{"id":773,"date":"2014-04-08T15:07:03","date_gmt":"2014-04-08T13:07:03","guid":{"rendered":"http:\/\/www.rcesystems.cz\/?p=773"},"modified":"2014-12-24T10:57:56","modified_gmt":"2014-12-24T09:57:56","slug":"automatic-number-plate-detection","status":"publish","type":"post","link":"https:\/\/www.rcesystems.cz\/cs\/articles\/automatic-number-plate-detection\/","title":{"rendered":"Detekce registra\u010dn\u00ed zna\u010dky v obraze"},"content":{"rendered":"

<\/span>Detekce registra\u010dn\u00ed zna\u010dky v obraze<\/strong><\/span><\/h6><\/div>\n

B\u011b\u017en\u00fdm po\u017eadavkem na inteligentn\u00ed parkovac\u00ed syst\u00e9my vybaven\u00e9 kamerov\u00fdm dohledov\u00fdm syst\u00e9mem b\u00fdv\u00e1 automatick\u00e1 detekce registra\u010dn\u00ed zna\u010dky vozidla, a to zejm\u00e9na z d\u016fvod\u016f vy\u0161\u0161\u00ed bezpe\u010dnosti, detekce podvodn\u00e9ho jedn\u00e1n\u00ed v p\u0159\u00edpad\u011b placen\u00fdch parkovi\u0161\u0165, soupisu po\u010dtu zaparkovan\u00fdch vozidel dle registra\u010dn\u00ed zna\u010dky apod. Tlak na co nejni\u017e\u0161\u00ed cenu v\u00fdsledn\u00e9ho \u0159e\u0161en\u00ed automatick\u00e9ho rozpozn\u00e1n\u00ed registra\u010dn\u00edch zna\u010dek vede k centralizovan\u00e9mu p\u0159\u00edstupu k tomuto probl\u00e9mu, tj. sd\u00edlen\u00ed v\u00fdpo\u010detn\u00edch a softwarov\u00fdch prost\u0159edk\u016f. Nev\u00fdhoda t\u00e9to architektury spo\u010d\u00edv\u00e1 v nutnosti zaji\u0161t\u011bn\u00ed dostate\u010dn\u00e9 konektivity pro p\u0159enos obrazov\u00e9 informace z d\u00edl\u010d\u00edch kamerov\u00fdch jednotek. Vzhledem k povaze sn\u00edman\u00e9 sc\u00e9ny je v\u0161ak mo\u017en\u00e9 datov\u00fd tok dramaticky sn\u00ed\u017eit p\u0159edzpracov\u00e1n\u00edm obrazu a filtrac\u00ed v\u0161ech sn\u00edmk\u016f, kter\u00e9 z\u00e1jmovou informaci neobsahuj\u00ed. Za t\u00edmto \u00fa\u010delem jsme pro jednoho z na\u0161ich z\u00e1kazn\u00edk\u016f vytvo\u0159ili vysoce optimalizovanou knihovnu pro platformu ARM Cortex A7, kter\u00e1 filtruje v\u0161echny sn\u00edmky na nich\u017e se registra\u010dn\u00ed zna\u010dka nevyskytuje.<\/p>\n

\"libANPD_res\"<\/p>\n

Knihovna libANPD je ur\u010dena pro aplikace pracuj\u00edc\u00ed v re\u00e1ln\u00e9m \u010dase \u2013 tzv. online zpracov\u00e1n\u00ed dat. Vstupn\u00ed sn\u00edmky mohou b\u00fdt jednokan\u00e1lov\u00e9 (\u0161edot\u00f3n), nebo t\u0159\u00edkan\u00e1lov\u00e9 (RGB). Sn\u00edmky jsou knihovn\u011b p\u0159ed\u00e1v\u00e1ny jednotliv\u011b ve stejn\u00e9m po\u0159ad\u00ed, v jak\u00e9m byly po\u0159\u00edzeny sn\u00edmac\u00edm za\u0159\u00edzen\u00edm. V\u00fdstupem pro ka\u017ed\u00fd sn\u00edmek je p\u0159\u00edznak ur\u010duj\u00edc\u00ed, zda na sn\u00edmku byla, respektive nebyla detekov\u00e1na registra\u010dn\u00ed zna\u010dka vozidla. Evaluace knihovny byla provedena na testovac\u00ed datov\u00e9 sad\u011b \u010d\u00edtaj\u00edc\u00ed 47 937 ru\u010dn\u011b anotovan\u00fdch sn\u00edmk\u016f o rozli\u0161en\u00ed 752×480 px. Testovac\u00ed datov\u00e1 sada obsahuje 2 427 pozitivn\u00edch sn\u00edmk\u016f, tj. sn\u00edmk\u016f na nich\u017e se nach\u00e1z\u00ed registra\u010dn\u00ed zna\u010dka vozidla, a 45 510 negativn\u00edch sn\u00edmk\u016f, tj. sn\u00edmk\u016f na nich\u017e se nenach\u00e1z\u00ed registra\u010dn\u00ed zna\u010dka vozidla. V\u00fdsledky evaluace detektoru na testovac\u00ed sad\u011b jsou tabelov\u00e1ny v n\u00e1sleduj\u00edc\u00edm obr\u00e1zku:<\/p>\n

