Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-26T17:46:30Z No. of bitstreams: 1 AlysonMatheusDeCarvalhoSouza_DISSERT.pdf: 5735657 bytes, checksum: e01d871f402904e1e865bcf5257146d3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-27T22:06:43Z (GMT) No. of bitstreams: 1 AlysonMatheusDeCarvalhoSouza_DISSERT.pdf: 5735657 bytes, checksum: e01d871f402904e1e865bcf5257146d3 (MD5) / Made available in DSpace on 2016-01-27T22:06:43Z (GMT). No. of bitstreams: 1 AlysonMatheusDeCarvalhoSouza_DISSERT.pdf: 5735657 bytes, checksum: e01d871f402904e1e865bcf5257146d3 (MD5) Previous issue date: 2014-09-25 / A percep??o correta de dist?ncias ? importante para a execu??o de diversas tarefas interativas, como navega??o, sele??o e manipula??o. ? sabido, no entanto, que, em geral, existe uma significativa compress?o das dist?ncias percebidas em ambientes virtuais, principalmente quando h? a utiliza??o de Head-Mounted Displays - HMDs. Essa compress?o de dist?ncias percebidas pode trazer ? aplica??o diversos problemas e at? afetar negativamente a utilidade de aplica??es que dependem desse julgamento correto. A comunidade cient?fica, at? o presente, n?o conseguiu determinar as causas do fen?meno da compress?o da percep??o de dist?ncia em ambientes virtuais. Por esse motivo, foi o objetivo desse trabalho buscar, atrav?s de experimentos com usu?rios, encontrar pistas sobre a influ?ncia do field-of-view - FoV - e dos m?todos para estimativas de dist?ncias nessa compress?o percebida. Para tal, foi feita uma compara??o experimental entre o my3D e o HMD, utilizando 32 participantes, a fim de encontrar pistas sobre as causas da percep??o comprimida. Os resultados indicaram que o my3D possui capacidades inferiores ao HMD, produzindo estimativas piores, em m?dia, em ambos os m?todos de estimativa testados. As causas apontadas para tal foram o est?mulo incorreto da vis?o perif?rica, o FoV inferior e a menor imers?o, segundo descrito pelos participantes do experimento / The correct distance perception is important for executing various interactive tasks such as navigation, selection and manipulation. It is known, however, that, in general, there is a significant distance perception compression in virtual environments, mainly when using Head-Mounted Displays - HMDs. This perceived distance compression may bring various problems to the applications and even affect in a negative way the utility of those applications that depends on the correct judgment of distances. The scientific community, so far, have not been able to determine the causes of the distance perception compression in virtual environments. For this reason, it was the objective of this work to investigate, through experiments with users, the influence of both the field-of-view - FoV - and the distance estimation methods on this perceived compression. For that, an experimental comparison between the my3D device and a HMD, using 32 participants, seeking to find information on the causes of the compressed perception, was executed. The results showed that the my3D has inferior capabilities when compared to the HMD, resulting in worst estimations, on average, in both the tested estimation methods. The causes of that are believed to be the incorrect stimulus of the peripheral vision of the user, the smaller FoV and the smaller immersion sense, as described by the participants of the experiment.