Virtual, Augmented and Mixed Reality

Abstract

Abstract. We here describe a novel approach for locally obtaining pose estimation of match feature points, observed using RGB-D cameras, in order to apply to locally planar object pose estimation with RANSAC method for augmented reality systems. Conventionally, object pose estimation based on RGB-D cameras are achieved by the correlation between observed 3D points captured by feature point matching and known 3D points of the object. However, in such methods, features are simplified as single 3D points, losing information of the feature and its neighborhood surface. This approach based on local 3D pose estimation of locally planar feature points, brings richer information for 3D pose estimation of planar, 3D rigid or deformable objects. This information enables more stable pose estimation across RANSAC settings than conventional threepoints RANSAC methods.

The Benefits of emotion Regulation Interventions in Virtual Reality for the Improvement of Wellbeing in Adults and Older Adults: A Systematic Review

“…Table 2 shows the results for the risk of bias assessment. All the studies included in this review reported the sampling method [41][42][43][44][45][46][47][48][49][50][51], although the performance and the detection biases during blinding phase were unclear for all but one [41]. Concerning the outcomes, only two studies [45,47] presented high risk of bias for missing data handled appropriately or for missing a match between methods and results.…”

“…Two of these used Mindfulness-based Stress Reduction (MBSR) Meditation through virtual environments as a non-pharmacological approach to treating chronic disorders, such as chronic pain [43], and patients with traumatic brain injuries [44]. In both studies, virtual meditation was significantly more effective than MBSR alone in reducing reported levels of pain [43], and at making participants experience a higher level of satisfaction [44]. Singh et al have examined the impact of VR games on psychological wellbeing, upper limb motor function and reaction time in adults with physical disabilities.…”

“…Among the studies that have used immersive VR systems, two have selected a head-mounted display in combination with a smartphone and a head-tracker [42,44]. However, in the study conducted by Tong et al [43], the authors used a Virtual Meditative Walk system that requires the use of a stereoscopic VR display. The display was mounted on a movable arm to ensure flexibility and to ease patient comfort.…”

“…The display was mounted on a movable arm to ensure flexibility and to ease patient comfort. Furthermore, the authors used a sensor in order to track changing arousal levels, which are small clips put onto two of the patient's fingertips [43]. In the DEEP biofeedback game study, participants had to use deep diaphragmatic breathing in order to navigate in an immersive virtual environment through an enchanted underwater world [48].…”

“…A study by Villani and Riva (2008) [42] shows a significant reduction of anxiety, as well as a significant improvement of positive emotional states, in particular, relaxation, measured through physiological parameters that demonstrate good fluctuations of respiration rate, heart rate, and skin conductance. Tong et al use a VR system that incorporates biofeedback mechanisms to support the learning of mindfulness practice [43]. This technological intervention may be an effective and long term non-pharmacological alternative to traditional pain management [43].…”