experimental results on CityPersons and MS COCO datasets show the superior performance of our approach over existing methods. © 2019. The copyright of this document resides with its authors.

关键词： Augmented reality

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Air Writing: Recognizing Multi-Digit Numeral String Traced in Air Using RNN-LSTM Architecture

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SN computer Science 2021年第1期2卷 1-13页

作者： Rahman, Adil Roy, Prasun Pal, Umapada Department of Information Technology Heritage Institute of Technology Kolkata India Computer Vision and Pattern Recognition Unit Indian Statistical Institute Kolkata India

Air writing provides a more natural and immersive way of interacting with devices, with the potential of having significant application in fields like augmented reality and education. However, such systems often rely on expensive hardware, making them less accessible for general purposes. In this study, we propose a robust and inexpensive system for the recognition of multi-digit numerals traced in an air-writing environment which uses only a generic device camera for input. We employ a sliding window-based algorithm to isolate a small segment of the input for processing. A dual network configuration consisting of RNN-LSTM networks are used for noise elimination and digit recognition. We conduct our experiments on English numerals using the MNIST dataset as the baseline model to allow easy adaptability of our method. Our results are further improved by the use of Pendigits and ISI-Air online datasets. We observed a drop in accuracy with increase in the number of digits owing to the accumulation of transition noise. However, bi-directional scanning considerably reduces the impact of such noise on the recognition accuracy. Under standard conditions, our system produced an accuracy of 98.75% and 85.27% for single and multi-digit English numerals, respectively. Incorporation of selective frame skipping in the sliding window algorithm resulted in a 60% reduction in computational time, significantly improving the system performance. We provide a link to the source code of our system at the end of this paper. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Air writing Handwritten character recognition Human–computer interaction Long short-term memory Recurrent neural network

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Multi-label learning on principles of reverse k-nearest neighbourhood

Multi-label learning on principles of reverse k-nearest neig...

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作者： Sadhukhan, Payel Palit, Sarbani Machine Intelligence Unit Indian Statistical Institute Kolkata India Computer Vision and Pattern Recognition Unit Indian Statistical Institute Kolkata India

In this article, we present a novel neighbourhood based multi-label classifier, Multi-label Learning on principles of Reverse k-Nearest Neighbourhood (ML-RkNN) where we estimate the neighbourhood of the points on the basis of their reverse k-nearest neighbourhood (RkNN). Through RkNN, for the same value of k, we get different number of neighbours for different instances and this happens adaptively according to the neighbourhood configuration of the points. The automatically adaptive neighbourhood helps us in better learning of the local configurations around the points. Our scheme also facilitates implicit handling of the local imbalances prevailing in the datasets by comparing the class distributions of the test points and their reverse nearest neighbours. This implicit and adaptive handling is particularly useful for multi-label label datasets, whose labels are differentially imbalanced. Empirical study is performed on 10 real-world multi-label datasets considering five neighbourhood based multi-label learners. Macro F1 is used as the evaluating metric. The proposed method has given statistically superior and statistically comparable performances with respect to three and two comparing methods respectively. Additionally, we have explored the use of two different distance metrics, Euclidean and Jaccard in our scheme for nominal datasets. © 2020 John Wiley & Sons, Ltd.

关键词： Classification (of information)

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Off-line handwritten Thai name recognition for student identification in an automated assessment system

Off-line handwritten Thai name recognition for student ident...

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2014 International Joint Conference on Neural Networks, IJCNN 2014

作者： Suwanwiwat, Hemmaphan Nguyen, Vu Blumenstein, Michael Pal, Umapada School of Information and Communication Technology Griffith University Australia Computer Vision and Pattern Recognition Unit Indian Statistical Institute India

ISBN: (纸本)9781479914845

In the field of pattern recognition, off-line handwriting recognition is one of the most intensive areas of study. This paper proposes an automatic off-line Thai language student name identification system which was built as a part of a completed off-line automated assessment system. There is limited work undertaken in developing off-line automatic assessment systems using handwriting recognition. To the authors' knowledge, none of the work on the proposed system has been performed on the Thai language. In addition the proposed system recognises each Thai name by using an approach for whole word recognition, which is different from the work found in the literature as most perform character-based recognition. In this proposed system, the Gaussian Grid Feature (GGF) and the Modified Direction Feature (MDF) extraction techniques are investigated on upper and lower contours, loops from full word contour images of each name sample, and artificial neural networks and support vector machine are used as classifiers. The encouraging recognition rates for both feature extraction techniques were achieved when applied on loop, upper and lower contour images (99.27% accuracy rate was achieved using MDF on artificial neural networks and 99.27% using GGF with a support vector machine classifier). © 2014 IEEE.

关键词： Students

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On machine understanding of online handwritten mathematical expressions 7

On machine understanding of online handwritten mathematical ...

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7th International Conference on Document Analysis and recognition, ICDAR 2003

作者： Garain, Utpal Chaudhuri, B.B. Computer Vision and Pattern Recognition Unit Indian Statistical Institute 203 B. T. Road Kolkata India

ISBN: (纸本)0769519601

This paper aims at automatic recognition of online handwritten mathematical expressions written on an electronic tablet. The proposed technique involves two major stages: symbol recognition and structural analysis. A multiple-classifier consists of both parametric and nonparametric classifier has been used for recognition of symbols. Parametric classifier is based on Hidden Markov Model (HMM), whereas, non-parametric classifier uses Nearest Neighbor classification scheme. Structural analysis uses several online and offline features to identify the spatial relationships among symbols. A context free grammar has been designed to convert input expressions into their corresponding Latex strings. Contextual information has been used to correct several errors occurring at both recognition and structural analysis stage. A new method for evaluating performance of the proposed systems has been formulated. Experiments on a dataset of considerable size show high efficiency of the proposed system. © 2003 IEEE.

关键词： Structural analysis

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