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Visual perception on the architectural elements of the built heritage of a historic temple town： A case study of Kumbakonam, India

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Frontiers of Architectural Research 2017年第1期6卷 96-107页

作者： K. Kiruthisa K. Thirumaran Department of Architecture National Institute of Technology Tiruchirappalli Tamilnadu 620015 India

This paper aims to investigate the changes in the virtual perception on the built heritage at the traditional core setttement of Kumbakonam Town at Tamitnadu and to analyze their implica- tions. Specifically, the major objectives of the study are （1） to identify the architectural elements that manifest the built heritage of Kumbakonam Town and （2） to assess the contMbutions of these elements to the changes in the visuat perception of the town. To achieve these objectives, this study adopts an empirical model that analyzes the architectural elements of the buildings in the study area. Direct observations and documentations of 373 buildings are collected to analyze those etements that contribute to the changes in the Visual perception on the built heritage of Kumbakonam Town. An ordinary regression model is used to examine the characteristics of the built heritage across the chariot processional route of the town. Several architectural elements, including pitasters, horizontal cornices, arched windows, and ornamental parapets, improve the image of the town. These empirical findings support the policy framework that enhances the Visual perception of Kumbakonam Town.

关键词： Visual perception Built heritage Ordinal regression Architectural ele-ments Historic town

Visual perception alterations in COVID-19:a preliminary study

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International Journal of Ophthalmology(English edition) 2023年第1期16卷 1-9页

作者： María Begoña Coco-Martín Luis Leal-Vega Irene Alcoceba-Herrero Ainhoa Molina-Martín Dolores de-Fez María JoséLuque Carlos Dueñas-Gutiérrez Juan Francisco Arenillas-Lara David PPiñero Group of Applied Clinical Neurosciences and Advanced Data Analysis Department of MedicineDermatology and ToxicologyUniversity of ValladolidValladolid 47005Spain Group of Optics and Visual perception Department of OpticsPharmacology and AnatomyUniversity of AlicanteAlicante 03690Spain Department of Optics and Optometry and Vision SciencesUniversity of ValenciaValencia 46100Spain COVID-19 Unit Department of Internal MedicineUniversity Clinical Hospital of ValladolidValladolid 47003Spain Stroke Unit Department of NeurologyUniversity Clinical Hospital of ValladolidValladolid 47003Spain Clinical Optometry Unit Department of OphthalmologyVithas Medimar International HospitalAlicante 03016Spain

AIM:To compare the Visual perception(color and chromatic-achromatic contrast vision)of a small cohort of COVID-19 patients at the time of infection and after 6mo with that of a healthy population matched for sex and age.METHODS:A total of 25 patients(9 females,16 males,mean age:54±10y)with COVID-19 hospitalized in the COVID-19 Unit of the University Clinical Hospital of Valladolid were recruited for this preliminary study.Visual perception,as determined by monocular measurement of contrast sensitivity function(CSF)and color vision was assessed in each patient using the Optopad test.The results obtained were then compared with those of a sample of 16 age-and sex-matched healthy controls(5 females,11 males,mean age:50±6y)in which the same measurement procedure was repeated.Statistically significant differences between groups were assessed using the Mann-Whitney U test.Measurements were repeated after a minimum follow-up period of 6mo and statistically significant differences between the two time points in each group were assessed using the Wilcoxon signed rank test.RESULTS:Discrimination thresholds(color and chromatic-achromatic contrast vision)and their corresponding sensitivity,calculated as the inverse of the discrimination threshold,were evaluated.Analysis of the data revealed higher contrast threshold results(i.e.,worse contrast sensitivity)in the COVID-19 group than in the control group for all spatial frequencies studied in the Optopad-CSF achromatic test and most of the spatial frequencies studied in the Optopad-CSF chromatic test for the red-green and blue-yellow mechanisms.In addition,color threshold results in the COVID-19 group were also significantly higher(i.e.,worse color sensitivity)for almost all color mechanisms studied in the Optopad-Color test.At 6mo,most of the differences found between the groups were maintained despite COVID-19 recovery.CONCLUSION:The present results provide preliminary evidence that Visual perception may be impaired in COVID-19,even when the infection has passed.Although fur

关键词： SARS-CoV-2 COVID-19 Visual perception contrast sensitivity function color vision

