{"id":36741,"date":"2019-10-31T22:13:29","date_gmt":"2019-10-31T19:13:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uvidet-pochti-nevidimoe-eshhe-i-v-tsvete-metodika-vizualizatsii-obektov-cherez-rasseivatel\/"},"modified":"2019-10-31T22:13:29","modified_gmt":"2019-10-31T19:13:29","slug":"uvidet-pochti-nevidimoe-eshhe-i-v-tsvete-metodika-vizualizatsii-obektov-cherez-rasseivatel","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/uvidet-pochti-nevidimoe-eshhe-i-v-tsvete-metodika-vizualizatsii-obektov-cherez-rasseivatel","title":{"rendered":"T\u00eb shoh\u00ebsh pothuajse t\u00eb padukshme, madje edhe n\u00eb ngjyr\u00eb: nj\u00eb metod\u00eb vizualizimi objektesh p\u00ebrmes nj\u00eb shp\u00ebrndar\u00ebsi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"T\u00eb
\n
\nNj\u00eb nga aft\u00ebsit\u00eb m\u00eb t\u00eb famshme t\u00eb Superman \u00ebsht\u00eb shikimi i tij i jasht\u00ebzakonsh\u00ebm, i cili i lejon atij t\u00eb shoh\u00eb atomet, t\u00eb shoh\u00eb n\u00eb err\u00ebsir\u00eb dhe n\u00eb distanca t\u00eb m\u00ebdha, si dhe t\u00eb shikoj\u00eb p\u00ebrmes objekteve. Kjo aft\u00ebsi rrall\u00eb demonstrohet n\u00eb ekranet, por ekziston. N\u00eb realitetin ton\u00eb, t\u00eb shoh\u00ebsh p\u00ebrmes objekteve pothuajse t\u00eb pap\u00ebrshkuesh\u00ebm \u00ebsht\u00eb gjithashtu e mundur duke aplikuar disa truqe shkencore. Megjithat\u00eb, imazhet e marra kan\u00eb qen\u00eb gjithmon\u00eb bardh e zi, deri koh\u00ebt e fundit. Sot do t\u00eb njohim nj\u00eb studim ku shkenc\u00ebtar\u00ebt nga Universiteti i Duk\u00ebs (SHBA) arrit\u00ebn t\u00eb b\u00ebnin nj\u00eb imazh me ngjyra t\u00eb objekteve t\u00eb fshehura pas nj\u00eb muri t\u00eb pap\u00ebrshkuesh\u00ebm, duke p\u00ebrdorur nj\u00eb ekspozim t\u00eb vet\u00ebm t\u00eb drit\u00ebs. \u00c7far\u00eb \u00ebsht\u00eb kjo super-teknologji, si funksionon ajo dhe n\u00eb cilat fusha mund t\u00eb aplikohet? K\u00ebto do t'na tregoj\u00eb raporti i grupit k\u00ebrkimor. Le t\u00eb fillojm\u00eb.<\/a><\/noindex><\/p>\n

Baza e studimit<\/h3>\n

\nPavar\u00ebsisht t\u00eb gjitha mund\u00ebsive t\u00eb teknologjis\u00eb s\u00eb vizualizimit t\u00eb objekteve n\u00eb mjedise shp\u00ebrthyese, ekzistojn\u00eb disa probleme t\u00eb realizimit t\u00eb k\u00ebsaj teknologjie. Problemi kryesor \u00ebsht\u00eb se rrug\u00ebt e fotoneve q\u00eb kalojn\u00eb p\u00ebrmes shp\u00ebrndar\u00ebsit ndryshojn\u00eb shum\u00eb, duke \u00e7uar n\u00eb modele rast\u00ebsore. spekl*<\/i> nga ana tjet\u00ebr.<\/p>\n

\"T\u00eb
\nSpekl*<\/b> \u00ebsht\u00eb nj\u00eb model rast\u00ebsor interferenc\u00eb q\u00eb formohet kur val\u00ebt koherente nd\u00ebrveprojn\u00eb, t\u00eb cilat kan\u00eb zhvendosje fazore rast\u00ebsore dhe\/ose nj\u00eb grup t\u00eb rast\u00ebsish\u00ebm intensiteti. Shpesh duket si nj\u00eb grup njollash t\u00eb ndritshme (pikash) n\u00eb nj\u00eb sfond t\u00eb err\u00ebt.<\/p><\/blockquote>\n

