{"id":16606,"date":"2021-05-20T11:03:07","date_gmt":"2021-05-20T11:03:07","guid":{"rendered":"https:\/\/test.otpor.media\/index.php\/2021\/05\/20\/https-otpor-media-sve-o-qr-kodu-i-kako-procitati-qr-kod\/"},"modified":"2021-05-20T11:03:07","modified_gmt":"2021-05-20T11:03:07","slug":"https-otpor-media-sve-o-qr-kodu-i-kako-procitati-qr-kod","status":"publish","type":"post","link":"https:\/\/otpor.media\/?p=16606","title":{"rendered":"Sve o QR kodu i kako pro\u010ditati QR kod"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Od 1. lipnja na ulazu u zatvorene prostore tra\u017eit \u0107e se QR kod kojim \u0107e se provjeravati covid-status osobe, odnosno slu\u017ebeno \u0107e se te potvrde zvati &#8216;digitalne zelene potvrde&#8217;. \u0160to je to QR kod i kako ga mo\u017eete o\u010ditati?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Barkodovi imaju va\u017enu ulogu u svijetu dana\u0161njice u kojemu su na cijeni brzina i preciznost, a gotovo da i ne postoji bolji na\u010din za brzu klasifikaciju na stotine tisu\u0107a proizvoda, pra\u0107enje inventure i organizacije skladi\u0161ta te drugih mogu\u0107ih primjena u industriji i izvan nje. Barkodovi nisu ni\u0161ta drugo nego opti\u010dka reprezentacija podataka \u010ditljivih ra\u010dunalima ili drugim ure\u0111ajima (barkodovi se o\u010ditavaju skenerom, a tuma\u010di ih za to prikladan softver).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Naj\u010de\u0161\u0107i i daleko najrasprostranjeniji barkodovi su jednodimenzionalni linijski kodovi koji su svoju popularnost postigli ponajvi\u0161e u maloprodajnim trgovinama koje su tra\u017eili na\u010din za \u0161to br\u017eu naplatu proizvoda na blagajnama. Dodu\u0161e, barkodovi dolaze i u brojnim drugim oblicima, uzorcima i geometrijskim formama te ulaze i u sferu dvodimenzionalnih matri\u010dnih kodova. Jedan od takvih barkodova kojih se proslavio zna\u010dajnijim rastom kori\u0161tenja pametnih telefone, upravo je QR kod.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rije\u010d je upravo o dvodimenzionalnom matri\u010dnom barkodu i najpopularnijem primjerku te vrste koji je nastao 1994. godine u Japanu. QR kod, ili Quick Response kod razvila je tvrtka Denso Wave, podru\u017enica Toyote, a isprva je bio namijenjen pra\u0107enju dijelova za proizvodnju vozila. Ideja je bila napraviti barkod koji \u0107e se mo\u0107i dekodirati velikom brzinom, a to je ne\u0161to \u0161to je oduvijek bio imperativ u proizvodnim procesima i pogotovo automobilskoj industriji.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"has-inline-color has-luminous-vivid-orange-color\">Nije ostao u industrijskim okvirima<\/span><\/strong><br><br>Me\u0111utim, QR kod je tijekom vremena iza\u0161ao iz industrijskih okvira i to kao sjajan mehanizam za vrlo lagan prijenos informacija iz tiskanih medija na pametne telefone. Konceptualno, potrebno je samo uperiti kameru mobilnog telefona u QR kod i u tren oka bi se trebali pojaviti podaci koje on sadr\u017eava. Masovnija upotrba QR kodova dovela je i do standardizacije, a glavna je prednost toga \u0161to se time omogu\u0107ilo da QR kod nosi specifi\u010dne tipove informacija, odnosno identifikatore za podatke kao \u0161to su SMS poruke, brojevi telefona, URL-ovi, vCard podaci i drugo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Danas je QR kod prisutan posvuda kako u svijetu tako i na doma\u0107em terenu, a njegove primjene i na\u010dini izvedbe su doista mnogobrojne. Tako je, primjerice, na snazi obveza tiskanja QR kodova na fiskalizirane ra\u010dune kako bih se lak\u0161e provjerila njihova ispravnost, a najavljene covid propusnice tako\u0111er \u0107e imati QR kod kojim \u0107e se provjeravati covid-status osobe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">QR kod mo\u017ee slu\u017eiti