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Arabian Journal for Science and Engineering

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18.03.2022 | Research Article-Computer Engineering and Computer Science

UnCNN: A New Directed CNN Model for Isolated Arabic Handwritten Characters Recognition

verfasst von: Mohsine Elkhayati, Youssfi Elkettani

Erschienen in: Arabian Journal for Science and Engineering | Ausgabe 8/2022

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Abstract

Deeper and wider Convolutional Neural Networks (CNN) have achieved peak performance in many applications. However, the greater the depth/width of the network, the more complexity increases resulting in high memory and time consumption. Complexity comes mainly from the large number of free parameters in Fully Connected Layers (FCL) and the number of Multiple Accumulation Operations (MAC) in Convolutional Layers (CL). In most CNNs, 90% of parameters come from FCLs and 99% of MAC operations come from CLs. Complexity directly affects network size, learning time, inference time, and model deployability. In this article, we propose a new approach to reduce complexity and improve the performance of a CNN model for the task of Isolated Handwritten Arabic Character (IHAC) recognition. The idea of the approach was inspired by the unconscious perception concept, which is widely studied in psychology and cognitive sciences. We have attempted to model this concept at the level of hidden FCLs as follows: The neurons of hidden FCLs are divided into two blocks, namely Conscious Block (CB) and Unconscious Block (UB). CB and UB are entirely separate from each other and fully connected to the output layer. CB is large and processes few features (relevant), while UB is small and processes most features (irrelevant). Feature selection is performed at the flatten layer using what we call virtual max-pooling. This strategy significantly reduces connectivity inside FCLs, resulting in fewer free parameters. Fewer parameters mean more freedom to add more FCLs without high costs. This allows reducing the number of CLs without affecting performance, thereby reducing MAC operations. Furthermore, the strategy improves performance by focusing the network's attention on representative features. To evaluate our approach, experiments were carried out on four benchmark databases for IHAC that are: IFHCDB, AHCD, AIA9K, and HACDB. Compared to a basic CNN model, the proposed model achieved higher performance, reduced free parameters, the network’s size, training, and inference time. It also outperformed many recent models for IHAC recognition.

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Titel: UnCNN: A New Directed CNN Model for Isolated Arabic Handwritten Characters Recognition
verfasst von: Mohsine Elkhayati
Youssfi Elkettani
Publikationsdatum: 18.03.2022
Verlag: Springer Berlin Heidelberg
Erschienen in: Arabian Journal for Science and Engineering / Ausgabe 8/2022
Print ISSN: 2193-567X
Elektronische ISSN: 2191-4281
DOI: https://doi.org/10.1007/s13369-022-06652-5

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