Photonic synapses with ultralow energy consumption for artificial Visual perception and brain storage

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Opto-Electronic Advances 2022年第9期5卷 1-13页

作者： Caihong Li Wen Du Yixuan Huang Jihua Zou Lingzhi Luo Song Sun Alexander OGovorov Jiang Wu Hongxing Xu Zhiming Wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Microsystem and Terahertz Research Center China Academy of Engineering PhysicsChengdu 610200China Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China Department of Physics and Astronomy Ohio UniversityAthensOhio 45701United States State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610065China School of Physics and Technology Wuhan UniversityWuhan 430072China

The human visual system,dependent on retinal cells,can be regarded as a complex combination of optical system and nervous system.Artificial retinal system could mimic the sensing and processing function of human eyes.Optically stimulated synaptic devices could serve as the building blocks for artificial retinas and subsequent information transmission system to brain.Herein,photonic synaptic transistors based on polycrystalline MoS_(2),which could simulate human Visual perception and brain storage,are presented.Moreover,the photodetection range from visible light to near-infrared light of MoS_(2) multilayer could extend human eyes’vision limitation to near-infrared light.Additionally,the photonic synaptic transistor shows an ultrafast speed within 5μs and ultralow power consumption under optical stimuli about 40 aJ,several orders of magnitude lower than biological synapses(50 ms and 10 fJ).Furthermore,the backgate control could act as emotional modulation of the artificial brain to enhance or suppress memory function,i.***.the intensity of photoresponse.The proposed carrier trapping/detrapping as the main working mechanism is presented for the device.In addition,synaptic functionalities including short synaptic plasticity,long synaptic plasticity and paired-pulse facilitation could be successfully simulated based on the prepared device.Furthermore,the large difference between short synaptic plasticity and long synaptic plasticity reveals the better image pre-processing function of the prepared photonic synapses.The classical Pavlovian conditioning associated with the associative learning is successfully implemented as well.Therefore,the efficient and rich functionalities demonstrate the potential of the MoS_(2) synaptic device that integrates sensing-memory-preprocessing capabilities for realizing artificial neural networks with different emotions that mimic human retina and brain.

关键词： MoS_(2)synaptic transistors Visual perception ultralow power consumption memory

Real-time information recombination of complex 3D tree model based on Visual perception

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Science China(Information Sciences) 2013年第9期56卷 96-109页

作者： FAN Jing FAN YunYi DONG TianYang JI Lei School of Computer Science and Technology Zhejiang University of Technology

It is important for the rapid visualization of large scale forest scene to dynamically simplify and recombine model data. In order to preserve the geometric features and Visual perception of tree model, this paper presents a real-time information recombination method of complex 3D tree model based on Visual perception. This method adopts visual attention model and the visual characteristic of tree structures, and then uses geometry-based and image-based methods to simplify tree models and construct a hybrid representation model. The hybrid representation model reflects the Visual perception features of 3D tree models that can embody topological semantics in dynamic simulation. In addition, this method automatically extracts the representation information of 3D tree model based on Visual perception, and recombines model information in real time according to the dynamic viewpoint of virtual scene. Finally, this method is applied in the simplification of different tree models, and it is compared with the existing tree model simplification methods. Experimental results show that this method can not only preserve better Visual perception for 3D tree models, but also effectively decrease the geometric data of forest scene, and improve the rendering efficiency of forest scene.

关键词： Visual perception model simplification 3D tree real-time recombination hybrid representation

Defect detection and classification for mobile phone cover glass based on Visual perception

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Defect detection and classification for mobile phone cover g...

第32届中国控制与决策会议

作者： Mingbo Yang Bohao Zhang Jiabin Zhang Hu Su Mechatronics Department North China University of Technology University Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences

In order to improve the product quality,defect detection is a significant concern in the production of MPCG（Mobile Phone Cover Glass）.Aiming at this problem,an automatic defect detection system is developed in this paper.The system adopts backlight imaging strategy to improve the Signal-to-noise ratio（SNR）.With the captured images,an adaptive binarization algorithm is firstly adopted and improved which is based on integral graph to achieve high real-time performance.A multi-dimensional feature vector is then designed for defect classification to eliminate noise interference.Finally,the effectiveness of the proposed algorithm is experimentally verified during MPCG production process.It is further demonstrated that the algorithm and system developed in this paper could satisfy the requirements of both speed and accuracy under the situation of industrial scene.

