Taug kev hauv pem teb ntawm txhua lub tsheb hluav taws xob hluav taws xob expo thiab koj yuav hnov360 automotive koob yees duab systemsiv rau ob yam khoom uas yuav luag tsis muaj dab tsi zoo sib xws. Ib qho stitches ntau qhov dav - lub kaum sab xis pub rau hauv ib daim duab saum toj kawg nkaus kom tus neeg tsav tsheb tuaj yeem xov qhov chaw nres tsheb nruj. Lwm qhov yog ntau -channel recorder uas ntes txhua sab ntawm lub tsheb yog li tus neeg saib xyuas lub nkoj muaj cov duab thaum muaj kev thov av. Tib kab lus, sib txawv hardware, sib txawv mov saw, txawv nqi band.
Rau ib tug distributor los yog fleet buyer, qhov ambiguity yog kim. Kev txiav txim tawm tsam qhov tsis ncaj ncees lawm thiab qhov sib txawv tsis tshua muaj tshwm sim ntawm daim ntawv spec; nws qhia txog hnub thawj pawg tuaj txog thiab qhov system koj cov neeg siv khoom kos duab tsis yog ib qho hauv lub thawv. Peb tau zaum ntawm ob sab ntawm qhov kev txiav txim, qhia cov koob yees duab rau kev tsim thiab tom qab piav qhia rau tus neeg yuav khoom vim li cas cov khoom tsis raug xa mus, thiab nws yog vim li cas phau ntawv qhia no cais ob tsev neeg ua ntej lwm yam.
Ob yam khoom uas qhia ib lub npe
Thawj tsev neeg yog ib puag ncig- saib system, kuj hu uancig - saib xyuas (AVM)los yog noog tus - qhov muag pom qhov system. Plaub mus rau rau lub koob yees duab fisheye zaum ntawm pem hauv ntej, nram qab, thiab sab; lawv cov khoom noj yog dewarped thiab stitched nyob rau hauv lub sij hawm ntawm lub sij hawm mus rau hauv ib tug saum toj -down duab siv yuav luag tag nrho rau qis - ceev maneuvering thiab chaw nres tsheb. Qhov no yog cov qauv uas tib neeg feem ntau cov duab, thiab ib qho uas yog lub Hoobkas ua haujlwm - haum rau cov neeg caij tsheb.
Tsev neeg thib ob yog tus360℃kaw lus kaw lus, ntau-channel teeb tsa npog rau pem hauv ntej, nram qab, sab, thiab qee zaum lub tsev nyob uas sau cov ntaub ntawv tsis tu ncua, kev tshuaj xyuas tus neeg tsav tsheb, thiab kev tiv thaiv kev lav phib xaub. Nws feem ntau qhia ntau yam khoom noj ib zaug es tsis yog ib qho stitched overhead saib, thiab nws nyob feem ntau hauv kev lag luam tsheb, fleets, thiab tom qab muag.
Nov yog qhov sib txawv uas txiav txim siab seb qhov twg koj xav tau tiag tiag: ib puag ncig- saib lub koob yees duab yog ib qhotsav tsheb- pabcuab yeej, thaum lub koob yees duab kaw 360℃yog ib qhopov thawj-thiab- saib xyuascuab yeej. Lub ntxiab yog tias tus neeg siv khoom feem ntau yuav nug thawj zaug thaum lawv qhov teeb meem tiag tiag (kev sib cav sib ceg, kev thov thauj khoom, tus cwj pwm tsav tsheb) raug daws los ntawm qhov thib ob. Qhov twg haum yog nyob ntawm seb tus nqi tau tsim nyob rau lub sijhawm ntawm kev ua haujlwm lossis tom qab qhov tseeb, thiab cov lus nug ib leeg ntsiag to rov ua dua tag nrho cov nqi ntawm cov ntaub ntawv.
Sab hauv kho vajtse: tig ob peb lo ntsiab muag rau hauv ib daim duab
Hauv cov ntsiab lus yooj yim, lub koob yees duab 360-degree ua haujlwm los ntawm kev kho qhov txawv txav los ntawm ntau lub kaum sab xis dav, rov ua dua txhua qhov kev pom mus rau hauv lub dav hlau sib koom, thiab khi lawv rau hauv ib qho duab overhead hauv lub sijhawm.
