Visual Comfort Assessment for Stereoscopic Image Retargeting

In recent years, visual comfort assessment (VCA) for 3D/stereoscopic content has aroused extensive attention. However, much less work has been done on the perceptual evaluation of stereoscopic image retargeting. In this paper, we first build a Stereoscopic Image Retargeting Database (SIRD), which contains source images and retargeted images produced by four typical stereoscopic retargeting methods. Then, the subjective experiment is conducted to assess four aspects of visual distortion, i.e. visual comfort, image quality, depth quality and the overall quality. Furthermore, we propose a Visual Comfort Assessment metric for Stereoscopic Image Retargeting (VCA-SIR). Based on the characteristics of stereoscopic retargeted images, the proposed model introduces novel features like disparity range, boundary disparity as well as disparity intensity distribution into the assessment model. Experimental results demonstrate that VCA-SIR can achieve high consistency with subjective perception

Daylight adaptive optimal lighting system control strategies for energy savings and visual comfort in commercial buildings

Artificial lighting of commercial buildings in Malaysia consumes 21% of the total electrical energy. Therefore, reducing the energy is required to achieve sustainable buildings (i.e., higher energy efficiency and visual comfort), by implementing optimal light sensor placement method and optimisation-based control strategy. However, in recent works related to light sensor placement, energy performance and illuminance uniformity (Uo) are not considered, and the results did not provide the optimal number of sensors to be employed. To optimise power consumption (PC) and visual comfort simultaneously through the optimisation-based control strategy, the previous work developed a visual comfort model to represent Uo. However, the model did not consider daylight and the results of Uo need further improvement. This research proposes: (1) a new optimal light sensor placement method (OLSPM) by using combined particle swarm optimisation (PSO) and fuzzy logic controller (FLC) denoted as OLSPM-PSOFLC, and (2) a new visual comfort metric called illuminance uniformity deviation index (IUDI) and incorporated with multi-objective PSO (MOPSO) for solving energy consumption and visual comfort problem. The OLSPM�PSOFLC is developed to determine the optimal number and position of light sensors by considering PC while satisfying average illuminance level (Eav) and Uo. To ensure both PC and Uo in the room are always at the optimum levels, the IUDI with MOPSO is developed. Before the proposed methods are implemented, retrofitting lighting system is implemented first to determine the best lamp technology to be installed in terms of technical and economic metrics. An actual office room is considered for carrying out the proposed methods. The comparative results showed that the OLSPM�PSOFLC significantly reduced the number of sensors, energy consumption, carbon dioxide emission, payback period, and life cycle cost were 66%, 23%, 23%, and 30%, respectively, compared to the multi-sensor. Meanwhile, based on the comparative study of the IUDI and CVRMSE, the IUDI showed superior performance with 6% and 27% improvement of Uo and energy savings, respectively. Based on their superiority, the newly developed methods can be potentially implemented for all types of rooms and are very useful methodologies towards sustainable commercial buildings

Application of C-SVM Classification Algorithm to the Lighting Visual Comfort of University Classrooms

Considering the quality of the classroom light-environment will directly affect students\u27 eye health and learning efficiency, it is a problem to be solved that how to evaluate the visual comfort levels of the classroom light-environment and save lighting energy on the premise of necessary visual comfort. Aiming at these problems above, this study restored the classroom scene through adjustable full-size light-environment simulation laboratory, in which 135 subjects participated in the visual comfort evaluation experiment of the indoor light-environment. After features (illuminance and correlated color temperature) and labels (comfort levels) preprocessed ,we trained and visualized the visual comfort classification models of desktop reading and blackboard reading using the algorithms of C-Support Vector Machine (C-SVM). Through the contour map and the scatter diagram, we get the classification boundary of different comfort levels and the relationship between visual comfort and lighting parameters, which has guiding significance to classroom lighting design and evaluation

Visual Comfort with LED Lighting

A widely accepted definition of human comfort does not exist, but several metrics have been developed to quantify how much users appreciate environments, objects or interfaces. For visual comfort one of the most widely accepted approach is “that comfort is not discomfort”, because it is easier to provide quantitative and qualitative evaluation of visual discomfort parameters rather than comfort parameters that we don’t have a definition of. This paper presents the available suggestions and the results of a European research project about the visual comfort with LED lighting

An Assessment of the Spatial Comfort at the Open Piazza of Baiturrahman Mosque, Banda Aceh, Indonesia

