{"id":"https://openalex.org/W236254921","doi":"https://doi.org/10.1109/tip.2015.2432713","title":"Single Image Superresolution via Directional Group Sparsity and Directional Features","display_name":"Single Image Superresolution via Directional Group Sparsity and Directional Features","publication_year":2015,"publication_date":"2015-05-13","ids":{"openalex":"https://openalex.org/W236254921","doi":"https://doi.org/10.1109/tip.2015.2432713","mag":"236254921","pmid":"https://pubmed.ncbi.nlm.nih.gov/25974939"},"language":"en","primary_location":{"id":"doi:10.1109/tip.2015.2432713","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tip.2015.2432713","pdf_url":null,"source":{"id":"https://openalex.org/S4210173141","display_name":"IEEE Transactions on Image Processing","issn_l":"1057-7149","issn":["1057-7149","1941-0042"],"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 Image Processing","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/A5100668600","display_name":"Xiaoyan Li","orcid":"https://orcid.org/0000-0001-8285-0743"},"institutions":[{"id":"https://openalex.org/I114017466","display_name":"University of Technology Sydney","ror":"https://ror.org/03f0f6041","country_code":"AU","type":"education","lineage":["https://openalex.org/I114017466"]},{"id":"https://openalex.org/I4210096034","display_name":"Centre for Quantum Computation and Communication Technology","ror":"https://ror.org/00rnbty21","country_code":"AU","type":"facility","lineage":["https://openalex.org/I1337719021","https://openalex.org/I165143802","https://openalex.org/I2801453606","https://openalex.org/I4210096034","https://openalex.org/I4210132349"]},{"id":"https://openalex.org/I4800084","display_name":"Southwest Jiaotong University","ror":"https://ror.org/00hn7w693","country_code":"CN","type":"education","lineage":["https://openalex.org/I4800084"]}],"countries":["AU","CN"],"is_corresponding":false,"raw_author_name":"Xiaoyan Li","raw_affiliation_strings":["Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology, University of Technology, Sydney, 81 Broadway Street, Ultimo, NSW, Australia","Sichuan Key Laboratory of Signal and Information Processing, Southwest Jiaotong University, Chengdu, China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology, University of Technology, Sydney, 81 Broadway Street, Ultimo, NSW, Australia","institution_ids":["https://openalex.org/I4210096034","https://openalex.org/I114017466"]},{"raw_affiliation_string":"Sichuan Key Laboratory of Signal and Information Processing, Southwest Jiaotong University, Chengdu, China","institution_ids":["https://openalex.org/I4800084"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5049403375","display_name":"Hongjie He","orcid":"https://orcid.org/0000-0003-3839-5821"},"institutions":[{"id":"https://openalex.org/I4800084","display_name":"Southwest Jiaotong University","ror":"https://ror.org/00hn7w693","country_code":"CN","type":"education","lineage":["https://openalex.org/I4800084"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Hongjie He","raw_affiliation_strings":["Sichuan Key Laboratory of Signal and Information Processing, Southwest Jiaotong University, Chengdu, China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Sichuan Key Laboratory of Signal and Information Processing, Southwest Jiaotong University, Chengdu, China","institution_ids":["https://openalex.org/I4800084"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5101848673","display_name":"Ruxin Wang","orcid":"https://orcid.org/0000-0002-2730-9409"},"institutions":[{"id":"https://openalex.org/I114017466","display_name":"University of Technology Sydney","ror":"https://ror.org/03f0f6041","country_code":"AU","type":"education","lineage":["https://openalex.org/I114017466"]},{"id":"https://openalex.org/I4210096034","display_name":"Centre for Quantum Computation and Communication Technology","ror":"https://ror.org/00rnbty21","country_code":"AU","type":"facility","lineage":["https://openalex.org/I1337719021","https://openalex.org/I165143802","https://openalex.org/I2801453606","https://openalex.org/I4210096034","https://openalex.org/I4210132349"]}],"countries":["AU"],"is_corresponding":false,"raw_author_name":"Ruxin