Tshem ob tsev neeg thiab cov npe ntawm cov khoom luv luv: dav -lub kaum ntse ntse lossis lub ntsej muag lub ntsej muag lub koob yees duab ua rau ntawm lub tsheb CMOS sensors, ib daim duab -cov teeb liab processor lossis ECU (hauv tsheb tshiab, ib qho kev sib koom ADAS domain controller), ib qho zaub, thiab cov ntaub ntawv calibration uas khi txhua yam ua ke. Qhov nthuav qhov tsis yog cov khoom. Nws yog software pipeline uas hloov plaub cais, hnyav heev distorted dluab rau hauv ib coherent duab.
Lub raj xa dej ntawd khiav hauv kwv yees li plaub lub zog. Dewarping ua ntej kho qhov tsis sib haum xeeb ntawm lub qhov muag ntawm txhua lub lens. Ib qho kev xav hloov tom qab ntawd reprojects txhua lub thav duab kho rau hauv ib lub dav hlau hauv av, zoo li txhua lub koob yees duab tau saib ncaj nraim. Cov cheeb tsam sib tshooj ntawm cov koob yees duab uas nyob ib sab yog stitched raws ib txoj hlua. Thaum kawg, photometric kev sib raug zoo sib haum xeeb xim thiab ci ntsa iab hla lub koob yees duab kom cov kev sib koom tsis qhia (Edge AI thiab Vision Alliance). Muaj ntau lub tshuab ces txheej rautriggered views: cov zaub cia li nyiam lub nraub qaum thaum rov qab xaiv, lossis ib sab saib thaum qhov taw qhia mus.
Cov kauj ruam kawg yog qhov chaw yuav khoom -pem hauv ntej qhov tseeb qhov chaw nrog phau ntawv. Photometric kev sib raug zoo uas zoo li flawless ntawm thawj calibration tseem tuaj yeem ua rau hauv kev pabcuam. Lub koob yees duab nyob rau pem hauv ntej grille thiab ib tug tucked nyob rau hauv ib daim iav sab lub ntsej muag sib txawv lub hnub raug, yog li lawv muaj hnub nyoog ntawm txawv tus nqi. Vim tias peb khiav qhov ntsuas cua sov thiab kav ntev hauv- tsev, laus peb Sony STARVIS 2 sensors thiab Novatek processors hla -40℃mus rau 85℃ntau yam ua ntej lawv xa nkoj, peb pom raws nraim li cas qhov sib txawv ntawm qhov chaw hauv daim duab stitched. Ib qho kev sib xyaw huv huv hauv ib lub lim tiam qhia koj tsawg heev txog lub lim tiam ib puas.
Cov tsev neeg cov ntaubntawv povthawj qhia txog qhov kawg ntawm qhov kawg, tib lub sensors thiab tib lub lo ntsiab muag dav, tab sis feem ntau hla qhov hnyav stitching thiab taug txhua txoj kab ncaj nraim mus rau lub kaw lus. Qhov ntawd kuj yog vim li cas ntau -channel rigs feem ntau khiav AHD koob yees duab hla coaxial cable: nws yog ib qho pheej yig, muaj pov thawj txoj hauv kev kom txav tau ntau qhov siab - txhais lus pub rau ib lub thawv. Kev lag luam- tawm yog qhov tiag, txawm li cas los xij. Latency nyob rau hauv hnyav dua compression thiab cable-khiav txwv ntev dua- lub log tsheb yog ob qho uas tom feem ntau hauv cov nkoj tsim, uas yog vim li cas nws thiaj them nyiaj kom nkag siab tias lub koob yees duab AHD tuaj yeem ua li cas thiab ua tsis tau ua ntej koj spec ib qho.
Qhov twg pheej yig tshuab poob sib nrug
Plaub hom kev ua tsis tau zoo dua qub cais lub Hoobkas - qib system los ntawm ib qho uas zoo nkaus li zoo nyob rau hauv demo thiab poob sib nrug hauv thaj teb. Qhov txawv yog yuav luag tsis muaj lub koob yees duab suav sau rau ntawm lub thawv.