Gjat\u00eb viteve t\u00eb fundit jan\u00eb zhvilluar disa metoda vizualizimi q\u00eb lejojn\u00eb kalimin p\u00ebrmes efekteve t\u00eb shp\u00ebrndar\u00ebsit dhe nxjerrjen e informacionit p\u00ebr objektin nga modelin e speklit. Problemi me k\u00ebto metoda \u00ebsht\u00eb kufizimi i tyre - \u00ebsht\u00eb e nevojshme t\u00eb kesh njohuri t\u00eb caktuara mbi objektin, t\u00eb kesh qasje n\u00eb mjedisin shp\u00ebrndar\u00ebs ose objektin etj.<\/p>\n

N\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb, ekziston nj\u00eb metod\u00eb m\u00eb e p\u00ebrparuar, sipas shkenc\u00ebtar\u00ebve - vizualizimi me efektin e kujtes\u00ebs (ME). Kjo metod\u00eb lejon vizualizimin e objektit pa njohuri paraprake n\u00eb lidhje me vet\u00eb objektin ose mjedisin shp\u00ebrndar\u00ebs. T\u00eb gjitha metodat kan\u00eb disavantazhe, dhe metoda ME nuk \u00ebsht\u00eb p\u00ebrjashtim. P\u00ebr t\u00eb marr\u00eb modele spekl me kontrast t\u00eb lart\u00eb dhe, p\u00ebr rrjedhoj\u00eb, imazhe m\u00eb t\u00eb sakta, ndri\u00e7imi duhet t\u00eb jet\u00eb me nukleus t\u00eb ngusht\u00eb, dmth m\u00eb pak se 1 nm.<\/p>\n

T\u00eb kap\u00ebsh kufizimet e metod\u00ebs ME \u00ebsht\u00eb gjithashtu e mundur, por, p\u00ebrs\u00ebri, k\u00ebto truqe lidhen me qasjen n\u00eb burimin optik ose objektin para shp\u00ebrndar\u00ebsit ose me matjen e drejtp\u00ebrdrejt\u00eb. PSF*<\/i>.<\/p>\n

PSF*<\/b> \u00ebsht\u00eb funksioni i shp\u00ebrndarjes s\u00eb pik\u00ebs q\u00eb p\u00ebrshkruan imazhin q\u00eb merr sistemi i formimit kur v\u00ebzhgon nj\u00eb burim drit\u00eb t\u00eb pik\u00ebs ose nj\u00eb objekt t\u00eb pik\u00ebs. <\/p><\/blockquote>\n

K\u00ebrkuesit i quajn\u00eb k\u00ebto metoda funksionale, por jo perfekte, pasi matja e PSF nuk \u00ebsht\u00eb gjithmon\u00eb e mundur p\u00ebr shkak, p\u00ebr shembull, t\u00eb dinamik\u00ebs s\u00eb shp\u00ebrndar\u00ebsit ose munges\u00ebs s\u00eb aksesit p\u00ebrpara procedur\u00ebs s\u00eb vizualizimit. Me fjal\u00eb t\u00eb tjera, ka shum\u00eb p\u00ebr t\u00eb punuar. <\/p>\n

N\u00eb pun\u00ebn e tyre, k\u00ebrkuesit propozojn\u00eb nj\u00eb qasje tjet\u00ebr. Ata na demonstrojn\u00eb nj\u00eb metod\u00eb p\u00ebr realizimin e vizualizimit multispektral t\u00eb objekteve p\u00ebrmes nj\u00eb mjedisi shp\u00ebrndar\u00ebs duke p\u00ebrdorur nj\u00eb matje t\u00eb vetme spekl me nj\u00eb kamer\u00eb monokromatike. Ndryshe nga metodat e tjera, kjo nuk k\u00ebrkon njohuri paraprake n\u00eb lidhje me sistemin PSF ose spektrin e burimit.<\/p>\n

Metoda e re lejon krijimin e imazheve t\u00eb cil\u00ebsis\u00eb s\u00eb lart\u00eb t\u00eb objektit t\u00eb synuar n\u00eb pes\u00eb kanale spektrale t\u00eb mir\u00eb t\u00eb ndara midis 450 nm dhe 750 nm, gj\u00eb q\u00eb \u00ebsht\u00eb konfirmuar nga llogaritjet. N\u00eb praktik\u00eb, deri tani \u00ebsht\u00eb arritur t\u00eb vizualizohet tre kanale spektrale t\u00eb mir\u00eb t\u00eb ndara midis 450 nm dhe 650 nm dhe gjasht\u00eb kanale spektrale t\u00eb ngjitura midis 515 dhe 575 nm.<\/p>\n

