{"id":102413,"date":"2021-11-28T15:36:40","date_gmt":"2021-11-28T13:36:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predstavlen-format-szhatiya-izobrazhenij-qoi"},"modified":"2021-11-28T15:36:40","modified_gmt":"2021-11-28T13:36:40","slug":"predstavlen-format-szhatiya-izobrazhenij-qoi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/predstavlen-format-szhatiya-izobrazhenij-qoi","title":{"rendered":"Esitatud pildikompressioonivormaat QOI","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Esitletud on uus kergekaaluline kaotusteta pildiformaat — QOI (Quite OK Image), mis v\u00f5imaldab v\u00e4ga kiiresti pilte RGB ja RGBA v\u00e4rviruumides tihendada. QOI formaadi \u00fche l\u00f5imega viiteimplementatsioon C keeles, mis ei kasuta SIMD juhiseid ega assamblee optimeerimist, \u00fcletab PNG formaadi tootlikkust kodeerimiskiiruselt 20-50 korda, samas dekodeerimiskiiruselt 3-4 korda. Tihenduse efektiivsuse osas on QOI enamikes testides libpng-iga sarnane (m\u00f5nedes testides on see veidi parem, teistes aga veidi halvem), kuid \u00fcldiselt \u00fcletab see m\u00e4rgatavalt stb_image'i (kasv kuni 20%). <\/p>\n

QOI standardne teostus C keeles koosneb kokku 300 koodireast. Allikaid jagatakse MIT litsentsi alusel. Lisaks on entusiastid loonud kodeerimise ja dekodeerimise teostuse Go, Zig ja Rust keeltes. Projekti arendab Dominic Szablewski, m\u00e4ngude arendaja, kellel on kogemus MPEG1-video dekodeerimise teegi loomisel. QOI formaadi abil soovib autor n\u00e4idata, et on v\u00f5imalik luua t\u00f5hus ja lihtne alternatiiv keerukatele t\u00e4nap\u00e4evastele pildikodeerimise vormaatidele. <\/p>\n

QOI j\u00f5udlus ei s\u00f5ltu pildi resolutsioonist v\u00f5i iseloomust (O(n)). Kr\u00fcptimine ja dekr\u00fcptimine toimub \u00fches l\u00e4bimises \u2014 iga piksel t\u00f6\u00f6deldakse ainult kord ja seda saab kodeerida \u00fche neljast viisist, mis valitakse varasemate pikslite v\u00e4\u00e4rtuste p\u00f5hjal. Kui j\u00e4rgmine piksel on sama, mis eelmine, siis suurendatakse vaid korduste arvu. Kui piksel vastab \u00fchele v\u00e4\u00e4rtusele 64 varasest pikslist, antakse selle asemel 6-bitine offset eelmise pixeli jaoks. Kui eelmise piksli v\u00e4rv erineb veidi, esitatakse erinevus l\u00fchidalt (l\u00fchendatud v\u00e4rvi komponentide erinevuste kodeerimine, mis mahub 2, 4 ja 5 bitti). Kui optimeerimist ei saa rakendada, esitatakse t\u00e4is rgba v\u00e4\u00e4rtus.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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