Dataset

Construction of the dataset

In 2D digital images can be found different scenes, which contain elements such as textures, edges, shapes, colors, shadows, etc., from which relevant information can be extracted and used in research through the implementation of shadow detection algorithms. This information is used to establish the relationship between the geometry of the object, the light source and the shadow area. It is also understood that shadows are a source of relevant information at the level of shapes of surfaces or objects, allowing to locate areas of interest in an image, direction of the illumination source, geometry of the shape, among other characteristics (Kriegman, Belhumeur 1998).


These geometric properties of shadows are of special interest for this work, because they allow establishing perceivable relationships between shapes, shadows and illumination, according to the structure and height of the surface (Knill, Mamassian and Kersten 1997).



After reviewing the content of the Datasets, it is identified that they do not meet several of the requirements proposed here. Therefore, it is proposed to build the dataset according to the requirements, among them, that it can be scalable in the amount of data, different sizes of shapes and objects, being able to include new real photographs of geometric shapes with their shadows, including features that are essential to optimize the results. In addition, the images can be organized and/or classified in folders according to the most relevant features, which is a way to properly structure the dataset.


Diagram: Dataset with geometric figures


Contact

  • Julian Rene Munoz B

  • Telephone/Cellular: (57) 3108987728, 3137063049 (Colombia)

  • Email: jmb@unicauca.edu.co, juremu82@gmail.com, jrmb82@hotmail.com

Tools used:

Imagej:

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Anaconda: Tensorflow, keras, etc.

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MatLab:

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About

  • Postgraduate Student at the University of Cauca

  • University Professor and Researcher

  • Faculty of Electronic Engineering and Telecommunications

  • Department of Telecommunications

  • R&D Group in New Technologies in Telecommunications - GNTT

  • Line of research: Signals and Telecommunications Systems

Bibliographic References

The following are some of the references:

Panagopoulos, A., Hadap, S. and Samaras, D. (2013) ‘Reconstructing shape from dictionaries of shading primitives’, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 7727 LNCS (PART 4), pp. 80–94.

Bouguett, J., Webert, M. and Peronat, P. (1999a) ‘What do planar shadows tell about scene geometry’, IEEE.

Varol, A. et al. (2012) ‘Monocular 3D reconstruction of locally textured surfaces’, IEEE Transactions on Pattern Analysis and Machine Intelligence, 34(6), pp. 1118–1130. DOI: 10.1109/TPAMI.2011.196.

Forsyth, D. and Zisserman, A. (1989) ‘Mutual illumination’, (v), pp. 466–473. DOI: 10.1109/cvpr.1989.37889 .

Vicente, T. F. Y., Yu, C.-P. and Samaras, D. (2014) ‘Single Image Shadow Detection Using Multiple Cues in a Supermodular MRF’, pp. 126.1-126.11. DOI: 10.5244/c.27.126.

Cammarano, M. and Hanrahan, P. (2002) ‘Shadow Silhouette Maps’, ACM Transacciones de ACM en gráficos, 22, pp. 521–526.

Daum, M. et al. (1998) ‘On 3-D Surface Reconstruction Using Shape from Shadows’, IEEE Con- ference on Computer Vision and Pattern Recognition (CVPR), pp. 1–8.