{"id":"https://openalex.org/W1517283604","doi":"https://doi.org/10.1109/tbme.2008.2005997","title":"Enhancing the Standard Operating Range of a Placido Disk Videokeratoscope for Corneal Surface Estimation","display_name":"Enhancing the Standard Operating Range of a Placido Disk Videokeratoscope for Corneal Surface Estimation","publication_year":2008,"publication_date":"2008-10-07","ids":{"openalex":"https://openalex.org/W1517283604","doi":"https://doi.org/10.1109/tbme.2008.2005997","mag":"1517283604","pmid":"https://pubmed.ncbi.nlm.nih.gov/19389686"},"language":"en","primary_location":{"id":"doi:10.1109/tbme.2008.2005997","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tbme.2008.2005997","pdf_url":null,"source":{"id":"https://openalex.org/S5240358","display_name":"IEEE Transactions on Biomedical Engineering","issn_l":"0018-9294","issn":["0018-9294","1558-2531"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Biomedical Engineering","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5113824139","display_name":"Weaam Alkhaldi","orcid":null},"institutions":[{"id":"https://openalex.org/I31512782","display_name":"Technische Universit\u00e4t Darmstadt","ror":"https://ror.org/05n911h24","country_code":"DE","type":"education","lineage":["https://openalex.org/I31512782"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"W. Alkhaldi","raw_affiliation_strings":["Institute of Telecommunications, Technical University of Darmstadt, 64283 Darmstadt, Germany. alkhaldi@spg.tu-darmstadt.de"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Telecommunications, Technical University of Darmstadt, 64283 Darmstadt, Germany. alkhaldi@spg.tu-darmstadt.de","institution_ids":["https://openalex.org/I31512782"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5007483245","display_name":"Robert Iskander","orcid":null},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"D.R. Iskander","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5001328562","display_name":"Abdelhak M. Zoubir","orcid":"https://orcid.org/0000-0002-4409-7743"},"institutions":[{"id":"https://openalex.org/I31512782","display_name":"Technische Universit\u00e4t Darmstadt","ror":"https://ror.org/05n911h24","country_code":"DE","type":"education","lineage":["https://openalex.org/I31512782"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"A.M. Zoubir","raw_affiliation_strings":["Signal Processing Group, Institute of Telecommunications, Technical University of Darmstadt, Darmstadt, Germany"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Signal Processing Group, Institute of Telecommunications, Technical University of Darmstadt, Darmstadt, Germany","institution_ids":["https://openalex.org/I31512782"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5074839699","display_name":"Michael J. Collins","orcid":"https://orcid.org/0000-0001-5226-5498"},"institutions":[{"id":"https://openalex.org/I160993911","display_name":"Queensland University of Technology","ror":"https://ror.org/03pnv4752","country_code":"AU","type":"education","lineage":["https://openalex.org/I160993911"]}],"countries":["AU"],"is_corresponding":false,"raw_author_name":"M.J. Collins","raw_affiliation_strings":["Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, QLD, Australia"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, QLD, Australia","institution_ids":["https://openalex.org/I160993911"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":4,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":1,"citation_normalized_percentile":{"value":0.07803733,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":94},"biblio":{"volume":"56","issue":"3","first_page":"800","last_page":"809"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10563","display_name":"Corneal surgery and disorders","score":0.9993000030517578,"subfield":{"id":"https://openalex.org/subfields/2741","display_name":"Radiology, Nuclear Medicine and Imaging"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T10563","display_name":"Corneal surgery and disorders","score":0.9993000030517578,"subfield":{"id":"https://openalex.org/subfields/2741","display_name":"Radiology, Nuclear Medicine and Imaging"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10381","display_name":"Ophthalmology and Visual Impairment Studies","score":0.9934999942779541,"subfield":{"id":"https://openalex.org/subfields/2713","display_name":"Epidemiology"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10997","display_name":"Ocular Surface and Contact Lens","score":0.9932000041007996,"subfield":{"id":"https://openalex.org/subfields/2739","display_name":"Public Health, Environmental and Occupational Health"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/corneal-topography","display_name":"Corneal topography","score":0.7243695855140686},{"id":"https://openalex.org/keywords/palpebral-fissure","display_name":"Palpebral fissure","score":0.5852226614952087},{"id":"https://openalex.org/keywords/optics","display_name":"Optics","score":0.536713182926178},{"id":"https://openalex.org/keywords/cornea","display_name":"Cornea","score":0.4942484200000763},{"id":"https://openalex.org/keywords/eccentricity","display_name":"Eccentricity (behavior)","score":0.44079458713531494},{"id":"https://openalex.org/keywords/rotation","display_name":"Rotation (mathematics)","score":0.43510299921035767},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4227745831012726},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.374880313873291},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.35473841428756714},{"id":"https://openalex.org/keywords/geology","display_name":"Geology","score":0.3238295316696167},{"id":"https://openalex.org/keywords/materials-science","display_name":"Materials science","score":0.3227142095565796},{"id":"https://openalex.org/keywords/ophthalmology","display_name":"Ophthalmology","score":0.31988322734832764},{"id":"https://openalex.org/keywords/medicine","display_name":"Medicine","score":0.18817138671875},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.1745700240135193}],"concepts":[{"id":"https://openalex.org/C2781053140","wikidata":"https://www.wikidata.org/wiki/Q3501232","display_name":"Corneal topography","level":3,"score":0.7243695855140686},{"id":"https://openalex.org/C42558546","wikidata":"https://www.wikidata.org/wiki/Q7128693","display_name":"Palpebral fissure","level":2,"score":0.5852226614952087},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.536713182926178},{"id":"https://openalex.org/C2776882836","wikidata":"https://www.wikidata.org/wiki/Q168291","display_name":"Cornea","level":2,"score":0.4942484200000763},{"id":"https://openalex.org/C190538878","wikidata":"https://www.wikidata.org/wiki/Q50013","display_name":"Eccentricity (behavior)","level":2,"score":0.44079458713531494},{"id":"https://openalex.org/C74050887","wikidata":"https://www.wikidata.org/wiki/Q848368","display_name":"Rotation (mathematics)","level":2,"score":0.43510299921035767},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4227745831012726},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.374880313873291},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.35473841428756714},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.3238295316696167},{"id":"https://openalex.org/C192562407","wikidata":"https://www.wikidata.org/wiki/Q228736","display_name":"Materials science","level":0,"score":0.3227142095565796},{"id":"https://openalex.org/C118487528","wikidata":"https://www.wikidata.org/wiki/Q161437","display_name":"Ophthalmology","level":1,"score":0.31988322734832764},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.18817138671875},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.1745700240135193},{"id":"https://openalex.org/C199539241","wikidata":"https://www.wikidata.org/wiki/Q7748","display_name":"Law","level":1,"score":0.0},{"id":"https://openalex.org/C17744445","wikidata":"https://www.wikidata.org/wiki/Q36442","display_name":"Political science","level":0,"score":0.0}],"mesh":[{"descriptor_ui":"D000465","descriptor_name":"Algorithms","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D000465","descriptor_name":"Algorithms","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D000465","descriptor_name":"Algorithms","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D003315","descriptor_name":"Cornea","qualifier_ui":"Q000033","qualifier_name":"anatomy & histology","is_major_topic":false},{"descriptor_ui":"D003315","descriptor_name":"Cornea","qualifier_ui":"Q000033","qualifier_name":"anatomy & histology","is_major_topic":false},{"descriptor_ui":"D003315","descriptor_name":"Cornea","qualifier_ui":"Q000033","qualifier_name":"anatomy & histology","is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D007091","descriptor_name":"Image Processing, Computer-Assisted","qualifier_ui":"Q000379","qualifier_name":"methods","is_major_topic":false},{"descriptor_ui":"D007091","descriptor_name":"Image Processing, Computer-Assisted","qualifier_ui":"Q000379","qualifier_name":"methods","is_major_topic":false},{"descriptor_ui":"D007091","descriptor_name":"Image Processing, Computer-Assisted","qualifier_ui":"Q000379","qualifier_name":"methods","is_major_topic":false},{"descriptor_ui":"D013666","descriptor_name":"Tears","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D013666","descriptor_name":"Tears","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D013666","descriptor_name":"Tears","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D015203","descriptor_name":"Reproducibility of Results","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D015203","descriptor_name":"Reproducibility of Results","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D015203","descriptor_name":"Reproducibility of Results","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D016477","descriptor_name":"Artifacts","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D016477","descriptor_name":"Artifacts","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D016477","descriptor_name":"Artifacts","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D019781","descriptor_name":"Corneal Topography","qualifier_ui":"Q000379","qualifier_name":"methods","is_major_topic":false},{"descriptor_ui":"D019781","descriptor_name":"Corneal Topography","qualifier_ui":"Q000379","qualifier_name":"methods","is_major_topic":false},{"descriptor_ui":"D019781","descriptor_name":"Corneal Topography","qualifier_ui":"Q000379","qualifier_name":"methods","is_major_topic":false}],"locations_count":4,"locations":[{"id":"doi:10.1109/tbme.2008.2005997","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tbme.2008.2005997","pdf_url":null,"source":{"id":"https://openalex.org/S5240358","display_name":"IEEE