Mainjiniya ochokera ku Intel abweretsa mawonekedwe azithunzi a Spectral JPEG XL, okometsedwa kuti azitha kukanikiza bwino zithunzi zomwe zimaphimba madera opitilira mawonekedwe owoneka bwino. Mtundu womwe waperekedwa umapereka mphamvu zofananira ndi mawonekedwe amtundu wa OpenEXR, koma mosiyana ndi zomalizazi, zimapereka zolemba zotayika, zomwe zimalola kuchepetsa kukula kwa fayilo ndi nthawi 10-60 poyerekeza ndi kuponderezana kosataya.
Zithunzi za Spectral sizimangokhala ndi chidziwitso chokhudza mphamvu ya kuwala mumayendedwe atatu oyambira amtundu (RGB), komanso zimaphimba mbali ya ultraviolet ndi infrared ranges. Zithunzi zoterezi zimagwiritsidwa ntchito m'madera monga kumasulira kwapamwamba, kusanthula zipangizo, ndi kuwonera deta ya sayansi. Mwachitsanzo, zithunzi zowoneka bwino zitha kugwiritsidwa ntchito kufananizira molondola mawonekedwe amtundu weniweni powonetsa, kuwunika momwe penti imawonekera pansi pa kuyatsa kosiyanasiyana, komanso kuzindikira zida ndi siginecha yake.
Kuwombera kupitirira mawonekedwe owoneka kumapangitsa kuti pakhale chitsanzo cholondola cha momwe kuwala kumayendera ndi zipangizo, koma kumabweretsa kuwonjezeka kwakukulu kwa chidziwitso chosungidwa pa pixel iliyonse. Zithunzi zowoneka bwino zimatha kukhala ndi ma tchanelo ambiri omwe amakhala ndi kutalika kosiyanasiyana ndikugwiritsa ntchito manambala oyandama a 16- kapena 32-bit panjira iliyonse, kuwalola kuti azitha kuwunikira mosiyanasiyana kuposa zithunzi wamba. Mtengo wa kuthekera uku ndikuwonjezeka kwakukulu kwa kukula poyerekeza ndi zithunzi zachikhalidwe. Mwachitsanzo, chithunzi chokhala ndi mayendedwe 81 owonjezera amatchulidwa, chomwe chimatenga 300 MB mu mtundu wa OpenEXR. Pogwiritsa ntchito Spectral JPEG XL, chithunzichi chinapanikizidwa mpaka 3.9 MB popanda kutaya mawonekedwe owoneka bwino.
Kuti muchepetse kukula, Spectral JPEG XL imagwiritsa ntchito kulekanitsa kwa data yowunikira ndi mawonekedwe owoneka bwino, ndipo imagwiritsa ntchito kusintha kwapadera kwa cosine kuti isunge mawonekedwe owoneka bwino koma kutaya tsatanetsatane wosafunika kwambiri wa mawonekedwe apamwamba. Chofunikira cha njirayi ndikusintha kusintha kosalala kwa mawonekedwe a mafunde kukhala seti ya ma wave coefficients (ma frequency coefficients), omwe, akaphatikizidwa, amapangiranso chidziwitso choyambirira cha spectral.
Mafupipafupi ma spectral coefficients amasinthidwa molingana ndi kuwala konse, zomwe zimapangitsa kuti deta yocheperako ipanikizidwe mwamphamvu kwambiri. Lingaliro ndiloti kuchokera kumalingaliro amawonedwe owoneka bwino kwambiri ndi ofunika kwambiri ndipo amasungidwa pamtundu wapamwamba kwambiri, pamene ma coefficients apamwamba sali ofunika kwambiri ndipo amatha kupanikizika kwambiri komanso kutsika kwapang'onopang'ono. Pambuyo pake, chidziwitsocho chimasinthidwa ndi codec yomwe ikugwiritsidwa ntchito pamaziko a injini yopondereza yomwe ilipo yopangidwira mtundu wa JPEG XL.
Source: opennet.ru
