License plate accurate positioning method and device in free scene
The invention discloses a license plate accurate positioning method and device in a free scene. The method comprises the steps: carrying out connected domain analysis of a preset license plate image,reserving a marked connected domain meeting a preset contour condition, recording boundary points of...
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| creator | LAI ZHENXIANG DING LEI YANG MINGYUE DENG JIEHANG JIANG ZHIHAO GU GUOSHENG LI YAPING |
| description | The invention discloses a license plate accurate positioning method and device in a free scene. The method comprises the steps: carrying out connected domain analysis of a preset license plate image,reserving a marked connected domain meeting a preset contour condition, recording boundary points of the connected domain, and obtaining an upper boundary point set and a lower boundary point set; performing straight line fitting on the upper boundary point set and the lower boundary point set by adopting a preset least square method to obtain an upper boundary line segment and a lower boundary line segment; calculating boundary point coordinates of four corners of an area interception frame according to the upper boundary line segment and the lower boundary line segment; intercepting a license plate area image of the expanded original license plate image through an area interception frame; and performing coordinate fitting on the left and right boundaries of the license plate area image by adopting a preset CNN m |
| format | Patent |
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The method comprises the steps: carrying out connected domain analysis of a preset license plate image,reserving a marked connected domain meeting a preset contour condition, recording boundary points of the connected domain, and obtaining an upper boundary point set and a lower boundary point set; performing straight line fitting on the upper boundary point set and the lower boundary point set by adopting a preset least square method to obtain an upper boundary line segment and a lower boundary line segment; calculating boundary point coordinates of four corners of an area interception frame according to the upper boundary line segment and the lower boundary line segment; intercepting a license plate area image of the expanded original license plate image through an area interception frame; and performing coordinate fitting on the left and right boundaries of the license plate area image by adopting a preset CNN m</description><language>chi ; eng</language><subject>CALCULATING ; COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS ; COMPUTING ; COUNTING ; HANDLING RECORD CARRIERS ; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ; PHYSICS ; PRESENTATION OF DATA ; RECOGNITION OF DATA ; RECORD CARRIERS</subject><creationdate>2020</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20201208&DB=EPODOC&CC=CN&NR=112052859A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,778,883,25547,76298</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20201208&DB=EPODOC&CC=CN&NR=112052859A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>LAI ZHENXIANG</creatorcontrib><creatorcontrib>DING LEI</creatorcontrib><creatorcontrib>YANG MINGYUE</creatorcontrib><creatorcontrib>DENG JIEHANG</creatorcontrib><creatorcontrib>JIANG ZHIHAO</creatorcontrib><creatorcontrib>GU GUOSHENG</creatorcontrib><creatorcontrib>LI YAPING</creatorcontrib><title>License plate accurate positioning method and device in free scene</title><description>The invention discloses a license plate accurate positioning method and device in a free scene. 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The method comprises the steps: carrying out connected domain analysis of a preset license plate image,reserving a marked connected domain meeting a preset contour condition, recording boundary points of the connected domain, and obtaining an upper boundary point set and a lower boundary point set; performing straight line fitting on the upper boundary point set and the lower boundary point set by adopting a preset least square method to obtain an upper boundary line segment and a lower boundary line segment; calculating boundary point coordinates of four corners of an area interception frame according to the upper boundary line segment and the lower boundary line segment; intercepting a license plate area image of the expanded original license plate image through an area interception frame; and performing coordinate fitting on the left and right boundaries of the license plate area image by adopting a preset CNN m</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CALCULATING COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS COMPUTING COUNTING HANDLING RECORD CARRIERS IMAGE DATA PROCESSING OR GENERATION, IN GENERAL PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS |
| title | License plate accurate positioning method and device in free scene |
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