Parimi i funksionimit t\u00eb metod\u00ebs s\u00eb re<\/h3>\n

\n\"T\u00eb
\nImazhi Nr. 1: llamba - modulatori hap\u00ebsinor i drit\u00ebs - shp\u00ebrndari (me diafragm\u00ebn iris\u00e9e) - apertura koduese - prisma - rillet optike (vizualizimi 1:1) - kamera monokromatike.<\/i><\/p>\n

K\u00ebrkuesit theksojn\u00eb tre element\u00ebt kryesor\u00eb t\u00eb \u00e7do vizualizimi p\u00ebrmes nj\u00eb shp\u00ebrndar\u00ebsi: objekti i interesit (i ndri\u00e7uar nga jasht\u00eb ose q\u00eb ndri\u00e7ohet vet\u00eb), shp\u00ebrndar\u00ebsi dhe detektori.<\/p>\n

Si n\u00eb sistemet standarde ME, n\u00eb k\u00ebt\u00eb studim shqyrtohet nj\u00eb objekt, p\u00ebrmasat e k\u00ebndshme t\u00eb t\u00eb cilit ndodhen brenda fush\u00ebs s\u00eb shikimit t\u00eb ME dhe n\u00eb nj\u00eb distanc\u00eb u pas shp\u00ebrndar\u00ebsit. Pas nd\u00ebrveprimit me shp\u00ebrndar\u00ebsin, drita p\u00ebrhapet n\u00eb nj\u00eb distanc\u00eb v, p\u00ebrpara se t\u00eb arrij\u00eb te detektori. <\/p>\n

Vizualizimi standard ME p\u00ebrdor kamera standarde, nd\u00ebrsa ky metod p\u00ebrdor nj\u00eb modul detektor kodues, i cili p\u00ebrb\u00ebhet nga nj\u00eb apertur\u00eb koduese dhe nj\u00eb element optik t\u00eb varur nga gjat\u00ebsia e val\u00ebs. Q\u00ebllimi i k\u00ebtij elementi \u00ebsht\u00eb modulisht unike t\u00eb \u00e7do kanali spektral p\u00ebrpara se t\u2019i bashkoj\u00eb ato dhe t\u2019i konvertoj\u00eb n\u00eb nj\u00eb detektor monokromatik.<\/p>\n

K\u00ebshtu, n\u00eb vend t\u00eb thjesht\u00ebsis\u00eb s\u00eb matjes s\u00eb spektrit me kontrast t\u00eb ul\u00ebt, kanalet spektrale t\u00eb t\u00eb cil\u00ebve jan\u00eb t\u00eb p\u00ebrziera, u regjistrua nj\u00eb sinjal spektralisht t\u00eb shum\u00ebfisht\u00eb, i cili \u00ebsht\u00eb shum\u00eb i p\u00ebrshtatsh\u00ebm p\u00ebr ndarje.<\/p>\n

K\u00ebrkuesit theksojn\u00eb p\u00ebrs\u00ebri se metoda e tyre nuk k\u00ebrkon asnj\u00eb karakteristik\u00eb ose supozim t\u00eb njohur paraprakisht n\u00eb lidhje me shp\u00ebrndar\u00ebsin ose burimin e drit\u00ebs.<\/p>\n

Pas realizimit t\u00eb matjeve paraprake t\u00eb spektrit t\u00eb shum\u00ebfisht\u00eb, u p\u00ebrdor nj\u00eb vler\u00eb e njohur T\u03bb (modeli kodues, i varur nga gjat\u00ebsia e val\u00ebs) p\u00ebr rikonstruksionin individual t\u00eb spektrit n\u00eb secil\u00ebn band\u00eb spektrale.<\/p>\n

N\u00eb pun\u00ebn e tij, gjat\u00eb hapit t\u00eb llogaritjeve dhe modelimit, shkenc\u00ebtar\u00ebt aplikuan metoda t\u00eb caktuara t\u00eb m\u00ebsimit t\u00eb makinerive, t\u00eb cilat mund t\u00eb ndihmojn\u00eb n\u00eb realizimin e nj\u00eb metode t\u00eb pa shqyrtuar m\u00eb par\u00eb. S\u00eb pari, u p\u00ebrdor m\u00ebsimi i karakteristikave t\u00eb matric\u00ebs s\u00eb holl\u00eb p\u00ebr t\u00eb reprezentuar spektrin. <\/p>\n

