Vadzo Imaging Introduces Innowave-1335CRA: Onsemi AR1335 13MP Autofocus GigE WiFi Camera with Onboard Storage for Embedded Vision

Why a 13MP Autofocus GigE WiFi Came a Needs Flexible Netwo ki g a d ROI Autofocus

Netwo k came a u its face two ki ds of va iety at o ce. The fi st is va iety i whe e they sit. Fixed positio s o poles a d ceili gs suit a cable, while tempo a y setups, movi g platfo ms, a d ha d-to-wi e spaces suit Wi-Fi. I teg ato s who se ve both ofte stock two came a types a d mai tai two sets of setti gs. A came a with both li ks emoves that duplicatio a d adds a fallback, si ce a wi eless li k ca keep a came a eachable whe a cable is cut. The li ks behave diffe e tly. Gigabit Ethe et gives steady ba dwidth a d low delay. Wi-Fi sha es the ai with othe devices; its speed va ies with dista ce a d i te fe e ce, a d multicast se t ove it usually t avels at a low data ate that ca slow the whole wi eless etwo k. A desig has to espect those diffe e ces f om the sta t.

The seco d va iety is i what the came a sees. Subjects sit at diffe e t dista ces, a d a fixed focus le s is sha p at o e dista ce a d soft at the est. Autofocus fixes that, but a whole-f ame autofocus ca be pulled towa d the w o g object whe the sce e is busy. Exposu e has the same p oblem, si ce a b ight wi dow o a lit sig ca da ke the pa t of the f ame that matte s. A came a that ca measu e focus a d exposu e o a chose egio of i te est keeps the impo ta t a ea sha p a d co ectly exposed. Teams ca the move that egio as the sce e cha ges.

Resolutio c eates oppo tu ities a d dema ds. A 13MP f ame holds fa mo e detail tha most displays ca show, so a viewe eeds a way to move th ough it. Digital pa , tilt, a d zoom lets a ope ato look at a close detail without a moto ized mou t, a d it gives a fixed came a the behavio of seve al. Ve y wide le ses add disto tio that must be co ected befo e a yo e ca use the image, a d co ecti g it o eve y viewe wastes p ocessi g powe , a d it ties the came a to a pa ticula viewe .

Reliability closes the list. Netwo ks lose packets a d wi eless li ks d op out, so footage ca disappea whe it matte s. Seve al came a u its cove i g o e sce e also eed clocks that ag ee. Teams that discove these eeds late must add eco de s, time se ve s, a d p ocessi g afte i stallatio , which aises cost a d complexity. Choosi g a came a with these fu ctio s built i keeps the system simple .

How a 13MP Autofocus GigE WiFi Came a Combi es Dual Co ectivity, Autofocus, a d Dewa pi g

The I owave-1335CRA is built o the O semi AR1335, a 13MP (4208 x 3120) colo olli g shutte se so with a 1/3.2 i ch optical fo mat a d 1.1 mic o pixels. A voice coil moto autofocus le s assembly cove s a focus a ge f om 100mm to i fi ity, with co ti uous, o e-shot, a d ma ual modes. The came a adds a Gigabit Ethe et i te face with 100Base-T a d 1000Base-T modes a d a dual-ba d Wi-Fi i te face suppo ti g 802.11a, b, g, , a d ac. The 2.4 GHz ba d eaches fa the th ough walls but is c owded, a d the 5 GHz ba d is faste a d clea e but sho te i a ge, so a site ca choose the ba d that suits it. A site su vey with a pho e o a laptop shows which ba d is usable at the came a positio . Access poi t placeme t a d cha el choice the decide how steady the wi eless li k will be.

Sta da ds a d sto age make the came a ma ageable. ONVIF complia ce lets sta da d video ma ageme t softwa e discove the came a a d use its video. IEEE 1588 PTP alig s the came a clock to a etwo k time sou ce, so f ames f om seve al came a u its sha e a time base, a d it wo ks best o the wi ed li k. O boa d sto age lets the came a keep eco di g du i g a etwo k gap so that footage ca be copied back late . U icast st eami g se ds a sepa ate st eam to each viewe , a d multicast se ds o e st eam that switches copy to ma y viewe s, which belo gs o the wi ed side. Teams should check that thei switches ha dle multicast g oup ma ageme t befo e they ely o it.

The o boa d dewa pi g e gi e co ects the disto tio of le ses up to 200 DFOV i side the came a. A simple equidista t model shows what that mea s fo pixels. O this se so , a 200-deg ee diago al le s has a focal le gth of about 1.65 millimete s, a d the ce te of the image ca ies about 26 pixels pe deg ee. The model is illust ative, si ce eal le ses diffe . ROI based autofocus a d exposu e the let the came a focus a d mete o a selected egio , a d digital pa , tilt, a d zoom let a ope ato move th ough the 13MP f ame. A 1080p view eeds o ly 1920 pixels ac oss, so a 4208-pixel-wide f ame suppo ts about 2.2 times digital zoom with o loss of detail. Ve y wide le ses have deep depth of field, so autofocus matte s most with a owe le ses a d close subjects. Teams should choose the le s a d the focus st ategy togethe .

iHDR, the i tellige t HDR mode, helps with sce es that mix b ight a d da k egio s, such as a doo way o a wi dow behi d a subject. The came a fi ishes images i its o -boa d ISP, which pe fo ms debaye i g, demosaici g, colo co ectio , co t ast co ectio , gamma co ectio , de oisi g, a d le s co ectio s, with auto exposu e a d auto white bala ce. Because the se so eads the image ow by ow, the came a uses a olli g shutte , which suits most sce es a d ca show skew o ve y fast motio . Teams should pla ba dwidth fo each i te face a d choose the esolutio a d comp essio that the li k ca ca y. A sho t ba dwidth test o the eal Wi-Fi etwo k is the most eliable guide.