Pom Seams
Thawj yog qhov pom seam. Txhua lub koob yees duab khiav nws tus kheej nws pib- kis thiab pib-dawb- sib npaug, yog li ob qhov sib txuas sib txuas tuaj yeem tsis pom zoo rau xim thiab qhov ci; tsis muaj kev sib raug zoo photometric, cov duab stitched qhia tau hais tias nyuaj ciam teb qhov twg cov views sib ntsib. Tsav mus rau hauv ib qho chaw nres tsheb thiab qhov tsis sib haum xeeb zuj zus, tsis zoo dua.
01
Parallax Ghosting
Qhov thib ob yog parallax ghosting. Stitching xav tias lub ntiaj teb yog lub dav hlau tiaj tus zaum hauv av, muaj tseeb txaus rau asphalt thiab kab xim xim, thiab tsis yog rau txhua yam nrog qhov siab. Curbs, ncej, thiab cov neeg taug kev nce siab saum lub dav hlau, yog li cov koob yees duab uas nyob ib sab ua rau lawv sib txawv; ntawm lub seam lawv smear, ob, los yog luv luv ploj. Ib tus neeg taug kev ploj mus ntawm txoj kab plooj tsis yog qhov tsis zoo ntawm cov khoom siv kev nyab xeeb.
02
Lub Koob Yees Duab- suav Myth
Qhov thib peb yog lub koob yees duab - suav cov lus dab neeg, thiab ntawm no peb yuav ua qhov tseeb: ntau lub koob yees duab tsis zoo li qub. Lub 4-lub koob yees duab vs 6- lub koob yees duab puag ncig saib kev sib cav tsis nco qab lub ntsiab lus tag nrho: ntxiv cov koob yees duab tsa cov kev daws teeb meem zoo, tab sis txhua tus ntxiv lwm qhov seam, lwm qhov teeb meem sib dhos, thiab kev ua haujlwm ntau dua. Ib qhov dej- ntsuas plaub- lub koob yees duab puag ncig- saib qhov system yuav tawm-ua lub koob yees duab rau lub koob yees duab tsis zoo ib zaug. Dab tsi ntawm daim ntawv spec yuav tsis qhia koj yog li cas dynamically lub kaw lus tso nws cov seams: ruaj seams tawg thaum cov khoom hla lawv, thaum lub tshuab zoo tshawb nrhiav qhov zoo tshaj plaws seam ncej los ntawm thav duab.
03
Calibration Drift
Plaub yog calibration drift. Lub 360 lub koob yees duab lub tsheb tsuas yog qhov tseeb raws li nws qhov kev ntsuas zaum kawg, thiab kev ntsuas txav mus los: kev kho lub tsheb, lub khob nyuaj, ib millimeter ntawm kev hloov pauv, thiab sab saum toj - pom hauv qab mus nkhaus. Factory-fitting systems tau calibrated ntawm cov kab sib dhos; retrofit cov khoom siv tes uas lub nra rau lub installer, uas yog ib qho loj tshaj yog vim li cas tom qab kev muag khoom yuav zoo li phem dua OEM sawv daws yuav. Uas ua rau cov lus nug txhua tus neeg yuav khoom rov qab yuav tsum muab tso rau tus neeg muag khoom tab sis tsis tshua ua: dab tsi re-calibration txhawb nqa tau xa nrog cov khoom siv. Cov lus teb yog dab tsi cais ib qho - lub sij hawm muag ntawm ib yam khoom uas koj installers tuaj yeem sawv tom qab, thiab nws tsim nyog daws qhov kev txiav txim ua ntej, tsis yog tom qab thawj lub khw xa ib chav tsev rov qab.
04
2D, 3D, thiab cov lus nug haum
Ob qhov sib txawv ntxiv ua rau tus nqi thiab qhov nyuaj. Lub 2D system muab rau koj lub tiaj tus overhead saib; 3D system renders tus qauv rotatable ntawm lub tsheb uas koj tuaj yeem pom los ntawm cov ces kaum. Lub 3D version zoo li zoo nkauj hauv qhov kev ua yeeb yam tab sis xav tau kev suav ntau dua thiab kev ntsuas nruj dua kom ntseeg tau, thiab rau cov neeg yuav khoom lag luam feem ntau huv, txhim khu kev qha 2D sab saum toj -down saib ntaus lub 3D tsis zoo.
