{"id":35989,"date":"2019-10-31T22:08:59","date_gmt":"2019-10-31T19:08:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/skanirovanie-dokumentov-po-seti\/"},"modified":"2019-10-31T22:08:59","modified_gmt":"2019-10-31T19:08:59","slug":"skanirovanie-dokumentov-po-seti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/administrirovanie\/skanirovanie-dokumentov-po-seti","title":{"rendered":"Skeniranje dokumentov prek omre\u017eja","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Skeniranje dokumenata preko mre\u017ee s jedne strane \u010dini se prisutnim, ali s druge strane jo\u0161 nije postalo op\u0107a praksa, za razliku od mre\u017enog \u0161tampanja. Administratori i dalje instaliraju drajvere, a postavljanje udaljenog skeniranja je individualno za svaki model skenera. Koje tehnologije postoje u trenutku i kakvu budu\u0107nost ima ovaj scenarij?
\n<\/a><\/noindex><\/p>\n

Instalirani drajver ili direktan pristup<\/h2>\n

\nTrenutno su u upotrebi \u010detiri tipa drajvera: TWAIN, ISIS, SANE i WIA. Ovi drajveri zapravo deluju kao interfejs izme\u0111u aplikacije i niskonivoa biblioteke od proizvo\u0111a\u010da, koja je povezana sa odre\u0111enim modelom. <\/p>\n

\"Skeniranje
\nP pojednostavljena arhitektura veze sa skenerom<\/p>\n

Obi\u010dno se podrazumeva da je skener direktno povezan sa ra\u010dunarom. Me\u0111utim, ni\u0161ta ne spre\u010dava protokol izme\u0111u niskonivoa biblioteke i ure\u0111aja. To mo\u017ee biti i TCP\/IP. Tako trenutno funkcioni\u0161e ve\u0107ina mre\u017enih MFP-ova: skener se vidi kao lokalni, ali veza ide preko mre\u017ee.<\/p>\n

Prednost ovog re\u0161enja je u tome \u0161to aplikaciji nije bitno kako je uspostavljena veza, va\u017eno je da vidi poznati TWAIN, ISIS ili drugi interfejs. Nema potrebe za implementacijom specijalne podr\u0161ke. <\/p>\n

Ali i mane su o\u010digledne. Re\u0161enje je vezano za desktop operativni sistem. Mobilni ure\u0111aji odmah ispadaju iz podr\u0161ke. Druga mana je \u0161to drajveri mogu raditi nestabilno na slo\u017eenim infrastrukturnim sistemima, na primer, na terminalnim serverima sa tankim klijentima. <\/p>\n

Re\u0161enje le\u017ei u podr\u0161ci direktnog povezivanja sa skenerom putem HTTP\/RESTful protokola. <\/p>\n

TWAIN Direct<\/h3>\n

\nTWAIN Direct<\/a><\/noindex> predlo\u017eila je TWAIN radna grupa kao opciju za pristup bez drajvera.<\/p>\n

\"Skeniranje
\nTWAIN Direct<\/p>\n

Osnovna ideja je da se sva logika prebacuje na stranu skenera. Skener pru\u017ea pristup putem REST API-a. Dodatno, specifikacija sadr\u017ei opis publikacije ure\u0111aja (autodiscovery). Izgleda dobro. Za administratora je to osloba\u0111anje od mogu\u0107ih problema sa drajverima. Podr\u0161ka za sve ure\u0111aje, va\u017eno je samo da postoji kompatibilna aplikacija. Tako\u0111e, za programere postoje prednosti, pre svega poznat interfejs interakcije. Skener deluje kao web servis. <\/p>\n

