{"id":"https://openalex.org/W2164575144","doi":"https://doi.org/10.1109/cvprw.2010.5543148","title":"Sparse representations for facial expressions recognition via l&lt;inf&gt;1&lt;/inf&gt; optimization","display_name":"Sparse representations for facial expressions recognition via l&lt;inf&gt;1&lt;/inf&gt; optimization","publication_year":2010,"publication_date":"2010-06-01","ids":{"openalex":"https://openalex.org/W2164575144","doi":"https://doi.org/10.1109/cvprw.2010.5543148","mag":"2164575144"},"language":"en","primary_location":{"id":"doi:10.1109/cvprw.2010.5543148","is_oa":false,"landing_page_url":"https://doi.org/10.1109/cvprw.2010.5543148","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Workshops","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"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/A5080553022","display_name":"Stefanos Zafeiriou","orcid":"https://orcid.org/0000-0002-5222-1740"},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Stefanos Zafeiriou","raw_affiliation_strings":["Department of Electrical and Electronic Engineering, Imperial College London, UK"],"affiliations":[{"raw_affiliation_string":"Department of Electrical and Electronic Engineering, Imperial College London, UK","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5103426811","display_name":"Maria Petrou","orcid":null},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Maria Petrou","raw_affiliation_strings":["Department of Electrical and Electronic Engineering, Imperial College London, UK"],"affiliations":[{"raw_affiliation_string":"Department of Electrical and Electronic Engineering, Imperial College London, UK","institution_ids":["https://openalex.org/I47508984"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5080553022"],"corresponding_institution_ids":["https://openalex.org/I47508984"],"apc_list":null,"apc_paid":null,"fwci":6.4371,"has_fulltext":false,"cited_by_count":72,"citation_normalized_percentile":{"value":0.97228947,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":99},"biblio":{"volume":null,"issue":null,"first_page":"32","last_page":"39"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10500","display_name":"Sparse and Compressive Sensing Techniques","score":0.9995999932289124,"subfield":{"id":"https://openalex.org/subfields/2206","display_name":"Computational Mechanics"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10500","display_name":"Sparse and Compressive Sensing Techniques","score":0.9995999932289124,"subfield":{"id":"https://openalex.org/subfields/2206","display_name":"Computational Mechanics"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10057","display_name":"Face and Expression Recognition","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/1707","display_name":"Computer Vision and Pattern Recognition"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11447","display_name":"Blind Source Separation Techniques","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/robustness","display_name":"Robustness (evolution)","score":0.7113693952560425},{"id":"https://openalex.org/keywords/facial-expression","display_name":"Facial expression","score":0.644182026386261},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6009407639503479},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.5939434766769409},{"id":"https://openalex.org/keywords/pattern-recognition","display_name":"Pattern recognition (psychology)","score":0.5635350942611694},{"id":"https://openalex.org/keywords/feature-extraction","display_name":"Feature extraction","score":0.49235236644744873},{"id":"https://openalex.org/keywords/sparse-approximation","display_name":"Sparse approximation","score":0.4900854825973511},{"id":"https://openalex.org/keywords/subtraction","display_name":"Subtraction","score":0.4871468245983124},{"id":"https://openalex.org/keywords/facial-recognition-system","display_name":"Facial recognition system","score":0.4859012961387634},{"id":"https://openalex.org/keywords/image","display_name":"Image (mathematics)","score":0.4256945252418518},{"id":"https://openalex.org/keywords/representation","display_name":"Representation (politics)","score":0.41443175077438354},{"id":"https://openalex.org/keywords/speech-recognition","display_name":"Speech recognition","score":0.38808298110961914},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.32681167125701904},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.26832315325737},{"id":"https://openalex.org/keywords/arithmetic","display_name":"Arithmetic","score":0.08846601843833923}],"concepts":[{"id":"https://openalex.org/C63479239","wikidata":"https://www.wikidata.org/wiki/Q7353546","display_name":"Robustness (evolution)","level":3,"score":0.7113693952560425},{"id":"https://openalex.org/C195704467","wikidata":"https://www.wikidata.org/wiki/Q327968","display_name":"Facial expression","level":2,"score":0.644182026386261},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6009407639503479},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.5939434766769409},{"id":"https://openalex.org/C153180895","wikidata":"https://www.wikidata.org/wiki/Q7148389","display_name":"Pattern recognition (psychology)","level":2,"score":0.5635350942611694},{"id":"https://openalex.org/C52622490","wikidata":"https://www.wikidata.org/wiki/Q1026626","display_name":"Feature extraction","level":2,"score":0.49235236644744873},{"id":"https://openalex.org/C124066611","wikidata":"https://www.wikidata.org/wiki/Q28684319","display_name":"Sparse