M\u00ebsimi i karakteristikave*<\/b> \u2014 i lejon sistemit t\u00eb gjej\u00eb automatikisht p\u00ebrfaq\u00ebsime t\u00eb nevojshme p\u00ebr identifikimin e karakteristikave t\u00eb t\u00eb dh\u00ebnave origjinale.<\/p><\/blockquote>\n

Si rezultat, u krijua nj\u00eb baz\u00eb e trajnuar n\u00eb imazhe speklike nga konfigurime t\u00eb ndryshme matjesh. Kjo baz\u00eb \u00ebsht\u00eb mjaft e p\u00ebrgjithshme dhe nuk varet nga objektet specifike dhe shp\u00ebrndar\u00ebsit q\u00eb jan\u00eb t\u00eb p\u00ebrfshir\u00eb n\u00eb gjenerimin e mask\u00ebs I\u03bbx, y. N\u00eb fjal\u00eb t\u00eb tjera, sistemi m\u00ebsohet n\u00eb baz\u00eb t\u00eb shp\u00ebrndar\u00ebsit q\u00eb nuk p\u00ebrdoret n\u00eb konfigurimin eksperimental, dmth. sistemi nuk ka akses n\u00eb t\u00eb, si\u00e7 d\u00ebshironin k\u00ebrkuesit.<\/p>\n

P\u00ebr t\u00eb marr\u00eb imazhe speklike n\u00eb \u00e7do gjat\u00ebsin\u00eb e val\u00ebs, u p\u00ebrdor algoritmi OMP (purshtatja ortogonale e p\u00ebrputhjes<\/i>).<\/p>\n

N\u00eb fund, duke llogaritur autocorrellacionin e \u00e7do kanali spektral n\u00eb m\u00ebnyr\u00eb t\u00eb pavarur dhe duke invertuar autocorrellacionin n\u00eb \u00e7do gjat\u00ebsi vale, u mor\u00ebn imazhet e objektit. Imazhet e marra n\u00eb \u00e7do gjat\u00ebsi vale m\u00eb pas bashkohen p\u00ebr t\u00eb krijuar nj\u00eb imazh ngjyror t\u00eb objektit.<\/p>\n

\"T\u00eb
\nImazhi Nr. 2: procesi hap pas hapi i krijimit t\u00eb imazhit t\u00eb objektit.
\nKjo metod\u00eb, sipas krijuesve t\u00eb saj, nuk b\u00ebn asnj\u00eb supozim mbi korrelacionet midis kanaleve spektrale dhe k\u00ebrkon vet\u00ebm supozimin se vlera e gjat\u00ebsi s\u00eb val\u00ebs \u00ebsht\u00eb mjaft e rast\u00ebsishme. P\u00ebrve\u00e7 k\u00ebsaj, kjo metod\u00eb k\u00ebrkon vet\u00ebm informacion mbi detektor\u00ebt kodues, duke u mb\u00ebshtetur n\u00eb kalibrimin paraprak t\u00eb apertur\u00ebs koduese dhe nj\u00eb bibliotek\u00eb t\u00eb dh\u00ebnash t\u00eb trajnuar paraprakisht. K\u00ebto karakteristika e b\u00ebjn\u00eb k\u00ebt\u00eb metod\u00eb vizualizimi mjaft universale dhe jo-invazive. <\/p>\n

Rezultatet e modelimit<\/h3>\n

\nP\u00ebr t\u00eb filluar, le t\u00eb shqyrtojm\u00eb rezultatet e modelimit. <\/p>\n

\"T\u00eb
\nImazhi Nr. 3<\/i><\/p>\n

N\u00eb imazhin e m\u00ebsip\u00ebrm jan\u00eb paraqitur shembuj t\u00eb nj\u00eb fotografie multispektrale t\u00eb dy objekteve, t\u00eb realizuara p\u00ebrmes shp\u00ebrndar\u00ebsit. Rreshti i sip\u00ebrm n\u00eb 3a<\/b> p\u00ebrmban objektin e interesit, i p\u00ebrb\u00ebr\u00eb nga disa numra, t\u00eb shfaqur si n\u00eb ngjyr\u00eb t\u00eb rreme ashtu edhe n\u00eb shp\u00ebrndarjen sipas kanaleve spektrale. Kur nd\u00ebrtimi i objektit \u00ebsht\u00eb n\u00eb ngjyr\u00eb t\u00eb rreme, tregohet profili i intensitetit t\u00eb \u00e7do gjat\u00ebsie vale n\u00eb hap\u00ebsir\u00ebn CIE 1931 RGB.<\/p>\n