关键词： MPCG Visual perception defect detection defect classification

Target Tracking Algorithm Based on Visual perception Mechanism

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Target Tracking Algorithm Based on Visual Perception Mechani...

2013年中国智能自动化学术会议

作者： Peng Lu Shilei Huang Chi Liu Daoren Yuan Yafei Lou School of Electrical Engineering Zhengzhou University

A method based on Visual perception mechanism is proposed for solving the problem of target tracking.The tracking of target can he achieved in stability.In this paper,the algorithm use neural responses as the visual features. Firstly,the receptive field of cells in primary visual cortex is obtained from natural images.Then the neurons response of background image and video image sequences can be received and calculated the difference,and the difference is compared with dynamic threshold,the target can he detected in this way.Finally, the target tracking can be realized by iterative.Many categories experiment results show that this method improve accuracy and robustness of the tracking algorithm in condition of time-real.

关键词： Target tracking Visual perception Overcomplete set Neural responses

Research of Human Visual perception Mechanisms for Object Tracking

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Research of Human Visual Perception Mechanisms for Object Tr...

第13届中国系统仿真技术及其应用学术年会

作者：赵宇宙陈宗海 Department of Automation University of Science and Technology of China

The theories and models of human Visual perception are aim to understand and emulate the intelligent properties of human vision system,and have important reference value to traditional computer vision research. In this paper,based on mechanisms of visual attention,we discuss the problem of object tracking in the perspective of visual attention. A framework of attention based tracking strategy is proposed and implemented,and the advantages and lacks are discussed after experiments. We hope to provide a reference for the further research of biologically motivated object tracking.

关键词： Visual perception visual attention mechanism object tracking feature selection feature learning

Image Quality Evaluation Based on Human Visual perception

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Image Quality Evaluation Based on Human Visual Perception

2009中国控制与决策会议

作者： Fan Zhang~(1,2),YuliXu~2 1.Institute of Advanced Control and Intelligent Information Processing,Henan University,Kaifeng 475001,China 2.College of Computer and Information Engineering,Henan University,Kaifeng,475001,China

＜正＞This paper introduces two concepts of the traditional quality evaluation:the subjective evolution and objective evaluation,and then several kinds of common used human Visual perception image quality judgment criterion are introduced,such as:assessing the quality of enhanced images based on human Visual perception,image quality assessing model by using neural network and support vector machine,gradient information based image quality assessment, natural image quality assessment metric based on wavelet-based contour-let transform,image quality assessment method based on contrast sensitivity.Some possible development directions are given for the image quality assessment research.

关键词： image quality assessment subjective assessment objective assessment Visual perception

Achieving the Visual perception and Gestalt Psychology in Sultan Hassan Mosque Building

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Open Journal of Applied Sciences 2021年第1期11卷 21-40页

作者： Essam Metwally Department of Interior Design Faculty of Architecture and Design American University of Madaba Amman Jordan

The gestalt principles are perception and what is visually communicated by objects. These principles describe the visual language within which we work. Understanding how a designer realizes things visually will help designers communicate better. Many designers use Gestalt principles to have a structure visual stimulus, so as to create interfaces that are easy for users to understand. Because the understanding of Visual perception is a critical item in any designer’s toolkit. Islamic heritage buildings also contain many architectural values, especially the Sultan Hassan Mosque in Cairo. Through this paper, we will verify the use of gestalt principles of Visual perception in the building design. Because the psychological organization of the design, achieves the understanding and awareness of the current relationships between the elements, depending on the extent of regularity, accuracy, and consistency of the design elements. This makes us recognize the esthetic values of Sultan Hassan’s building and mosque. The visual delight we get from architecture begins with how we perceive it. So, in order to understand how visual delight arises, we must first understand how we perceive and interpret visual stimuli. Especially since the principles of gestalt confirm that the human brain tends to make tricks and illusions. Therefore, we found the mosque designer had exploited this fact during the design process, to exclude any possibility of the resulting misunderstanding. The designer achieved the psychological preparation of the visitor by using some principles of Visual perception of the Gestalt theory, such as growth, continuity, and hierarchy.

关键词： Gestalt Principles Visual perception Psychological Organization Esthetic Values Islamic Heritage Buildings