approximation","level":2,"score":0.4900854825973511},{"id":"https://openalex.org/C68060419","wikidata":"https://www.wikidata.org/wiki/Q40754","display_name":"Subtraction","level":2,"score":0.4871468245983124},{"id":"https://openalex.org/C31510193","wikidata":"https://www.wikidata.org/wiki/Q1192553","display_name":"Facial recognition system","level":3,"score":0.4859012961387634},{"id":"https://openalex.org/C115961682","wikidata":"https://www.wikidata.org/wiki/Q860623","display_name":"Image (mathematics)","level":2,"score":0.4256945252418518},{"id":"https://openalex.org/C2776359362","wikidata":"https://www.wikidata.org/wiki/Q2145286","display_name":"Representation (politics)","level":3,"score":0.41443175077438354},{"id":"https://openalex.org/C28490314","wikidata":"https://www.wikidata.org/wiki/Q189436","display_name":"Speech recognition","level":1,"score":0.38808298110961914},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.32681167125701904},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.26832315325737},{"id":"https://openalex.org/C94375191","wikidata":"https://www.wikidata.org/wiki/Q11205","display_name":"Arithmetic","level":1,"score":0.08846601843833923},{"id":"https://openalex.org/C104317684","wikidata":"https://www.wikidata.org/wiki/Q7187","display_name":"Gene","level":2,"score":0.0},{"id":"https://openalex.org/C94625758","wikidata":"https://www.wikidata.org/wiki/Q7163","display_name":"Politics","level":2,"score":0.0},{"id":"https://openalex.org/C199539241","wikidata":"https://www.wikidata.org/wiki/Q7748","display_name":"Law","level":1,"score":0.0},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0},{"id":"https://openalex.org/C17744445","wikidata":"https://www.wikidata.org/wiki/Q36442","display_name":"Political science","level":0,"score":0.0},{"id":"https://openalex.org/C55493867","wikidata":"https://www.wikidata.org/wiki/Q7094","display_name":"Biochemistry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/cvprw.2010.5543148","is_oa":false,"landing_page_url":"https://doi.org/10.1109/cvprw.2010.5543148","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Workshops","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320334627","display_name":"Engineering and Physical Sciences Research Council","ror":"https://ror.org/0439y7842"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":26,"referenced_works":["https://openalex.org/W1532372219","https://openalex.org/W1548802052","https://openalex.org/W1565206031","https://openalex.org/W1902027874","https://openalex.org/W1976645892","https://openalex.org/W2053432263","https://openalex.org/W2073946125","https://openalex.org/W2074867602","https://openalex.org/W2080370442","https://openalex.org/W2129812935","https://openalex.org/W2135463994","https://openalex.org/W2144730066","https://openalex.org/W2145096794","https://openalex.org/W2145889472","https://openalex.org/W2149027517","https://openalex.org/W2156406284","https://openalex.org/W2156503193","https://openalex.org/W2156516654","https://openalex.org/W2296616510","https://openalex.org/W2532338691","https://openalex.org/W2533517198","https://openalex.org/W2803670972","https://openalex.org/W4205778870","https://openalex.org/W4238539449","https://openalex.org/W4241541897","https://openalex.org/W4250955649"],"related_works":["https://openalex.org/W2090049157","https://openalex.org/W2134771946","https://openalex.org/W1976835164","https://openalex.org/W189153436","https://openalex.org/W1580457994","https://openalex.org/W1973963881","https://openalex.org/W2769045829","https://openalex.org/W2379945344","https://openalex.org/W2912726270","https://openalex.org/W2985118265"],"abstract_inverted_index":{"In":[0],"this":[1],"paper,":[2],"the":[3,24,31,37,59,77,83,86,90,113,116,126,129],"principles":[4],"of":[5,62,73,85,102,115,128,135],"sparse":[6,94],"signal":[7],"representation":[8],"theory":[9],"are":[10,80],"explored":[11],"in":[12,30,41,132],"order":[13,42],"to":[14,43,65],"perform":[15],"facial":[16,45,95,104,120],"expressions":[17],"recognition":[18,33,47],"from":[19,82,89],"frontal":[20],"views.":[21],"Motivated":[22],"by":[23],"success":[25],"such":[26],"methods":[27,64],"have":[28],"demonstrated":[29],"face":[32],"problem,":[34],"we":[35],"formulate":[36],"feature":[38],"extraction":[39],"procedure":[40],"achieve":[44],"expression":[46,96],"as":[48],"an":[49],"l":[50],"<sub":[51],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[52],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">1</sub>":[53],"optimization":[54],"problem.":[55],"We":[56],"show":[57],"that":[58,79],"straightforward":[60],"application":[61],"these":[63],"expressive":[66,91,103],"images":[67,75,78],"imposes":[68],"certain":[69],"difficulties.":[70],"The":[71,100],"use":[72,101],"difference":[74],"(i.e.,":[76],"derived":[81],"subtraction":[84],"neutral":[87],"image":[88,121],"one)":[92],"for":[93,106],"representations":[97,118],"is":[98,109,123,137],"justified.":[99],"grids":[105],"similar":[107],"tasks":[108],"also":[110],"studied.":[111],"Finally,":[112],"robustness":[114],"proposed":[117,130],"under":[119],"occlusion":[122],"shown":[124],"and":[125],"efficacy":[127],"method":[131],"a":[133],"series":[134],"experiments":[136],"demonstrated.":[138]},"counts_by_year":[{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":2},{"year":2023,"cited_by_count":1},{"year":2021,"cited_by_count":2},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":12},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":7},{"year":2016,"cited_by_count":4},{"year":2015,"cited_by_count":9},{"year":2014,"cited_by_count":10},{"year":2013,"cited_by_count":9},{"year":2012,"cited_by_count":6}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
