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Browsing Departmental Conferences by Subject "3D model"

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    Age progressive person-specific 3d model for Sri Lanka
    (Computer Science & Engineering Society c/o Department of Computer Science and Engineering, University of Moratuwa., 2011-11) Anpaz, AJ; Perera, KKD; Thirunavukkarasu, R; Ajith, C; De Silva, C; Weerawardhana, S; Madusanka, A; Dilrukshi, T; Aravinda, H
    Face Age Progression is a process of predicting the face of a person with advancing years. Automation of such process with the power of the Computing is one of the huge challenges in the world. This paperexploresautomatic age progression in 3D modelespecially in Sri Lankan context where there is no such model exists in present. To implement this, Person-Specific 3D model is reconstructedusinggeneric model and asingle frontal image instead of using 3D scan or different poses of images. Then 3D modelis deformed according to the extracted person-specific features.Aging approach on 2D image isproposed based on IBSDT method. Age is progressed in Person-specific 3D model using aged 2D image, texture mapping and structural changes in the nasolabial fold area.
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    item: Conference-Abstract
    Development of a 3D model of open-graded friction course to evaluate the inter-connected air void with aggregate gradation
    (Department of Civil Engineering, University of Moratuwa, 2020-12) Dedigamuwa, KV; Mampearachchi, WK; Perera, HLK
    Open-Graded Friction Course (OGFC) is an asphalt material which has many advantages such as resistance to hydroplaning, low level of splash and spray, less headlight glare, improved visibility, a lesser number of accidents, reduced noise, and higher surface friction. OGFC is an advanced asphalt material which cannot thoroughly be understood by the results of traditional tests available. Though, OGFC consists of mastic, aggregate and air voids similar to hot mix asphalt, the porous structure of OGFC consists of a highly complicated interconnected void network. The number of voids and the void area of OGFC directly affects the durability and the permeability of the mixture. Therefore, it is necessary to increase the ratio of the area of interconnected voids to the area of total voids, in order to enhance the permeability of the OGFC mixture. A digital image analysis method has been introduced in this research in order to obtain different interconnected void structures for different gradations. This method consists of the identification of different properties such as number of void nodes, number of interconnected voids, areas of interconnected voids, reduction of interconnectivity with the depth, etc. An algorithm in “MATLAB” was developed to identify the properties of the crosssectional images obtained by the captured surfaces of the cut specimens of OGFC. The obtained cross-sectional data of aggregates, voids and mastic was used to create the plotting data of the 3D model using the algorithm developed in excel. Finally, the python tool “plotly” was used on the “Anaconda” platform to create the 3D model based on the data model created in Excel. The data of three different gradations were analyzed by the use of this method and the results were obtained. According to the pre-evaluated test data of three gradations on durability and permeability, the validity of the 3D models was analyzed. The developed 3D model from this study can be used to determine the optimum gradations of OGFC considering the durability and permeability, based on the analysis of the internal structure arrangement.
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    Development of an effective 3D mapping technique for heritage structures
    (Institute of Electrical and Electronics Engineers, Inc., 2021-09) Mahinda, MCP; Udhyani, HPAJ; Alahakoon, PMK; Kumara, WGCW; Hinas, MNA; Thamboo, JA; Abeykoon, AMHS; Velmanickam, L
    Historical buildings and structures are import ant fora country and the world since they are the only living evidence of the engineering technology of man kind. Therefore, itis of utmost importance to protect and preserve them to safe guard the identity of the particular civilizations,retain the ircultural significance, and ensure the inaccessibility to present and future generations. Since many historic structures are in a partially dilapidated state, to prevent further deterioration,itis essential to record their present status in structural engineering and building material aspects. This is typically a costly,time-demanding, unsafe, and challenging task. As a solution,3 Dgeomatics technologies, and UAVsystemsarenowbeingusedintheworldtodocument existing structures,especially in difficult-to-accessare as.This is also usually a high-cost task.In this research, an effective technique for generating structural information of anexisting building or as imilarstructure to preserve the detail so for duplicating as a truereplicais developed.The developed solution is are mote-controllable custom-made drone system with a GoPro Hero7camera.Different type so fstructures were selected, and after running several test cases,the most suitable image- taking technique and the processing plat form were identified. The effecting factors to the accuracy such as the number of images taken,and overl appercentage of images were identified and their optimum contri bution detected.As a result,the proposed solution abled to yield a dimensional accuracy of 98.9%.This study concludes that the developed effective solution is avalid alternative to high-cost3Dmappingtechniques.