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Open AccessArticle

A Real-World Approach on the Problem of Chart Recognition Using Classification, Detection and Perspective Correction

1
Computer Science Graduate Program (PPGCC), Federal University of Pará (UFPA), 66075-110 Belém, Brazil
2
Institute of Electronics and Informatics Engineering of Aveiro (IEETA), Department of Electronics, Telecommunications e Informatics (DETI), University of Aveiro (UA), 3810-193 Aveiro, Portugal
3
Computer Science Graduate Program (PGCOMP), Federal University of Bahia (UFBA), 40210-630 Salvador, Brazil
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(16), 4370; https://doi.org/10.3390/s20164370
Received: 8 June 2020 / Revised: 10 July 2020 / Accepted: 13 July 2020 / Published: 5 August 2020
(This article belongs to the Special Issue Document-Image Related Visual Sensors and Machine Learning Techniques)
Data charts are widely used in our daily lives, being present in regular media, such as newspapers, magazines, web pages, books, and many others. In general, a well-constructed data chart leads to an intuitive understanding of its underlying data. In the same way, when data charts have wrong design choices, a redesign of these representations might be needed. However, in most cases, these charts are shown as a static image, which means that the original data are not usually available. Therefore, automatic methods could be applied to extract the underlying data from the chart images to allow these changes. The task of recognizing charts and extracting data from them is complex, largely due to the variety of chart types and their visual characteristics. Other features in real-world images that can make this task difficult are photo distortions, noise, alignment, etc. Two computer vision techniques that can assist this task and have been little explored in this context are perspective detection and correction. These methods transform a distorted and noisy chart in a clear chart, with its type ready for data extraction or other uses. This paper proposes a classification, detection, and perspective correction process that is suitable for real-world usage, when considering the data used for training a state-of-the-art model for the extraction of a chart in real-world photography. The results showed that, with slight changes, chart recognition methods are now ready for real-world charts, when taking time and accuracy into consideration. View Full-Text
Keywords: chart recognition; deep learning; visualization; classification; detection; perspective correction chart recognition; deep learning; visualization; classification; detection; perspective correction
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Araújo, T.; Chagas, P.; Alves, J.; Santos, C.; Sousa Santos, B.; Serique Meiguins, B. A Real-World Approach on the Problem of Chart Recognition Using Classification, Detection and Perspective Correction. Sensors 2020, 20, 4370.

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