u marketin\u0161ke svrhe, u klasi\u010dnim oglasima i tiskanim medijima, s nerijetko se koristi i u umjetni\u010dke svrhe te postaje dijelom urbane kulture. Osim toga, prednost je i to \u0161to je QR kod jasno definiran i standardiziran i nije ograni\u010den licen\u010dnim pravima pa ga se mo\u017ee slobodno rabiti (patent dr\u017ei Denso Wave). Na \u017ealost, kao i kod svega, ima i odre\u0111enih nedostataka i QR kodovi potencijalno mogu biti opasni. Konkretnije, sadr\u017eaj koji \u0107e se dekodirati mo\u017ee, primjerice, upu\u0107ivati na maliciozni URL ili upu\u0107ivati na spajanje na malicioznu be\u017ei\u010dnu priklju\u010dnu to\u010dku. Stoga kod skeniranja QR kodova treba biti oprezan i razmisliti o kori\u0161tenju posebnih sigurnosnih aplikacija kao \u0161to je Kaspersky QR Scanner.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"has-inline-color has-luminous-vivid-orange-color\">Kako \u010ditati QR kod?<\/span><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Za o\u010ditavanje podataka koje QR kod sadr\u017ei potrebno je imati odgovaraju\u0107i ure\u0111aj opremljen softverom koji mo\u017ee dekodirati sadr\u017eane informacije. Sre\u0107om, pametni telefoni opremljeni kamerom idealni su ure\u0111aji upravo za to, a za dobar dio njih nije potrebno ni instalirati dodatne aplikacije (premda ih ima doista mnogo).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">U dobrom je djelu slu\u010dajeva potrebno samo pokrenuti aplikaciju kamere na pametnom telefonu, fizi\u010dku kameru smartfona uperiti prema QR kodu i vrlo brzo (gotovo trenutno) bi se trebala pojaviti informacija kodirana u QR kodu. Isto vrijedi i za telefone s Androidom i iPhone. Ako se to ne dogodi, to zna\u010di da je na pametni telefon potrebno instalirati neku do stotina aplikacija koje se specijaliziraju za \u010ditanje QR kodova kao \u0161to je QR &amp; Barcode Scanner ili slu\u017ebeni \u010dita\u010d QRQR. Osim toga, s takvim se aplikacijama obi\u010dno dobiva i mogu\u0107nost \u010ditanja drugih vrsta crti\u010dnih kodova, a nerijetko su precizniji i kvalitetniji u o\u010ditavanju te\u017ee \u010ditljivih kodova.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na umu valja imati i da neki proizvo\u0111a\u010di pametnih telefona ugra\u0111uju \u010ditav niz mehanizama koji olak\u0161avaju \u010ditanje QR kodova u raznim situacijama, pa valja provjeriti \u0161to je ve\u0107 dostupnu u samome pometom telefonu prije nego \u0161to se odlu\u010di instalirati specijalizirana aplikacija.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Me\u0111utim, \u0161to kada se QR kod koji se \u017eeli o\u010ditati otvori na samome mobilnom telefonu? Sre\u0107om, nije potrebno u ruke uzeti drugi smartfon kako bi se taj QR kod o\u010ditao, a jedan od prakti\u010dnih na\u010dina jest samo dulje zadr\u017eati prst nad slikom QR koda te, ako se nalazi u mobilnoj ina\u010dici Chromea, izabrati opciju Search with Google Lens u izborniku koji \u0107e se pojaviti (Google Lens se tako\u0111er mo\u017ee koristiti za skeniranje QR kodova). Alternativno se QR kod mora preuzeti kao sliku te iskoristiti neki od brojnih online \u010dita\u010da QR kodova; ne\u0161to \u0161to \u0107e se morati napraviti i na ra\u010dunalima ako pri ruci nije smartfon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"has-inline-color has-luminous-vivid-orange-color\">Anatomija QR koda<\/span><\/strong><br><br>Tehni\u010dke specifikacije QR koda detaljno su obrazlo\u017eene standardom ISO\/IEC18004 te su jednake za cijeli svijet. Jedina va\u017enija razlika izme\u0111u QR kodova, osim u podacima koje sadr\u017eavaju, le\u017ei u broju modula potrebnih za pohranu podataka. Brojevi su definirani ina\u010dicama koje idu od 1 do 40, a ina\u010dica 1 je matrica 21&#215;21. Svaki puta kada se pove\u0107ava ina\u010dica pove\u0107ava se i matrica za \u010detiri modula pa je tako ina\u010dica 40 zapravo matrica 177&#215;177. Najve\u0107i QR kod mo\u017ee u teoriji pohraniti do 4296 alfanumeri\u010dkih znakova, dok QR kod ina\u010dice 1 mo\u017ee pohraniti 25 znakova.