Search results for " Matched Filter"

showing 3 items of 3 documents

Automatic Extraction of Blood Vessels, Bifurcations and End Points in the Retinal Vascular Tree

2008

In this paper we present an effective algorithm for automated extraction of the vascular tree in retinal images, including bifurcations, crossovers and end-points detection. Correct identification of these features in the ocular fundus helps the diagnosis of important systematic diseases, such as diabetes and hypertension. The pre-processing consists in artefacts removal based on anisotropic diffusion filter. Then a matched filter is applied to enhance blood vessels. The filter uses a full adaptive kernel because each vessel has a proper orientation and thickness. The kernel of the filter needs to be rotated for all possible directions. As a consequence, a suitable kernel has been designed …

Cross-correlationPixelAnisotropic Diffusion Matched Filter Retinal Vessels ROC curve.Computer scienceAnisotropic diffusionbusiness.industryQuantitative Biology::Tissues and OrgansMatched filterBinary imageComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONRetinalPattern recognitionchemistry.chemical_compoundTree structurechemistryKernel (image processing)Artificial intelligencebusiness
researchProduct

Hybrid Procedure for Automated Detection of Cracking with 3D Pavement Data

2016

Pavement cracks are considered a major indicator of pavement performance. Because traditional manual crack surveys are dangerous, time consuming, and expensive, technologies have been developed to collect high-speed pavement images, and numerous algorithms have been proposed to detect cracks on pavement surface. The latest PaveVision3D Ultra system (3D Ultra) has been implemented to achieve 30-kHz three-dimensional (3D) scanning rate for 1-mm resolution pavement surface data at highway speed up to 100 km/h (60  mi/h). This paper presents the application of a hybrid procedure for automated crack detection on 3D pavement data collected using 3D Ultra. The procedure combines three different me…

EngineeringSpeedup0211 other engineering and technologies02 engineering and technologyMinimum spanning treeEdge (geometry)Minimum spanning treeThree-dimensional (3D) pavement dataTensor votingCrack detection; Matched filtering; Minimum spanning tree; Tensor voting; Three-dimensional (3D) pavement data; Civil and Structural Engineering; Computer Science Applications1707 Computer Vision and Pattern Recognition021105 building & construction0502 economics and businessThree dimensional dataSettore ICAR/04 - Strade Ferrovie Ed AeroportiCivil and Structural Engineering050210 logistics & transportationbusiness.industry05 social sciencesDetectorComputer Science Applications1707 Computer Vision and Pattern RecognitionStructural engineeringMatched filteringComputer Science ApplicationsCrackingCrack detectionTensor votingbusiness
researchProduct

Optic disc positioning and blood vessels extraction on eye fundus

2009

This paper presents two methods aimed to the optic disc positioning on the retinal images. The first is based on a template of the entire image, while the second is based on the retinal vascularisation. For this second task, also a vessel extraction method is provided. Both the algorithm have been tested on test images of the Drive Database.

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniRetinaRetinal vessels vascular tree matched filter ROC curve optic disc parabola parabolic modelbusiness.industryComputer scienceRetinalImage segmentationRetinal imagechemistry.chemical_compoundmedicine.anatomical_structurechemistrymedicineMedical imagingExtraction methodsComputer visionsense organsArtificial intelligencebusinessOptic discParabolic model
researchProduct