Lub diav rawg loj yog yuav ua li cas lub kaw lus tau haum, thiab cov lus teb zoo tiag tiag hloov pauv ntawm qhov xwm txheej. Hauv ibHoobkas- haum cov neeg caij tsheb- tsheb qhov kev pab cuam, calibration tshwm sim ib zaug ntawm txoj kab thiab qhov pom ib puag ncig nyob twj ywm huv si rau xyoo, vim tias cov teeb meem nyuaj tau daws cov dej ntws. Hauv kev rov qab ua lag luam tom qab, cov khoom siv zoo ib yam tuaj yeem ua rau poob siab, vim tias tam sim no calibration yog caij ntawm lub installer thiab lub kaw lus yuav tsum muaj sia nyob yog rov qab ua dua - tsom tom qab txhua lub cev kho. Hauv kev lag luam nkoj, tsis muaj ib qho ntawm cov kev txhawj xeeb: ruggedization, 24V kam rau ua, qhov muag tsis pom kev - qhov chaw nyob ntawm qhov ntev ntawm lub tsheb, thiab cov ntaub ntawv kev ntseeg siab tshaj ib daim duab -zoo meej noog- qhov muag pom. Ib lub koob yees duab 360 automotive system spec tuaj yeem ua tau zoo heev rau cov neeg caij tsheb - cov kev pab cuam tsheb thiab qhov tsis zoo rau lub nkoj, tib yam nkauslub koob yees duab thaub qabuas yog zoo meej rau ib tug sedan tej zaum yuav tsis muaj txiaj ntsig ntawm lub thawv tsheb. Rau feem ntau cov neeg tsav nkoj, qhov kev lag luam tawm - tawm thaj av kom meej meej ntawm sab sau cia: cov duab tso siab tau nqa cov ntawv pov hwm ntsuas tau thiab raug cai, thaum chaw nres tsheb - pab overlay ntawm lub tsheb thauj khoom uas tsis tau xov lub chaw nres tsheb nruj.
Dhau qhov chaw nres tsheb: cov nkoj, qhov muag tsis pom kev, thiab ADAS
Chaw nres tsheb yog qhov chaw ncig saib pib, tab sis nws tsis yog qhov twg tus nqi yog tsom. Qhov siab tshaj - tus nqi loj hlob hauv pawg no yog nyob rau hauv kev lag luam tsheb. Kev tswj hwm lub siab ntawm lub tsheb qhov muag tsis pom kev- kev ua raws cai thiab kev lav phib xaub tau hloov pauv360 ib puag ncig saib lub koob yees duab system rau tsheb thauj khoom, tsheb npav, thiab kawg - mais nkojmus rau hauv ib kab -khoom siv nyiaj ntau dua li qhov kev txiav txim siab hloov kho, thiab ntawm cov tsheb ntawd nws rub ob lub luag haujlwm raws li kev nyab xeeb tsis yog kev pab nres tsheb.
Ua ke nrogdig muag -spot detection (BSD), tib qhov kev tiv thaiv ib puag ncig tuaj yeem chij tus neeg caij tsheb kauj vab hauv qhov chaw tsis pom kev ze thiab ceeb toom tus neeg tsav tsheb hauv lub sijhawm kom hnov mob; xaim mus rau ADAS thiab tsav tsheb- saib xyuas kev ua haujlwm, nws dhau los ua ib feem ntawm kev ua haujlwm - pawg ruaj ntseg. Lub framing tau hloov mus rau qhov sib tw, txav ntawm "pab kuv pom" mus rau " ceeb toom kuv ua ntej kuv ntaus ib yam dab tsi," suav nrog lub sijhawm ib puag ncig pub ua rau tsis siv neeg nres ua ntej tus neeg tsav tsheb ko taw mus txog lub pedal, uas yog qhov tshwj xeeb AI- thiab- ADAS kev koom ua ke peb qhia hauv peb qhov kev tawg ntawmAI thiab ADAS koob yees duab hauv tsheb telematics. Rau cov neeg yuav khoom lag luam, qhov no yog qhov chaw uas 360-degree kaw lub koob yees duab kaw lus rau kev lag luam nkoj nres yog qhov yooj yim yuav khoom thiab dhau los ua kev tswj hwm kev pheej hmoo.