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Treba imati na umu da se pove\u0107avanjem matrice pove\u0107ava i dimenzija samoga QR koda, a pri tome je i zanimljiva osobina da se vi\u0161e QR kodova mo\u017ee stopiti u jedan, ali i da se jedan takav kod potom mo\u017ee ra\u0161\u010dlaniti do maksimalno 16 manjih. Jedna od boljih karakteristika QR koda je i sposobnost ispravljanja pogre\u0161aka (ECC), pa tako parcijalno o\u0161te\u0107eni kod mo\u017ee i dalje biti \u010ditljiv. Postoje \u010detiri razine (L, M, Q, H), a sa svakom se pove\u0107ava postotak gre\u0161aka koji mo\u017ee biti ispravljen odnosno koliko codeworda mo\u017ee biti vra\u0107eno (codeword je jedinica koja tvori podatkovnu regiju, a jednaka je 8 bita). Pri najni\u017eoj razini &#8220;L&#8221; mogu\u0107e je ispraviti do 7 posto gre\u0161aka, dok je pri najve\u0107oj razini &#8220;H&#8221; mogu\u0107e ispraviti do 30 posto gre\u0161aka. Kvaka le\u017ei u tome da \u010dim je ve\u0107a ECC razina, time je manji kapacitet koda ili se mora pove\u0107ati dimenzija, a time i ina\u010dica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ono \u0161to je tu vrlo va\u017eno \u010dinjenica je da su kodovi visokih ina\u010dica te\u017ee \u010ditljivi na mobilnim ure\u0111ajima. Neslu\u017ebena je preporuka da bi QR kodovi namijenjeni isklju\u010divo \u010ditanju putem mobilnih telefona trebali biti maksimalno ina\u010dice 4. Dakle, najve\u0107i kod bi trebao biti matrica 33&#215;33 koja podr\u017eava do 90 alfanumeri\u010dkih znakova pri &#8220;M&#8221; ECC razini kako biste bili sigurni da \u0107e ih kamere na mobilnim ure\u0111ajima uspje\u0161no skenirati. Nije mnogo, no dovoljno za broj telefona ili adresu web-stranice. Uz to je i vrlo va\u017eno istaknuti kako se oko rubova QR koda treba uvijek ostaviti praznoga prostora ili quiet zone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"has-inline-color has-luminous-vivid-amber-color\"><a href=\"https:\/\/www.bug.hr\/savjeti\/sve-o-qr-kodu-i-kako-procitati-qr-kod-21435\" data-type=\"URL\" data-id=\"https:\/\/www.bug.hr\/savjeti\/sve-o-qr-kodu-i-kako-procitati-qr-kod-21435\" target=\"_blank\" rel=\"noreferrer noopener\">Bug.hr<\/a><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Od 1. lipnja na ulazu u zatvorene prostore tra\u017eit \u0107e se QR kod kojim \u0107e se provjeravati covid-status osobe, odnosno slu\u017ebeno \u0107e se te potvrde zvati &#8216;digitalne zelene potvrde&#8217;. \u0160to je to QR kod i kako ga mo\u017eete o\u010ditati? Barkodovi imaju va\u017enu ulogu u svijetu dana\u0161njice u kojemu su na cijeni brzina i preciznost, a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3710,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[163],"tags":[],"class_list":["post-16606","post","type-post","status-publish","format-standard","has-post-thumbnail","category-revolucijska-znanost"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Sve o QR kodu i kako pro\u010ditati QR kod - OTPOR.Media<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/otpor.media\/?p=16606\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sve o QR kodu i kako pro\u010ditati QR kod\" \/>\n<meta property=\"og:description\" content=\"Od 1. lipnja na ulazu u zatvorene prostore tra\u017eit \u0107e se QR kod kojim \u0107e se provjeravati covid-status osobe, odnosno slu\u017ebeno \u0107e se te potvrde zvati &#8216;digitalne zelene potvrde&#8217;. \u0160to je to QR kod i kako ga mo\u017eete o\u010ditati? 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