 The Baiturrahman Grand Mosque is well-known as the identity of Banda Aceh town, Indonesia. The extensive renovation was carried out in 2015 to the Mosque, presenting an open piazza coated with glossy white marble replacing the previous greeneries and grass. This change creates a much different thermal sensation of the prior environment. This condition also invites the contrast to respond and define spatial comfort, including thermal and visual comfort. Therefore, this study conducts an assessment of thermal and visual comfort at the open piazza, which was done through field measurements. The outdoor thermal comfort was calculated using the equations proposed by Sangkertadi that are appropriate for the tropics. The visual comfort was examined using the De Boer glare scale. The result shows the discomfort appearance for both thermal and visual comfort. The study gives recommendations, such as planting greeneries, providing more shades for achieving lower outdoor air temperature. Replacing the glossy marble with the diffusing and rough surface will reduce the glare for getting the more acceptable visual comfort against the marbles

Kajian Penerapan Material pada Selubung Bangunan yang Mempengaruhi Kenyamanan Termal dan Visual

Central Library of UI is one of the most important facility to support an educational activities at University of Indonesia, Depok. With the most important fungtion of this building, thermal and visual comfort is necessary for supporting an activities in it. This research purposed to know how the buliding cover materials influenced thermal and visual comfort in buildings. The research object selected because Central Library of UI has built with applicated sustainable concept. Thermal comfort influenced by thermal comfort quality, kind of color materials building cover selection, and transparent material broad. Visual comfort influenced by lighting system, lamp used, and direction and scoop of light. Research methods used in this study is a qualitative research method, quantitative, and qualitative quantitaived. At the end of results of quantitative and qualitative analysis of weighted quantitatively. This study is expected to be a reference when desiging libraries that support thermal and visual comfort in buliding

Kajian Penerapan Material pada Selubung Bangunan yang Mempengaruhi Kenyamanan Termal dan Visual

Central Library of UI is one of the most important facility to support an educational activities at University of Indonesia, Depok. With the most important fungtion of this building, thermal and visual comfort is necessary for supporting an activities in it. This research purposed to know how the buliding cover materials influenced thermal and visual comfort in buildings. The research object selected because Central Library of UI has built with applicated sustainable concept. Thermal comfort influenced by thermal comfort quality, kind of color materials building cover selection, and transparent material broad. Visual comfort influenced by lighting system, lamp used, and direction and scoop of light. Research methods used in this study is a qualitative research method, quantitative, and qualitative quantitaived. At the end of results of quantitative and qualitative analysis of weighted quantitatively. This study is expected to be a reference when desiging libraries that support thermal and visual comfort in buliding

Personal control of correlated color temperature of light:Effects on thermal comfort, visual comfort, and cognitive performance

Recent studies have suggested that thermal and visual comfort are correlated, although the causality underlying this correlation is unclear. Personal control of correlated color temperature (CCT) provides individual visual comfort, but its effects on other parameters such as thermal comfort and cognitive performance remain underexamined. Therefore, we investigated if personal control of CCT can, on top of visual comfort, enhance thermal comfort and cognitive performance in office scenarios while exposed to mild cold (17 °C) using a 2x2 within-subject design. Sixteen participants were initially exposed to CCT of either 2700 K or 5700 K for 70 min. In the subsequent 70 min, participants either had free control of CCT or no control. As expected, personal control of CCT improved visual comfort and mitigated perceived eye-related symptoms. However, it did not significantly affect thermal comfort for either antecedent CCT. When the antecedent CCT was 5700 K, personal control of CCT increased alertness and physiological arousal, improved the planning and verbal cognitive performance, but, unexpectedly, decreased performance on mental spatial manipulation tasks. Additional analyses then explored the role of the psychological and personalization effects of personal control by controlling for the actual CCT. These suggest that control benefited visual comfort, eye-related symptoms, perceived task performance, pleasure, alertness and physiological arousal. This study is one of the first studies to demonstrate that visual comfort does not causally affect thermal comfort. Personal control of CCT benefits visual appraisals and eye-related symptoms, sometimes improves alertness, but differentially influences cognitive performance depending on the task type.</p

Factors influencing audio-visual comfort evaluation in the metro commercial space

Metro commercial spaces have a potential audio-visual problem because of lack of outside openings. China has built plenty metro commercial entities with its rapid urban development, in which the audio-visual comfort has been concerned as current situation is not good. In order to improve space quality and then enhance staying willing in the metro commercial space, this paper illustrates a study of influencing factors on aural and visual comfort in the metro commercial space. The study takes three metropolises (Shenzhen, Hong Kong and Guangzhou) into account and investigated 103 metro commercial cases. In the study, the spatial differences on aural and visual comfort were firstly examined, and then physical factors of the acoustic and visual environments were considered. It is found that correlations of various acoustic and visual environmental factors on aural and visual comfort were not significant as the correlation value is rather low. If taking spatial differences into account, closer relations could be found. It discovered that visual environmental factors could influence aural comfort, and the vice versa. The factors of saturation, brightness, illuminance and roughness from the visual environment, and sound level and sources from the acoustic environment, are significantly influence aural and visual comfort especially to a typical spatial type of the metro commercial space