Objekti i rikonstruktuar (rreshti i posht\u00ebm n\u00eb 3a<\/b>) si n\u00eb ngjyr\u00eb t\u00eb rreme ashtu edhe nga k\u00ebndv\u00ebshtrimi i kanaleve spektrale individuale, tregon se teknika ofron vizualizim t\u00eb shk\u00eblqyer dhe vet\u00ebm nj\u00eb nd\u00ebrveprim t\u00eb vog\u00ebl midis kanaleve spektrale, i cili nuk luan ndonj\u00eb rol t\u00eb ve\u00e7ant\u00eb n\u00eb proces.<\/p>\n

Pas marrjes s\u00eb objektit t\u00eb rikonstruktuar, dmth. pas vizualizimit, ishte e nevojshme t\u00eb vler\u00ebsohej shkalla e sakt\u00ebsis\u00eb, duke krahasuar intensitetin spektral (t\u00eb mes\u00ebm mbi t\u00eb gjitha piksel\u00ebt e ndritshme) t\u00eb objektit t\u00eb v\u00ebrtet\u00eb dhe t\u00eb rikonstruktuar (3b<\/b>).<\/p>\n

N\u00eb imazhet 3c<\/b> tregohet objekti real (rreshti i sip\u00ebrm) dhe imazhi i rikonstruktuar (rreshti i posht\u00ebm) p\u00ebr nj\u00eb qeliz\u00eb nga mesi i pambukut, nd\u00ebrsa n\u00eb 3d<\/b> tregohet analiza e sakt\u00ebsis\u00eb s\u00eb vizualizimit.<\/p>\n

P\u00ebr t\u00eb vler\u00ebsuar sakt\u00ebsin\u00eb e vizualizimit, ishte e nevojshme t\u00eb llogariteshin vlerat e koeficientit t\u00eb ngjashm\u00ebris\u00eb strukturore (SSIM) dhe raporti maksimal i sinjalit ndaj zhurm\u00ebs (pSNR) t\u00eb objektit t\u00eb v\u00ebrtet\u00eb p\u00ebr \u00e7do kanal spektral.<\/p>\n

\"T\u00eb
\n
\nTabela m\u00eb sip\u00ebr tregon se \u00e7do nj\u00eb nga pes\u00eb kanalet ka nj\u00eb koeficient SSIM 0,8\u20130,9 dhe PSNR m\u00eb shum\u00eb se 20. Nga k\u00ebtu mund t\u00eb p\u00ebrfundojm\u00eb se, edhe pse kontrasti i sinjalit spekular \u00ebsht\u00eb i ul\u00ebt, mbivendosja n\u00eb detektor me pes\u00eb banda spektrale me gjer\u00ebsi 10 nm lejon rikonstruksionin mjaft t\u00eb sakt\u00eb t\u00eb pronave hap\u00ebsinore-spektrale t\u00eb objektit t\u00eb studiuar. N\u00eb fjal\u00eb t\u00eb tjera, metodologjia funksionon, megjith\u00ebse k\u00ebto jan\u00eb vet\u00ebm rezultate simuluese. P\u00ebr t\u00eb pasur m\u00eb shum\u00eb besim n\u00eb rezultatet e veta, shkenc\u00ebtar\u00ebt kan\u00eb kryer nj\u00eb s\u00ebr\u00eb eksperimenti praktik.<\/p>\n

Rezultatet e eksperimenteve<\/h3>\n

\nNj\u00eb nga dallimet m\u00eb t\u00eb r\u00ebnd\u00ebsishme midis modelimit dhe eksperimenteve reale \u00ebsht\u00eb mjedisi, pra kushte n\u00eb t\u00eb cilat \u00e7mohen t\u00eb dyja. N\u00eb rastin e par\u00eb, kemi kushte t\u00eb kontrolluara, nd\u00ebrsa n\u00eb t\u00eb dytin \u2014 t\u00eb paparashikueshme, pra si do t\u00eb dal\u00eb.<\/p>\n

U shqyrtuan tre kanale spektrale me gjer\u00ebsi 8-12 nm me qend\u00ebr n\u00eb 450, 550 dhe 650 nm, t\u00eb cilat n\u00eb kombinim me sasi t\u00eb ndryshme relative gjenerojn\u00eb nj\u00eb gam\u00eb t\u00eb gjer\u00eb ngjyrash.<\/p>\n