Transactions on Biomedical Engineering","issn_l":"0018-9294","issn":["0018-9294","1558-2531"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Biomedical Engineering","raw_type":"journal-article"},{"id":"pmid:19389686","is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/19389686","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE transactions on bio-medical engineering","raw_type":null},{"id":"pmh:oai:tubiblio.ulb.tu-darmstadt.de:66549","is_oa":false,"landing_page_url":"http://tubiblio.ulb.tu-darmstadt.de/66549/","pdf_url":null,"source":{"id":"https://openalex.org/S4377196390","display_name":"TUbilio (Technical University of Darmstadt)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I31512782","host_organization_name":"Technische Universit\u00e4t Darmstadt","host_organization_lineage":["https://openalex.org/I31512782"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Artikel"},{"id":"mag:1517283604","is_oa":false,"landing_page_url":"https://eprints.qut.edu.au/30332/","pdf_url":null,"source":{"id":"https://openalex.org/S4306510308","display_name":"Faculty of Health; Institute of Health and Biomedical Innovation","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":null,"raw_source_name":"Faculty of Health; Institute of Health and Biomedical Innovation","raw_type":null}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.8100000023841858,"id":"https://metadata.un.org/sdg/1","display_name":"No poverty"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":26,"referenced_works":["https://openalex.org/W1567669715","https://openalex.org/W1966308680","https://openalex.org/W1967929598","https://openalex.org/W1979685852","https://openalex.org/W1994762785","https://openalex.org/W2008061494","https://openalex.org/W2014502386","https://openalex.org/W2041302104","https://openalex.org/W2060327559","https://openalex.org/W2078255538","https://openalex.org/W2085002106","https://openalex.org/W2089025065","https://openalex.org/W2089958875","https://openalex.org/W2091332050","https://openalex.org/W2110221351","https://openalex.org/W2116060068","https://openalex.org/W2117499965","https://openalex.org/W2136522799","https://openalex.org/W2144391563","https://openalex.org/W2153504150","https://openalex.org/W2157840858","https://openalex.org/W2160544483","https://openalex.org/W2168652187","https://openalex.org/W2180133750","https://openalex.org/W2233404270","https://openalex.org/W6635174422"],"related_works":["https://openalex.org/W2164211415","https://openalex.org/W1505804864","https://openalex.org/W1495827308","https://openalex.org/W2272095227","https://openalex.org/W2576156185","https://openalex.org/W2026447406","https://openalex.org/W192711054","https://openalex.org/W2180133750","https://openalex.org/W1488677593","https://openalex.org/W2769045630","https://openalex.org/W856433121","https://openalex.org/W2343925586","https://openalex.org/W2397306911","https://openalex.org/W2060441271","https://openalex.org/W1887632552","https://openalex.org/W2933211898","https://openalex.org/W2087935625","https://openalex.org/W2806913274","https://openalex.org/W3210476263","https://openalex.org/W2102357104"],"abstract_inverted_index":{"Corneal":[0],"topography":[1,71,110],"estimation":[2,111],"that":[3,117,140],"is":[4],"based":[5],"on":[6,12],"the":[7,58,96,107,141,144,163],"Placido":[8,64],"disk":[9,65],"principle":[10],"relies":[11],"good":[13],"quality":[14],"of":[15,50,62,98,133,143,151],"precorneal":[16],"tear":[17,77],"film":[18,78],"and":[19,46,89,123,136],"sufficiently":[20],"wide":[21],"eyelid":[22],"(palpebral)":[23],"aperture":[24],"to":[25,56,67,158],"avoid":[26],"reflections":[27],"from":[28,131],"eyelashes.":[29],"However,":[30],"in":[31,40,73,83,95,106,148,155,162],"practice,":[32],"these":[33],"conditions":[34],"are":[35],"not":[36],"always":[37],"fulfilled":[38],"resulting":[39],"missing":[41],"regions,":[42],"smaller":[43],"corneal":[44,51,70,152],"coverage,":[45],"subsequently":[47],"poorer":[48],"estimates":[49,72,150],"topography.":[52],"Our":[53],"aim":[54],"was":[55,102],"enhance":[57],"standard":[59],"operating":[60],"range":[61],"a":[63,119,124,159,172],"videokeratoscope":[66,171],"obtain":[68],"reliable":[69],"patients":[74],"with":[75,86,90],"poor":[76],"quality,":[79],"such":[80,168],"as":[81,94],"encountered":[82],"those":[84],"diagnosed":[85],"dry":[87],"eye,":[88],"narrower":[91],"palpebral":[92],"apertures":[93],"case":[97],"Asian":[99],"subjects.":[100],"This":[101],"achieved":[103],"by":[104],"incorporating":[105],"instrument's":[108],"own":[109],"algorithm":[112],"an":[113,169],"image":[114],"processing":[115],"technique":[116,146],"comprises":[118],"polar-domain":[120],"adaptive":[121],"filter":[122],"morphological":[125],"closing":[126],"operator.":[127],"The":[128],"experimental":[129],"results":[130,147],"measurements":[132],"test":[134],"surfaces":[135],"real":[137],"corneas":[138],"showed":[139],"incorporation":[142],"proposed":[145],"better":[149,173],"topography,":[153],"and,":[154],"many":[156],"cases,":[157],"significant":[160],"increase":[161],"estimated":[164],"coverage":[165],"area":[166],"making":[167],"enhanced":[170],"tool":[174],"for":[175],"clinicians.":[176]},"counts_by_year":[{"year":2015,"cited_by_count":1}],"updated_date":"2026-06-11T09:08:48.828518","created_date":"2025-10-10T00:00:00"}