Brazilian Sign Language Alphabet Dataset

Authors

Bianka Tallita Passos, Anita Maria da Rocha Fernandes, Eros Comunello

Affiliations

University of Itajaí Valley – UNIVALI. Santa Catarina – Brazil.

Data Description

This database contains images of Brazilian Sign Language Alphabet - (BSL, also known as LIBRAS). The database was developed using images previously available in Kaggle¹. The characteristics of the data obtained are listed below:

• The database consists of 3,000 images of each sign representing the alphabet of the American Sign Language - ASL - which are 200x200 pixels.;
• The images show variations in scale, distance, lighting and execution; and
• The catches have a homogeneous background.

This database was developed using only the images available in Kaggle. In all, images of 15 ASL static signals were selected, which have the same representation in LIBRAS. The database contains 4411 images of signs representing the LIBRAS alphabet. The characteristics of the database are:

• It contains images representing 15 signs of the LIBRAS alphabet: A, B, C, D, E, I, L, M, N, O, R, S, U, V and W;
• Each class/sign of the alphabet has between 150 and 600 samples;
• The images have homogeneous background; and
• The images have annotations that delimit the area of the image belonging to the object/sign of the alphabet.

Figure 1 shows some images present in this database.

The annotation of the object present in the image was performed with the aim of creating a ground truth for evaluating algorithms of object detection, as well as enabling the training of classifiers to perform the detection.

The annotations were made with LabelImg² - a graphic tool that can be used to annotate images by creating a bounding box on the objects of interest - as shown in Figure 2.

As a result a file in XML (Extensible Markup Language) format is generated containing the ROI (region of interest) coordinates of all the bounded objects, as well as their label.

References

¹ https://www.kaggle.com/grassknoted/asl-alphabet

² https://github.com/tzutalin/labelImg

DOI

10.17632/k4gs3bmx5k.5

Cite this dataset

Passos, Bianka Tallita; Fernandes, Anita M. R.; Comunello, Eros (2020), “Brazilian Sign Language Alphabet”, Mendeley Data, V5, doi: 10.17632/k4gs3bmx5k.5

Corresponding author(s)

Bianka Passos

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