\"T\u00eb
\nImazhi \u21164<\/i><\/p>\n

N\u00eb imazhin m\u00eb sip\u00ebr shikohet krahasimi midis objektit real (lir\u00eb ngjyr\u00eb \u00abH\u00bb) dhe atij t\u00eb rikonstruktuar. Koha e ekspozimit u vendos n\u00eb 1800 s, e cila leht\u00ebsoi marrjen e SNR nga 60-70 dB. Ky tregues SNR, sipas shkenc\u00ebtar\u00ebve, nuk \u00ebsht\u00eb jasht\u00ebzakonisht i r\u00ebnd\u00ebsish\u00ebm p\u00ebr eksperimenti, por sh\u00ebrben si nj\u00eb konfirmim shtes\u00eb t\u00eb funksionimit t\u00eb metodologjis\u00eb s\u00eb tyre, sidomos n\u00eb rastin e objekteve komplekse. N\u00eb realitet, e jo n\u00eb kushte laboratorike, kjo metod\u00eb mund t\u00eb jet\u00eb nj\u00eb radh\u00eb m\u00eb e shpejt\u00eb.<\/p>\n

Rreshti i sip\u00ebrm i imazhit \u21164 tregon objektin n\u00eb \u00e7do gjat\u00ebsi vale (nga majta n\u00eb t\u00eb djatht\u00ebn) dhe objektin e plot\u00eb ngjyr\u00eb real.<\/p>\n

P\u00ebr t\u00eb marr\u00eb nj\u00eb imazh t\u00eb objektit real n\u00eb vizualizim, u p\u00ebrdor nj\u00eb kamer\u00eb e njohur makinerie me filtre bardh\u00eb ose t\u00eb ngjyrave p\u00ebr t\u00eb pasqyruar drejtp\u00ebrdrejt p\u00ebrb\u00ebr\u00ebsit spektral\u00eb dhe p\u00ebr t\u00eb marr\u00eb nj\u00eb imazh me ngjyra duke grumbulluar kanalet spektrale t\u00eb rezultatit.<\/p>\n

Rreshti i dyt\u00eb i imazhit m\u00eb sip\u00ebr tregon format e autokorelacionit t\u00eb \u00e7do kanali spektral t\u00eb rikonstruktuar, duke formuar matje t\u00eb shumfishuara, t\u00eb cilat jan\u00eb t\u00eb dh\u00ebnat hyr\u00ebse p\u00ebr faz\u00ebn e p\u00ebrpunimit t\u00eb t\u00eb dh\u00ebnave.<\/p>\n

Rreshti i tret\u00eb \u00ebsht\u00eb objekti i rikonstruktuar n\u00eb \u00e7do kanal spektral, si dhe objekti i rikonstruktuar me ngjyra, pra rezultati p\u00ebrfundimtar i vizualizimit.<\/p>\n

Imazhi me ngjyra tregon se relatimet midis kanaleve spektrale gjithashtu jan\u00eb t\u00eb sakta, pasi ngjyra e imazhit t\u00eb rikonstruktuar p\u00ebrputhet me vler\u00ebn reale, dhe koeficienti SSIM arrin m\u00eb shum\u00eb se 0,92 p\u00ebr \u00e7do kanal.<\/p>\n

Rreshti m\u00eb posht\u00eb \u00ebsht\u00eb nj\u00eb konfirmim i k\u00ebsaj, duke demonstruar krahasimin e intensitetit t\u00eb objektit real dhe atij t\u00eb rikonstruktuar. T\u00eb dh\u00ebnat e t\u00eb dyve p\u00ebrputhen n\u00eb t\u00eb gjitha gamat spektrale.<\/p>\n

K\u00ebtu mund t\u00eb p\u00ebrfundojm\u00eb se edhe prania e zhurm\u00ebs dhe gabimeve potenciale n\u00eb modelim nuk penguan marrjen e nj\u00eb imazhi t\u00eb cil\u00ebsis\u00eb s\u00eb lart\u00eb, dhe rezultatet e eksperimenteve p\u00ebrputhen mjaft mir\u00eb me rezultatet e modelimeve.<\/p>\n

Eksperimenti i p\u00ebrshkruar m\u00eb sip\u00ebr u zhvillua duke pasur parasysh kanalet spektrale t\u00eb ndara. Shkenc\u00ebtar\u00ebt kryen nj\u00eb tjet\u00ebr eksperiment, por tani me kanale t\u00eb ngjashme, m\u00eb sakt\u00ebsisht me nj\u00eb gam\u00eb spektrale t\u00eb vazhdueshme prej 60 nm.<\/p>\n