Wang","raw_affiliation_strings":["Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology, University of Technology, Sydney, 81 Broadway Street, Ultimo, NSW, Australia"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology, University of Technology, Sydney, 81 Broadway Street, Ultimo, NSW, Australia","institution_ids":["https://openalex.org/I4210096034","https://openalex.org/I114017466"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5074103823","display_name":"Dacheng Tao","orcid":"https://orcid.org/0000-0001-7225-5449"},"institutions":[{"id":"https://openalex.org/I114017466","display_name":"University of Technology Sydney","ror":"https://ror.org/03f0f6041","country_code":"AU","type":"education","lineage":["https://openalex.org/I114017466"]},{"id":"https://openalex.org/I4210096034","display_name":"Centre for Quantum Computation and Communication Technology","ror":"https://ror.org/00rnbty21","country_code":"AU","type":"facility","lineage":["https://openalex.org/I1337719021","https://openalex.org/I165143802","https://openalex.org/I2801453606","https://openalex.org/I4210096034","https://openalex.org/I4210132349"]}],"countries":["AU"],"is_corresponding":false,"raw_author_name":"Dacheng Tao","raw_affiliation_strings":["Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology, University of Technology, Sydney, 81 Broadway Street, Ultimo, NSW, Australia"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology, University of Technology, Sydney, 81 Broadway Street, Ultimo, NSW, Australia","institution_ids":["https://openalex.org/I4210096034","https://openalex.org/I114017466"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":4,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":5.242,"has_fulltext":false,"cited_by_count":57,"citation_normalized_percentile":{"value":0.96966266,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":90,"max":100},"biblio":{"volume":"24","issue":"9","first_page":"2874","last_page":"2888"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11105","display_name":"Advanced Image Processing Techniques","score":0.9998999834060669,"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"}},"topics":[{"id":"https://openalex.org/T11105","display_name":"Advanced Image Processing Techniques","score":0.9998999834060669,"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/T10688","display_name":"Image and Signal Denoising Methods","score":0.9987000226974487,"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/T13114","display_name":"Image Processing Techniques and Applications","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/2214","display_name":"Media Technology"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.5879846811294556},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5255997180938721},{"id":"https://openalex.org/keywords/regularization","display_name":"Regularization (linguistics)","score":0.5211874842643738},{"id":"https://openalex.org/keywords/pattern-recognition","display_name":"Pattern recognition (psychology)","score":0.5013179779052734},{"id":"https://openalex.org/keywords/iterative-reconstruction","display_name":"Iterative reconstruction","score":0.4979362487792969},{"id":"https://openalex.org/keywords/image-resolution","display_name":"Image resolution","score":0.4940264821052551},{"id":"https://openalex.org/keywords/image-restoration","display_name":"Image restoration","score":0.474045991897583},{"id":"https://openalex.org/keywords/pixel","display_name":"Pixel","score":0.47326233983039856},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.4010162055492401},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.3625686466693878},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.3539372384548187},{"id":"https://openalex.org/keywords/image-processing","display_name":"Image processing","score":0.33095353841781616},{"id":"https://openalex.org/keywords/image","display_name":"Image (mathematics)","score":0.30798453092575073}],"concepts":[{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.5879846811294556},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5255997180938721},{"id":"https://openalex.org/C2776135515","wikidata":"https://www.wikidata.org/wiki/Q17143721","display_name":"Regularization (linguistics)","level":2,"score":0.5211874842643738},{"id":"https://openalex.org/C153180895","wikidata":"https://www.wikidata.org/wiki/Q7148389","display_name":"Pattern recognition (psychology)","level":2,"score":0.5013179779052734},{"id":"https://openalex.org/C141379421","wikidata":"https://www.wikidata.org/wiki/Q6094427","display_name":"Iterative reconstruction","level":2,"score":0.4979362487792969},{"id":"https://openalex.org/C205372480","wikidata":"https://www.wikidata.org/wiki/Q210521","display_name":"Image resolution","level":2,"score":0.4940264821052551},{"id":"https://openalex.org/C106430172","wikidata":"https://www.wikidata.org/wiki/Q6002272","display_name":"Image restoration","level":4,"score":0.474045991897583},{"id":"https://openalex.org/C160633673","wikidata":"https://www.wikidata.org/wiki/Q355198","display_name":"Pixel","level":2,"score":0.47326233983039856},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.4010162055492401},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.3625686466693878},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.3539372384548187},{"id":"https://openalex.org/C9417928","wikidata":"https://www.wikidata.org/wiki/Q1070689","display_name":"Image processing","level":3,"score":0.33095353841781616},{"id":"https://openalex.org/C115961682","wikidata":"https://www.wikidata.org/wiki/Q860623","display_name":"Image (mathematics)","level":2,"score":0.30798453092575073}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1109/tip.2015.2432713","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tip.2015.2432713","pdf_url":null,"source":{"id":"https://openalex.org/S4210173141","display_name":"IEEE Transactions on Image Processing","issn_l":"1057-7149","issn":["1057-7149","1941-0042"],"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 Image Processing","raw_type":"journal-article"},{"id":"pmid:25974939","is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/25974939","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 image processing : a publication of the IEEE Signal Processing Society","raw_type":null}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Affordable and clean energy","id":"https://metadata.un.org/sdg/7","score":0.7799999713897705}],"awards":[{"id":"https://openalex.org/G1379478949","display_name":"\u9762\u5411\u51ed\u8bc1\u7684\u8ba1\u7b97\u673a\u751f\u6210\u6587\u672c-\u6570\u636e\u56fe\u50cf\u4e3b\u52a8\u53d6\u8bc1\u65b9\u6cd5\u7814\u7a76","funder_award_id":"61373180","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"},{"id":"https://openalex.org/G4669743624","display_name":"\u57fa\u4e8e\u7834\u635f\u5206\u7c7b\u7684\u897f\u85cf\u58c1\u753b\u56fe\u50cf\u4fee\u590d\u5173\u952e\u6280\u672f\u7814\u7a76","funder_award_id":"61461047","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"}],"funders":[{"id":"https://openalex.org/F4320321001","display_name":"National Natural Science Foundation of China","ror":"https://ror.org/01h0zpd94"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":52,"referenced_works":["https://openalex.org/W7682646","https://openalex.org/W70975097","https://openalex.org/W131155259","https://openalex.org/W203514165","https://openalex.org/W204290405","https://openalex.org/W1485280399","https://openalex.org/W1972449885","https://openalex.org/W1981199328","https://openalex.org/W1992127150","https://openalex.org/W1992408872","https://openalex.org/W1994380990","https://openalex.org/W2006262236","https://openalex.org/W2017814585","https://openalex.org/W2017855764","https://openalex.org/W2028587221","https://openalex.org/W2029684123","https://openalex.org/W2035299679","https://openalex.org/W2040708213","https://openalex.org/W2042860556","https://openalex.org/W2049237558","https://openalex.org/W2059673930","https://openalex.org/W2067042811","https://openalex.org/W2070840516","https://openalex.org/W2075880488","https://openalex.org/W2087436818","https://openalex.org/W2097074225","https://openalex.org/W2097200430","https://openalex.org/W2097703723","https://openalex.org/W2103047572","https://openalex.org/W2103844245","https://openalex.org/W2105610271","https://openalex.org/W2117865218","https://openalex.org/W2