Qhov twg lub khw tab tom mus
Cov lej piav qhia vim li cas txhua tus tsim lub koob yees duab tam sim ntawd hauv pawg no. Lub tsheb ib puag ncig- saib kev ua lag luam zaum ntawm kwv yees li $ 4.3 nphom hauv 2025 thiab tau kwv yees kwv yees li $ 7.3 nphom los ntawm 2030, loj hlob ntawm ib nrab - cov tub ntxhais hluas sib xyaw tus nqi, nrog kev thov sib cais ntawm lub Hoobkas- cov kev pab cuam haum thiab cov khoom siv rov qab tom qab (Mordor txawj ntse). Cov txheej txheem sib txawv ntawm cov kws tshuaj ntsuam thiab cov duab tsis pom zoo, tab sis cov teeb liab sib koom ua ke: ob npaug - tus lej loj hlob tus lej thiab qeb uas tau txav mus zoo dhau los ntawm xoob- "cov khoom siv" theem. Kev kwv yees kev lag luam kuj tau muab ib puag ncig- saib kev saws me nyuam hauv kev tsim- ua lag luam tsheb tshiab ntawm kwv yees li ob -feem peb, uas cim cov thev naus laus zis raws li cov khoom siv tseem ceeb es tsis yog tus hwm- nkaus xwb. Hauv qab uas zaum qhov dav dav dav hauv lub koob yees duab tsheb tag nrho, thiab Tier-1 tus neeg muag khoom hauv paus uas suav nrog Valeo, Bosch, Continental, Magna, thiab Denso, uas teeb tsa cov txheej txheem. Qhov txiaj ntsig zoo rau kev txiav txim siab nrhiav khoom tsis yog tus lej xov tooj; nws yog cov qeb tau loj hlob txaus kom muaj cov qib zoo tiag tiag, tsis yog ib lub pas dej tsis sib xws ntawm "360 cov khoom siv" luv nqi los ntawm lub thawv.
Qhov tseeb yog qhov tseem ceeb thaum koj tab tom nrhiav ib qho
Ua ntej ib daim ntawv teev npe, cov lus nug feem ntau cov neeg yuav khoom ncig tsis tau nug ncaj qha: puas yog pob nyiaj siv 360 zoo txaus, lossis koj puas xav tau tsheb- qib? Cov lus teb ncaj ncees yog tias nws nyob ntawm lub luag haujlwm lub voj voog, tsis yog tus nqi qib ib leeg. Rau cov neeg caij tsheb uas nres ob zaug hauv ib hnub, ib nrab ntawm -tier ib puag ncig- cov khoom siv saib feem ntau zoo. Rau lub tsheb thauj mus los tau kaum teev nyob rau ib hnub hauv tshav kub, kev vibration, thiab 24V hluav taws xob suab nrov, cov neeg siv khoom qib - qib yuav nyeem tau zoo ntawm lub rooj ntev zaum thiab tsis ua haujlwm hauv lub tshav pob hauv ib lub caij, thiab tus nqi ntawm qhov tsis ua haujlwm yog rov qab los thiab tus account puas, tsis yog lub koob yees duab rov qab.
Tshem tawm qhov kev lag luam thiab lub suab 360 automotive lub koob yees duab qhov kev txiav txim siab los ntawm cov lus nug uas tsis tshua ua rau nws mus rau nplooj ntawv khoom:
Daim Ntawv Qhia Txog Kev Xav Tau
- Sensor qib thiab kub ntau yam.Nws puas tuav cov duab zoo txij thaum sawv ntxov khov mus rau lub hnub- ci dashboard, lossis tsuas yog hauv chav ua yeeb yam?
- calibration method thiab re-calibration support.Lub teb puas tuaj yeem hloov thiab rov- tsom lub koob yees duab, lossis lub tsev puas siv tau zoo tom qab lub khob? Cov lus nug tob dua, thiab ib qho ntawm cov neeg muag khoom feem ntau yuav tsis tsa ua ntej, yog dab tsi re-calibration tau xa tuaj rau hauv lub thawv piv rau qhov xav tau cov khoom siv hauv Hoobkas.
- Hmo ntuj thiab qis- teeb pom kev zoo.Lub plooj koj pom tsis tau thaum tav su yog qhov ua tsis tiav hauv qhov chaw nres tsheb dim.
