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Proceedings Paper

Point cloud subjective evaluation methodology based on reconstructed surfaces
Author(s): Evangelos Alexious; Antonio M. G. Pinheiro; Carlos Duarte; Dragan Matković; Emil Dumić; Luis A. da Silva Cruz; Lovorka Gotal Dmitrović; Marco V. Bernardo; Manuela Pereira; Touradj Ebrahimi
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Paper Abstract

Point clouds have been gaining importance as a solution to the problem of efficient representation of 3D geometric and visual information. They are commonly represented by large amounts of data, and compression schemes are important for their manipulation transmission and storing. However, the selection of appropriate compression schemes requires effective quality evaluation. In this work a subjective quality evaluation of point clouds using a surface representation is analyzed. Using a set of point cloud data objects encoded with the popular octree pruning method with different qualities, a subjective evaluation was designed. The point cloud geometry was presented to observers in the form of a movie showing the 3D Poisson reconstructed surface without textural information with the point of view changing in time. Subjective evaluations were performed in three different laboratories. Scores obtained from each test were correlated and no statistical differences were observed. Scores were also correlated with previous subjective tests and a good correlation was obtained when compared with mesh rendering in 2D monitors. Moreover, the results were correlated with state of the art point cloud objective metrics revealing poor correlation. Likewise, the correlation with a subjective test using a different representation of the point cloud data also showed poor correlation. These results suggest the need for more reliable objective quality metrics and further studies on adequate point cloud data representations.

Paper Details

Date Published: 17 September 2018
PDF: 14 pages
Proc. SPIE 10752, Applications of Digital Image Processing XLI, 107520H (17 September 2018); doi: 10.1117/12.2321518
Show Author Affiliations
Evangelos Alexious, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Antonio M. G. Pinheiro, Univ. da Beira Interior (Portugal)
Carlos Duarte, Univ. de Coimbra (Portugal)
Dragan Matković, Univ. North (Croatia)
Emil Dumić, Univ. North (Croatia)
Luis A. da Silva Cruz, Univ. de Coimbra (Portugal)
Lovorka Gotal Dmitrović, Univ. North (Croatia)
Marco V. Bernardo, Univ. da Beira Interior (Portugal)
Manuela Pereira, Univ. da Beira Interior (Portugal)
Touradj Ebrahimi, Ecole Polytechnique Fédérale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 10752:
Applications of Digital Image Processing XLI
Andrew G. Tescher, Editor(s)

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