Three dimensional image processing and analysis, particularly, the imaging and reconstruction of an environment in three dimensions  has received significant attention, interest and concern  during the recent years. In the light of this background, this research study intends to provide an efficient way to reconstruct an irregular surfaced object, for example "the sole of a shoe", with good precision at a low cost using XBOX Kinect V2.0 sensor. Three dimensional reconstruction can be achieved either by using active or passive methods. Active methods make use of light source such as lasers or infra-red emitters for scanning a given environment and measuring the depth, to create a depth map. In contrast, in passive methods, colour images of the environment in different perspectives are used to create a three dimensional model of the environment. In this study, an active method using a set of depth maps of the object of interest is implemented, where the object of interest is represented by a sole of a shoe. Firstly, a set of depth maps of the object of interest are acquired in different perspectives. The acquired depth maps are first pre-processed for removing any outliers in the data acquired and are then enhanced. Enhanced depth maps are converted into 3D point clouds using the intrinsic parameters of the Kinect sensor. These obtained point clouds are subsequently registered into a single position using the Iterative Closest Point(ICP) algorithm. Aligned point clouds of the object of interest are then merged to form a single dense point cloud of the object of interest. Analysis of the generated single dense point cloud has shown that accurate 3D reconstruction of the real object of the interest has been achieved.

Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2016-08-02T18:04:32Z No. of bitstreams: 2 Dissertação - Milca Abda de Morais - 2016.pdf: 1177590 bytes, checksum: a2fc0022587433cf6c472a76a4c217da (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-08-03T13:08:30Z (GMT) No. of bitstreams: 2 Dissertação - Milca Abda de Morais - 2016.pdf: 1177590 bytes, checksum: a2fc0022587433cf6c472a76a4c217da (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2016-08-03T13:08:30Z (GMT). No. of bitstreams: 2 Dissertação - Milca Abda de Morais - 2016.pdf: 1177590 bytes, checksum: a2fc0022587433cf6c472a76a4c217da (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2016-06-10 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / Population aging is considered a world-wide phenomenon. Several changes are caused by aging, among them, the higher prevalence of mood disorders, such as depression and anxiety. Some evidences have indicated positive effects of some types of exercise on reduction of depression and anxiety. The aims of the present study were: a) to evaluate the acute effects of exercise in the Xbox Kinect on the mood of the untrained elderly people; b) investigate possible correlations between the degree of enjoyment in the activity and improvement in mood. We selected twenty-nine elderly (15 men and 14 women), with age of 66,4 ± 0,8 years (mean ± standard error). The participants were evaluated in two conditions: Control Condition (CC), in which volunteers watched the film "The March of the Penguins" (60 minutes) and Experimental Condition (EC), which consisted of one session of exercise with the Xbox Kinect (60 minutes). The order of conditions was randomly defined. The mood state was evaluated in the pre and post-interventions using the POMS questionnaire (Profile of Mood States). The PACES Scale (Physical Activity Enjoyment Scale) was used to evaluate the degree of enjoyment. For both conditions, there was a significant reduction in the scores of tension-anxiety, depression and total mood disorder (p ≤ 0,05). There were not significant differences between the conditions for all studied variables. There was a significant negative correlation at the EC, between the percentage of enjoyment and the scores of tension-anxiety (r = -0.40), depression (r = -0.40) and total mood disorder (r = -0.49), evaluated by POMS (p ≤ 0,05). On the other hand, no significant correlations were found in the CC for the same variables. Thus, we could conclude that both activities promote improvements in mood state in untrained elderly, however, the effect sizes observed after CC were lower (smaller) those observed after EC (median), indicating most significant clinical effects in the EC. Moreover, higher enjoyment during the activity in the Xbox Kinect was associated with greater improvement in mood states. / O envelhecimento populacional é considerado um fenômeno de amplitude mundial. Diversas alterações são provocadas pelo envelhecimento, entre elas, o aumento da prevalência de transtornos do humor, como a depressão e a ansiedade. Evidências científicas demonstram efeito positivo de diversos tipos de exercício físico na redução desses sintomas. Os objetivos do presente estudo foram: a) avaliar o efeito agudo de atividades realizadas no Xbox Kinect sobre o estado de humor de idosos destreinados; b) verificar as possíveis relações entre o grau de diversão da atividade e a melhora no humor. Foram selecionados vinte e nove idosos (15 homens e 14 mulheres), com idade de 66,4 ± 0,8 anos (média ± erro padrão). Os participantes foram avaliados em duas condições: Condição Controle (CC), na qual os participantes assistiram ao filme “A Marcha dos Pinguins” (60 minutos) e Condição Experimental (CE), que consistiu em uma sessão de atividades no Xbox Kinect com duração de 60 minutos. A ordem das condições foi definida de forma aleatória. O estado de humor foi avaliado nos momentos de pré e pós-intervenções através da aplicação do questionário de POMS (Profile of Mood States). A Escala de PACES (Physical Activity Enjoyment Scale) foi utilizada para avaliar o grau de diversão das atividades. Para ambas as condições, houve uma redução significante dos escores de tensão-ansiedade, de depressão e do distúrbio total de humor (p ≤ 0,05). Não foram observadas diferenças significantes entre as condições nas variáveis estudadas. Houve uma significante correlação negativa, na CE, entre o percentual de diversão e os deltas dos escores de tensão-ansiedade (r= -0,40), depressão (r= -0,40) e o distúrbio total de humor (r= -0,49), avaliado pelo POMS (p ≤ 0,05). Por outro lado, não foram encontradas correlações significantes na CC, para as mesmas variáveis. Assim, pode-se concluir que a sessão aguda de atividade no Xbox Kinect, bem como a condição controle (filme) promoveram melhoras no estado de humor de idosos destreinados, no entanto, os tamanhos de efeito observados após a CC foram inferiores (pequenos) aos observados após a CE (médios), indicando efeitos clínicos mais significantes na CE. Além disso, quanto maior foi a diversão durante a atividade realizada no Xbox Kinect, maior foi a melhora no estado de humor.