\"libANPD_evaluation_v2\"

\n

Celkov\u00e1 redukce sn\u00edmk\u016f \u010din\u00ed 90.91%, p\u0159i\u010dem\u017e pravd\u011bpodobnost, \u017ee bude sn\u00edmek vyhodnocen spr\u00e1vn\u011b, je rovna hodnot\u011b 0.959. Detektor vyhodnotil v\u0161echny sn\u00edmky datov\u00e9 sady, kter\u00e9 obsahovaly registra\u010dn\u00ed zna\u010dku vozidla, korektn\u011b. K chybn\u00e9 detekci doch\u00e1zelo pouze u vzork\u016f, kter\u00e9 neobsahovaly registra\u010dn\u00ed zna\u010dku, a to s pravd\u011bpodobnost\u00ed 0.042. Toto chov\u00e1n\u00ed je vzhledem k \u00fa\u010delu nasazen\u00ed \u017e\u00e1douc\u00ed, nebo\u0165 filtr by m\u011bl odstra\u0148ovat z dal\u0161\u00edho procesu zpracov\u00e1n\u00ed pouze ty sn\u00edmky, u nich\u017e je vysok\u00e1 jistota, \u017ee registra\u010dn\u00ed zna\u010dku neobsahuj\u00ed.<\/p>\n<\/div>

<\/i>Detekce registra\u010dn\u00ed zna\u010dky vozidla v obraze<\/div>
<\/i>Zpracov\u00e1n\u00ed v re\u00e1ln\u00e9m \u010dase – a\u017e 40 FPS<\/div>
<\/i>Optimalizov\u00e1no pro ARM Cortex A7<\/div>
<\/i>Dostupn\u00e9 jako roz\u0161i\u0159ovac\u00ed modul pro Python<\/div>
<\/i>Pro barevn\u00e9 i \u0161edot\u00f3nov\u00e9 obr\u00e1zky<\/div>
<\/i>Mo\u017enost dal\u0161\u00ed kustomizace<\/div> <\/div>
<\/div>\n

V p\u0159\u00edpad\u011b z\u00e1jmu o tento produkt n\u00e1s pros\u00edm kontaktujte na info@rcesystems.cz<\/a>.<\/p>\n

<\/p>","protected":false},"excerpt":{"rendered":"

B\u011b\u017en\u00fdm po\u017eadavkem na inteligentn\u00ed parkovac\u00ed syst\u00e9my vybaven\u00e9 kamerov\u00fdm dohledov\u00fdm syst\u00e9mem b\u00fdv\u00e1 automatick\u00e1 detekce registra\u010dn\u00ed zna\u010dky vozidla, a to zejm\u00e9na z d\u016fvod\u016f vy\u0161\u0161\u00ed bezpe\u010dnosti, detekce podvodn\u00e9ho jedn\u00e1n\u00ed v p\u0159\u00edpad\u011b placen\u00fdch parkovi\u0161\u0165, soupisu po\u010dtu zaparkovan\u00fdch vozidel dle registra\u010dn\u00ed zna\u010dky apod. Tlak na co nejni\u017e\u0161\u00ed cenu v\u00fdsledn\u00e9ho \u0159e\u0161en\u00ed automatick\u00e9ho rozpozn\u00e1n\u00ed registra\u010dn\u00edch zna\u010dek vede k centralizovan\u00e9mu p\u0159\u00edstupu k tomuto […]<\/p>\n","protected":false},"author":2,"featured_media":831,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/posts\/773"}],"collection":[{"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/comments?post=773"}],"version-history":[{"count":49,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/posts\/773\/revisions"}],"predecessor-version":[{"id":874,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/posts\/773\/revisions\/874"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/media\/831"}],"wp:attachment":[{"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/media?parent=773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/categories?post=773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rcesystems.cz\/cs\/wp-json\/wp\/v2\/tags?post=773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}