\"T\u00eb
\nImazhi nr. 5<\/i><\/p>\n

Si objekt real sh\u00ebrbeu letra \u00abX\u00bb dhe shenj\u00eb \u00ab+\u00bb (5a<\/b>). Spektri i letr\u00ebs \u00abX\u00bb \u00ebsht\u00eb relativisht i nj\u00ebtrajtsh\u00ebm dhe i pand\u00ebrprer\u00eb - midis 515 dhe 575 nm, nd\u00ebrsa \u00ab+\u00bb ka nj\u00eb spektral t\u00eb strukturuesh\u00ebm, kryesisht i pozicionuar midis 535 dhe 575 nm (5b<\/b>). P\u00ebr k\u00ebt\u00eb eksperiment, ekspozita ishte 120 s p\u00ebr t\u00eb arritur SNR-in e d\u00ebshiruar (si m\u00eb par\u00eb) prej 70 dB.<\/p>\n

Nj\u00eb gjithashtu u p\u00ebrdor nj\u00eb filtr\u00eb band\u00eb 60 nm mbi t\u00eb gjith\u00eb objektin dhe nj\u00eb filtr\u00eb t\u00eb ul\u00ebt frekuenc\u00eb mbi shenj\u00ebn \u00ab+\u00bb. Gjat\u00eb rikonstruksionit spektri 60 nm ndahet n\u00eb 6 kanale t\u00eb ngjashme me gjer\u00ebsi 10 nm (5b<\/b>).<\/p>\n

Si\u00e7 mund ta shohim nga imazhet 5c<\/b>, imazhet e rezultatet p\u00ebrputhen shum\u00eb mir\u00eb me objektin real. Ky eksperiment tregoi se prania ose mungesa e korrelacioneve spektrale n\u00eb speklet e matura nuk ndikon n\u00eb efikasitetin e metodologjis\u00eb s\u00eb vizualizimit t\u00eb studiuar. Shkenc\u00ebtar\u00ebt vet\u00eb besojn\u00eb se nj\u00eb rol m\u00eb t\u00eb madh n\u00eb procesin e vizualizimit, konkretisht n\u00eb suksesin e tij, luajn\u00eb jo aq karakteristikat spektrale t\u00eb objektit, sa kalibrimi i sistemit dhe detajet e detektorit t\u00eb tij kodues.<\/p>\n

Epilogu<\/h3>\n

\nN\u00eb k\u00ebt\u00eb punim, shkenc\u00ebtar\u00ebt p\u00ebrshkruajn\u00eb nj\u00eb metod\u00eb t\u00eb re t\u00eb vizualizimit multispektral p\u00ebrmes dispersorit. Modulimi i spekllit, i varur nga vala, p\u00ebrmes nj\u00eb aperture koduese, leht\u00ebson kryerjen e nj\u00eb matjeje t\u00eb shum\u00ebfisht\u00eb dhe llogaritjen e spekllit p\u00ebrmes algoritmit OMP t\u00eb bazuar n\u00eb m\u00ebsimin automat. <\/p>\n

P\u00ebrmes nj\u00eb shembulli t\u00eb nj\u00eb letre shum\u00ebngjyr\u00ebshe 'H', shkenc\u00ebtar\u00ebt tregojn\u00eb se fokusimi n\u00eb pes\u00eb kanale spektrale, p\u00ebrkat\u00ebsisht n\u00eb violet, t\u00eb gjelb\u00ebr dhe tri nuanca t\u00eb kuqe, lejon nj\u00eb rikonstruksion t\u00eb imazhit q\u00eb p\u00ebrmban t\u00eb gjith\u00eb ngjyrat e origjinalit (blu, e verdh\u00eb, etj.). <\/p>\n

Sipas hulumtuesve, metodologjia e tyre mund t\u00eb jet\u00eb e dobishme si n\u00eb mjek\u00ebsi, ashtu edhe n\u00eb astronomi. Ngjyra mban informacion t\u00eb r\u00ebnd\u00ebsish\u00ebm n\u00eb t\u00eb dyja drejtimet: n\u00eb astronomi - p\u00ebrb\u00ebrja kimike e objekteve q\u00eb studiohen, n\u00eb mjek\u00ebsi - p\u00ebrb\u00ebrja molekulare e qelizave dhe indeve.<\/p>\n

