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Proceedings ArticleDOI

Bengali handwritten character recognition using deep convolutional neural network

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TLDR
A convolutional deep model to recognize Bengali handwritten characters is proposed that first learnt a useful set of features by using kernels and local receptive fields, and then it has employed densely connected layers for the discrimination task.
Abstract
Handwritten character recognition is a nontrivial task as it seeks to recognize the correct class for user independent handwritten characters. This problem becomes even more challenging for a highly stylized, morphologically complex, and potentially juxtapositional characters comprising language like Bengali. As a result, the improvements over the years in Bengali character recognition are significantly less as compared to the other languages. In this paper, we propose a convolutional deep model to recognize Bengali handwritten characters. We first learnt a useful set of features by using kernels and local receptive fields, and then we have employed densely connected layers for the discrimination task. Our system has been tested on BanglaLekha-Isolated dataset. It achieves 98.66% accuracy on numerals (10 character classes), 94.99% accuracy on vowels (11 character classes), 91.60% accuracy on compound letters (20 character classes), 91.23% accuracy on alphabets (50 character classes), and 89.93% accuracy on almost all Bengali characters (80 character classes). Most of the errors incurred by our model in recognition task are due to extreme proximity in shapes among characters. A significant number of errors was caused by the mislabeled, irrecoverably distorted, and illegal data examples.

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Citations
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Proceedings ArticleDOI

Bangla Handwritten Character Recognition using Convolutional Neural Network with Data Augmentation

TL;DR: A process of Handwritten Character Recognition to recognize and convert images of individual Bangla handwritten characters into electronically editable format is proposed, which will create opportunities for further research and can also have various practical applications.
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DeepNetDevanagari: a deep learning model for Devanagari ancient character recognition

TL;DR: The authors have proposed to use deep learning model as a feature extractor as well as a classifier for the recognition of 33 classes of basic characters of Devanagari ancient manuscripts and the accuracy achieved is better than other state-of-the-art techniques.
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Devanagari Handwritten Character Recognition using fine-tuned Deep Convolutional Neural Network on trivial dataset

TL;DR: A two-stage approach of deep learning is developed to enhance overall success of the proposed Devanagari Handwritten Character Recognition System (DHCRS), which requires very fewer trainable parameters and notably less training time to achieve state-of-the-art performance on a very small dataset.
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Ancient text recognition: a review

TL;DR: A comprehensive survey of the work done in the various phases of an OCR with special focus on the OCR for ancient text documents is presented and future directions for the upcoming researchers in the field of ancient text recognition are presented.
References
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Proceedings Article

ImageNet Classification with Deep Convolutional Neural Networks

TL;DR: The state-of-the-art performance of CNNs was achieved by Deep Convolutional Neural Networks (DCNNs) as discussed by the authors, which consists of five convolutional layers, some of which are followed by max-pooling layers, and three fully-connected layers with a final 1000-way softmax.
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Feature extraction methods for character recognition--a survey

TL;DR: This paper presents an overview of feature extraction methods for off-line recognition of segmented (isolated) characters in terms of invariance properties, reconstructability and expected distortions and variability of the characters.
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A novel hybrid CNN-SVM classifier for recognizing handwritten digits

TL;DR: A hybrid model of integrating the synergy of two superior classifiers: Convolutional Neural Network (CNN) and Support Vector Machine (SVM) which have proven results in recognizing different types of patterns is presented.
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A trainable feature extractor for handwritten digit recognition

TL;DR: A trainable feature extractor based on the LeNet5 convolutional neural network architecture is introduced to solve the first problem in a black box scheme without prior knowledge on the data and the results show that the system can outperform both SVMs and Le net5 while providing performances comparable to the best performance on this database.
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Fast k-nearest neighbor classification using cluster-based trees

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