119058682","https://openalex.org/W2121058967","https://openalex.org/W2121927366","https://openalex.org/W2123613719","https://openalex.org/W2124378283","https://openalex.org/W2130638881","https://openalex.org/W2137290314","https://openalex.org/W2142884912","https://openalex.org/W2149669120","https://openalex.org/W2150081556","https://openalex.org/W2151690846","https://openalex.org/W2152404931","https://openalex.org/W2159209388","https://openalex.org/W2160558632","https://openalex.org/W2167191464","https://openalex.org/W2172128189","https://openalex.org/W2203322007","https://openalex.org/W3104720471","https://openalex.org/W6683781035","https://openalex.org/W6687709076"],"related_works":["https://openalex.org/W2357322570","https://openalex.org/W90581812","https://openalex.org/W2997591215","https://openalex.org/W2227541280","https://openalex.org/W2038232617","https://openalex.org/W2974904990","https://openalex.org/W2029783634","https://openalex.org/W2006843870","https://openalex.org/W1602455006","https://openalex.org/W2537408670"],"abstract_inverted_index":{"Single":[0],"image":[1,65,101],"superresolution":[2],"(SR)":[3],"aims":[4],"to":[5,35,123,174],"construct":[6],"a":[7,11,52,93,153,160,199],"high-resolution":[8],"version":[9],"from":[10],"single":[12],"low-resolution":[13],"(LR)":[14],"image.":[15,30],"The":[16,75,207],"SR":[17,54,77,187,235],"reconstruction":[18,45,195,236],"is":[19,33,79,142],"challenging":[20],"because":[21],"of":[22,63,86,96,110,115,189,201,215],"the":[23,27,44,59,64,68,87,107,120,147,180,186,229,238],"missing":[24],"details":[25],"in":[26,71,92,149,213],"given":[28],"LR":[29],"Thus,":[31],"it":[32],"critical":[34],"explore":[36],"and":[37,67,98,134,169,210,224],"exploit":[38],"effective":[39],"prior":[40],"knowledge":[41],"for":[42,131,203],"boosting":[43],"performance.":[46],"In":[47,113,158],"this":[48],"paper,":[49],"we":[50,118,184],"propose":[51],"novel":[53],"method":[55],"by":[56,106,197],"exploiting":[57],"both":[58],"directional":[60,69,125,161,170],"group":[61,155],"sparsity":[62,156],"gradients":[66,148],"features":[70,126],"similarity":[72],"weight":[73,135],"estimation.":[74,136],"proposed":[76,230],"approach":[78,231],"based":[80],"on":[81],"two":[82],"observations:":[83],"1)":[84],"most":[85],"sharp":[88],"edges":[89],"are":[90,128],"oriented":[91],"limited":[94],"number":[95],"directions":[97],"2)":[99],"an":[100,190],"pixel":[102,167],"can":[103],"be":[104],"estimated":[105],"weighted":[108],"averaging":[109],"its":[111],"neighbors.":[112],"consideration":[114],"these":[116],"observations,":[117],"apply":[119],"curvelet":[121],"transform":[122],"extract":[124],"which":[127,144],"then":[129],"used":[130],"region":[132],"selection":[133],"A":[137],"combined":[138],"total":[139],"variation":[140],"regularizer":[141],"presented":[143],"assumes":[145],"that":[146,228],"natural":[150],"images":[151],"have":[152],"straightforward":[154],"structure.":[157],"addition,":[159],"nonlocal":[162],"means":[163],"regularization":[164,182],"term":[165],"takes":[166],"values":[168],"information":[171,221],"into":[172],"account":[173],"suppress":[175],"unwanted":[176],"artifacts.":[177],"By":[178],"assembling":[179],"designed":[181],"terms,":[183],"solve":[185],"problem":[188],"energy":[191],"function":[192],"with":[193],"minimal":[194],"error":[196],"applying":[198],"framework":[200],"templates":[202],"first-order":[204],"conic":[205],"solvers.":[206],"thorough":[208],"quantitative":[209],"qualitative":[211],"results":[212],"terms":[214],"peak":[216],"signal-to-noise":[217],"ratio,":[218],"structural":[219],"similarity,":[220],"fidelity":[222],"criterion,":[223],"preference":[225],"matrix":[226],"demonstrate":[227],"achieves":[232],"higher":[233],"quality":[234],"than":[237],"state-of-the-art":[239],"algorithms.":[240]},"counts_by_year":[{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":4},{"year":2021,"cited_by_count":4},{"year":2020,"cited_by_count":8},{"year":2019,"cited_by_count":11},{"year":2018,"cited_by_count":4},{"year":2017,"cited_by_count":9},{"year":2016,"cited_by_count":14},{"year":2015,"cited_by_count":1}],"updated_date":"2026-06-11T09:08:48.828518","created_date":"2025-10-10T00:00:00"}