N\u00eb k\u00ebt\u00eb faz\u00eb, shkenc\u00ebtar\u00ebt theksojn\u00eb vet\u00ebm nj\u00eb problem q\u00eb mund t\u00eb shkaktoj\u00eb pasakt\u00ebsi n\u00eb vizualizim, q\u00eb jan\u00eb gabimet n\u00eb modelim. P\u00ebr shkak t\u00eb koh\u00ebs mjaft t\u00eb gjat\u00eb t\u00eb nevojshme p\u00ebr t\u00eb kryer procesin, mund t\u00eb ndodhin ndryshime n\u00eb mjedis, t\u00eb cilat do t\u00eb sjellin korrektime q\u00eb nuk jan\u00eb marr\u00eb parasysh n\u00eb faz\u00ebn e p\u00ebrgatitjes. Megjithat\u00eb, n\u00eb t\u00eb ardhmen planifikohet t\u00eb gjendet nj\u00eb m\u00ebnyr\u00eb p\u00ebr t\u00eb eliminuar k\u00ebt\u00eb problem, \u00e7ka do t\u00eb mund\u00ebsoj\u00eb q\u00eb metodika e p\u00ebrshkruar e vizualizimit jo vet\u00ebm t\u00eb jet\u00eb e sakt\u00eb, por edhe e q\u00ebndrueshme n\u00eb \u00e7do kushte.<\/p>\n

Of-topi i premtes:<\/b>

\r\n \"Luaj\r\n
<\/div>\r\n <\/div><\/center>
\nDrita, ngjyra, muzika dhe trio i tre '\u00e7udit\u00ebve' m\u00eb t\u00eb famsh\u00ebm t\u00eb blus\u00eb n\u00eb bot\u00eb (Blue Man Group).<\/i><\/p>\n

Faleminderit p\u00ebr v\u00ebmendjen, mbani kuriozitetin n\u00eb jet\u00eb dhe shijoni fundjav\u00ebn, shok\u00eb! \ud83d\ude42<\/p>\n

\nFaleminderit q\u00eb jeni me ne. Ju p\u00ebrqejn\u00eb artikujt tan\u00eb? Doni t\u00eb shihni m\u00eb shum\u00eb materiale interesante? Na mb\u00ebshtesni me nj\u00eb porosi ose duke na rekomanduar miqve tuaj, 30% zbritje p\u00ebr p\u00ebrdoruesit e Habra p\u00ebr nj\u00eb alternativ\u00eb unike t\u00eb server\u00ebve entry-level, e cila \u00ebsht\u00eb krijuar nga ne p\u00ebr ju:<\/b> E gjith\u00eb e v\u00ebrteta rreth VPS (KVM) E5-2650 v4 (6 Ndot\u00ebs) 10GB DDR4 240GB SSD 1Gbps nga $20, ose si ta ndash n\u00eb m\u00ebnyr\u00eb t\u00eb duhur serverin?<\/a><\/noindex> (disponohen variante me RAID1 dhe RAID10, deri n\u00eb 24 b\u00ebrthama dhe deri n\u00eb 40GB DDR4).<\/p>\n

Dell R730xd p\u00ebr dy her\u00eb m\u00eb lir\u00eb?<\/b> Vet\u00ebm k\u00ebtu 2 x Intel TetraDeca-Core Xeon 2x E5-2697v3 2.6GHz 14C 64GB DDR4 4x960GB SSD 1Gbps 100 TB nga $199<\/a><\/noindex> n\u00eb Holand\u00eb! Dell R420 \u2014 2x E5-2430 2.2Ghz 6C 128GB DDR3 2x960GB SSD 1Gbps 100TB \u2014 nga $99!<\/b><\/b> Lexoni rreth Si t\u00eb nd\u00ebrtosh nj\u00eb infrastruktur\u00eb t\u00eb klas\u00ebs korporative me p\u00ebrdorimin e server\u00ebve Dell R730xd E5-2650 v4 me \u00e7mim prej 9000 euro p\u00ebr pak para?<\/a><\/noindex>
\n
Burimi: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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P\u00ebr nj\u00eb njohje m\u00eb t\u00eb detajuar me nuancat e hulumtimit, rekomandoj t\u00eb shikoni n\u00eb raportin e shkenc\u00ebtar\u00ebve<\/a><\/noindex> dhe materiale shtes\u00eb<\/a><\/noindex> p\u00ebr t\u00eb.<\/p>\n