- Daim ntawv pov thawj rau koj lub lag luam.E-MARK, CE, FCC, thiab lwm yam tsis xaiv qhov twg koj yuav muag tiag tiag, thiab lub Hoobkas tus kheej cov txheej txheem zoo tseem ceeb npaum li cas: ntau lawm khiav hauv qab IATF 16949 yog dab tsi ua kom lub koob yees duab- rau - lub koob yees duab sib xws nruj hla ntau -channel tsim, batch tom qab batch.
- Channel suav suav nrog rau txoj haujlwm tiag.Cov channel uas cov neeg siv khoom tsis xav tau yog tus nqi thiab qhov ua tsis tiav lawv tsis xav tau.
- Ruggedization rau lub platform.24V kam rau ua thiab cua sov muaj sia nyob cais ib lub nkoj -qib chav tsev los ntawm cov neeg siv khoom rov ntim khoom dua. Nyob rau hauv peb tus kheej ntau lawm peb kho lub supercapacitor thiab thermal ntsuam xyuas raws li cov kab sib faib.
Ntawm no yog qhov ncaj ncees, thiab nws yog qhov sib txawv ntawm cov neeg muag khoom feem ntau yuav tsis tuaj yeem pab dawb: tiag tiag-lub sijhawm noog- qhov muag stitching feem ntau yog Tier-1 thiab tus kws tshaj lij sau npe, thiab ntau yam ntawm qhov ua tau txav hauv B2B ntim tsis yog AVM txhua. Nws yog rugged, zoo-ua ntau-channel 360℃kev pab them nqi thiab kaw cov khoom siv. Qhov ntawd yog sab ntawm pawg uas cov chaw tsim khoom tsom tau txais nws khaws cia, los ntawm lub tsheb - tshwj xeeb haum thoob plaws 9,000-plus pwm, sensors ntsuas los ntawm -40℃mus rau 85 degree, thiab hauv tsev pwm txhaj tshuaj, SMT, thiab ntsuas cua sov hauv qab ib lub ru tsev, tag nrho cov khiav hauv 9 IA batch zoo li 16 units. batch tsib caug. Yog tias koj cov neeg siv khoom xav tau dab tsi yog qhov kev cia siab rau ntau lub kaum sab xis es tsis yog chaw nres tsheb-pab overlay,uas yog qhov kev sib tham tsim nyog muaj ua ntej koj tso qhov kev txiav txim.
Cov Lus Nug
Q: Puas yog 360 automotive lub koob yees duab zoo ib yam li 360 dash cam?
A: Tsis yog. Ib puag ncig- saib qhov system stitches nyob sab saum toj- nqes duab rau maneuvering, thaum lub 360℃khiav ceev cam kaw ntau lub kaum sab xis rau cov pov thawj.
Q: Yuav ua li cas lub 360 automotive lub koob yees duab system tsim ib tug noog tus - qhov muag saib?
A: Nws dewarps txhua fisheye pub, reprojects lawv mus rau ib tug dav dav hauv av, stitches lub overlaps, thiab harmonizes xim rau hauv ib tug overhead duab.
Q: Puas yog ntau lub koob yees duab ib txwm zoo dua hauv ib puag ncig- saib qhov system?
A: Tsis yog. Thaum cov kev pab them nqi tiav lawm, cov koob yees duab ntxiv ntxiv cov seams thiab cov khoom ua haujlwm, yog li calibration zoo tseem ceeb tshaj qhov suav raw.
Q: Puas yog lub koob yees duab 360 zoo ib yam li lub koob yees duab thaub qab?
A: Tsis yog. Lub koob yees duab thaub qab yog ib sab nraub qaum- tig ntsej muag, thaum lub koob yees duab 360 kaw ob peb lub koob yees duab rau hauv tag nrho - ncig sab saum toj - duab.
Q: Vim li cas qee qhov 360 lub tshuab ua kom pom qhov muag plooj lossis dab dab?
A: Kev tsis sib haum xeeb ntawm cov koob yees duab thiab lub tiaj tus - qhov kev xav hauv av stitching ua rau pom cov seams thiab ghosting nyob ib ncig ntawm cov khoom tsa.
Q: Puas yog tom qab kev muag khoom 360 lub koob yees duab xav tau rov ua dua?
A: Yog. Ib qho kev hloov pauv hloov lossis kho lub cev tuaj yeem cuam tshuam qhov pom, yog li re- kev txhawb nqa calibration yog qhov tseem ceeb rau kev txhim kho retrofit.