\u010ce pogledamo resni\u010dne scenarije uporabe, tudi pomanjkljivosti niso izklju\u010dene. Prva je situacija mrtve to\u010dke. Na trgu ni naprav s TWAIN Direct in razvijalcem ni smiselno podpirati te tehnologije ter obratno. Druga pomanjkljivost je varnost, specifikacija ne postavlja zahtev glede upravljanja uporabnikov, pogostosti posodobitev za zapiranje morebitnih lukenj. Prav tako ni jasno, kako lahko skrbniki nadzorujejo posodobitve in dostop. Na ra\u010dunalniku je protivirusna programska oprema. A v programski opremi skenerja, kjer bo o\u010ditno web server<\/a>, tega morda ne bo. Ali pa bo, vendar ne tisto, kar zahteva politika varnosti podjetja. Strinjate se, imeti zlonamerno programsko opremo, ki bo po\u0161iljala vse skenirane dokumente drugam, ni ravno dobro. To pomeni, da pri uvajanju tega standarda naloge, ki so jih re\u0161evale nastavitve tretjih aplikacij, prehajajo na proizvajalce naprav.<\/p>\n

Tretja pomanjkljivost je mo\u017ena izguba funkcionalnosti. Gonilniki imajo lahko dodatno obdelavo. Prepoznavanje \u010drtnih kod, odstranjevanje ozadja. Nekateri skenerji imajo t.i. imprinter \u2014 funkcijo, ki omogo\u010da skenerju, da natisne na obdelan dokument. To pri TWAIN Direct ni na voljo. Specifikacija omogo\u010da raz\u0161iritev API, vendar bo to pripeljalo do \u0161tevilnih lastnih implementacij. <\/p>\n

In \u0161e ena pomanjkljivost pri scenarijih dela s skenerjem. <\/p>\n

Skeniranje iz aplikacije ali skeniranje z naprave <\/h2>\n

\nPoglejmo, kako poteka obi\u010dajno skeniranje iz aplikacije. Dokument polo\u017eim. Nato odprete aplikacijo in skenirate. Nato vzamem dokument. Tri koraki. Zdaj si predstavljajte, da je omre\u017eni skener v drugi sobi. Potrebno je narediti vsaj 2 obiska do njega. To je manj priro\u010dno kot omre\u017eni tisk. <\/p>\n

\"Skeniranje
\nDruga\u010de pa je, ko skener sam zna poslati dokument. Na primer, na elektronsko po\u0161to. Dokument polo\u017eim. Nato skeniram. Dokument takoj leti v ciljni sistem. <\/p>\n

\"Skeniranje
\nV tem je glavni razlikovalni znak. \u010ce je naprava povezana v omre\u017eje, je la\u017eje skenirati neposredno v ciljna skladi\u0161\u010da: mapo, elektronsko po\u0161to ali ECM sistem. V tej shemi ni prostora za gonilnik. <\/p>\n

\u010ce si pogledamo z vidika, uporabljamo omre\u017eno skeniranje, ne da bi spreminjali obstoje\u010de tehnologije. In to tako iz namiznih aplikacij preko gonilnikov, kot tudi neposredno z naprave. Vendar pa se oddaljeno skeniranje iz ra\u010dunalnika ni raz\u0161irilo tako mo\u010dno, kot omre\u017eno tiskanje, zaradi razlik v delovnih scenarijih. Skeniranje neposredno v ustrezno shrambo postaja vse bolj iskan.<\/p>\n

Podpora za skenerje TWAIN Direct kot zamenjava za gonilnike je zelo pravilen korak. A standard je nekoliko zakasnjen. Uporabniki \u017eelijo skenirati neposredno z omre\u017ene naprave in po\u0161iljati dokumente na pravo mesto. Obstoje\u010de aplikacije nimajo potrebe po podpori novega standarda, saj vse \u0161e vedno deluje odli\u010dno, proizvajalcem skenerjev pa ni treba implementirati, saj ni aplikacij. <\/p>\n

In na koncu. Splo\u0161ni trend ka\u017ee, da bo preprosto skeniranje ene ali dveh strani zamenjala kamera na telefonih. Ostanem industrijsko skeniranje, kjer sta pomembna hitrost in podpora funkcijam obdelave, ki jih TWAIN Direct ne more zagotoviti, ter kjer bo ostala tesna integracija s programsko opremo klju\u010dnega pomena.
\n
Izvor: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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