Search results for "Segmentation techniques"

showing 3 items of 3 documents

A New High-Efficiency Procedure for Aggregate Gradation Determination of the Railway Ballast by Means Image Recognition Method

2013

Abstract The mechanical characteristics of the railway superstructure are related to the properties of the ballast, and especially to the particle size distribution of its grains. Under the constant stress-strain of carriages, the ballast can deteriorate over time, and consequently it should properly be monitored for safety reasons. The equipment which currently monitors the railway superstructure (like the Italian diagnostic train Archimede) do not make any “quantitative” evaluation of the ballast. The aim of this paper is therefore to propose a new methodology for extracting railway ballast particle size distribution by means of the image processing technique. The procedure has been teste…

BallastRailway ballast Image analysis Segmentation techniques Aggregate gradation.EngineeringRailway lineAggregate (composite)business.industryAggregate gradationRailway ballastImage processingStructural engineeringAutomotive engineeringImage analysisSegmentation techniqueslcsh:TA1-2040Settore ICAR/04 - Strade Ferrovie Ed AeroportiGradationTrainbusinesslcsh:Engineering (General). Civil engineering (General)Civil and Structural EngineeringArchives of Civil Engineering
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Image analysis for detecting aggregate gradation in asphalt mixture from planar images

2012

Abstract The mechanical properties of bituminous mixture strongly depend on the gradation of the aggregate that represents the mineral skeleton of the mixture, since for open and gap-graded mixtures, stresses due to vehicles in movement on the pavement are mainly transmitted through their contacts. Internal structure of bituminous mixture is, therefore, of great interest for road and infrastructure engineering and it is appropriate to study it with recently developed image analysis method. The purpose of this study was to finalize an effective analysis of asphalt section image for automatically extracting aggregate gradation without the need of separation of the bitumen from the aggregate. …

Image analysis Segmentation techniques Asphalt mixture Gradation controlMaterials scienceAggregate (composite)business.industryBuilding and ConstructionImage (mathematics)Digital imagePlanarAsphaltSettore ICAR/04 - Strade Ferrovie Ed AeroportiGeneral Materials ScienceSegmentationGradationGeotechnical engineeringProcess engineeringbusinessAnalysis methodCivil and Structural EngineeringConstruction and Building Materials
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UNA PROCEDURA AUTOMATIZZATA PER LA DETERMINAZIONE DELLE CARATTERISTICHE MICROSTRUTTURALI DELLE SABBIE MEDIANTE ANALISI DI IMMAGINI DI SEZIONI SOTTILI

2012

È ben noto che il comportamento meccanico microscopico delle sabbie - e in generale dei terreni granulari - trae origine dalle loro caratteristiche microstrutturali, quali, per esempio, il numero di coordinazione dei singoli grani, l’indice di contatto intergranulare (grain contact ratio) e l’indice di addensamento dei grani (packing density index). Appare, quindi, di notevole importanza la determinazione degli indici predetti con alto grado di affidabilità e di ripetibilità. Lo studio dell’assetto dei contatti intergranulari e il calcolo degli indici che lo caratterizzano, viene condotta comunemente su immagini piane dell’insieme di grani mediante esame visuale e restituzione grafica assis…

Settore ICAR/07 - GeotecnicaSettore ICAR/04 - Strade Ferrovie Ed AeroportiMicrostruttura Grain Contact Analisi di Immagini Tecniche di Segmentazione Packing Density Locked SandsMicrostructure Grain Contact Image Analysis Segmentation Techniques Packing Density Locked Sands.
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