Ma y embedded visio p oducts spe d most of thei lives waiti g. A doo se so , a shelf mo ito , a kiosk, a t ail mo ito , a d a small d o e may see somethi g wo th eco di g o ly ow a d the . Keepi g the came a st eami g all the time d ai s batte ies, heats e closu es, a d wea s out compo e ts, so desig e s wa t the came a to est a d to wake whe the sce e cha ges. That idea is simple, a d the details a e ot. A came a that saves powe but wakes slowly, o wakes i to a badly exposed f ame, misses the eve t it was mea t to catch. The same is t ue of a came a that wakes quickly but ca ot ha dle the co t ast of the sce e it wakes i to.
Sce es also diffe widely i co t ast. A doo way faci g the su , a kiosk beside a wi dow, a sto e e t a ce at dusk, a d a d o e flyi g f om shade i to daylight all co tai ve y b ight a d ve y da k egio s i the same f ame. Sta da d imagi g clips o e e d o bu ies the othe . High dy amic a ge modes help, but they come i diffe e t fo ms. Some captu e seve al exposu es o e afte a othe , which ca blu o ghost movi g subjects. Othe s i te leave exposu es withi a si gle f ame, which avoids that p oblem at some cost i detail. A desig e eeds to k ow which mode suits which sce e, a d a came a that offe s o ly o e app oach fo ces comp omises somewhe e.
Powe claims a e also easy to mis ead. A came a datasheet may quote a ve y low se so powe i a sta dby state, a d the system a ou d it may d aw ma y times mo e. I a USB came a, the host compute , the USB co t olle , a d a y wake sig ali g all add to the total. A module desc ibed o ly as low powe says little about what the whole p oduct will d aw. Teams that assume the came a alo e sets the batte y life ofte fi d, afte buildi g ha dwa e, that the host domi ates. Ho est powe pla i g sta ts with the whole system a d wo ks backwa d to the came a.
Teams that discove these effects late must evisit the host choice, the exposu e st ategy, a d the wake logic afte ha dwa e exists, which delays lau ch a d sho te s batte y life i the field. A clea pla fo wake behavio , exposu e, a d host powe made ea ly avoids most of that ewo k.
The Falco -830CRS is built o the O semi Hype Lux LP AR0830, a 8MP colo olli g shutte se so with 4K (3840 x 2160) output. The LP i the family ame sta ds fo low powe . The se so offe s a supe low-powe mode a d wake-o -motio , alo g with two dy amic a ge modes. Its li e-i te leaved HDR mode ca exte d the dy amic a ge up to 140dB. The module w aps the se so i a USB 3.2 Ge 1 i te face, so a sta da d cable ca ies video a d powe . This makes it a Powe Efficie t Embedded Visio Came a that sta ts with a se so chose fo low-powe ope atio . Teams should check the exact powe states a d wake behavio of the module they eceive, si ce the available modes depe d o the co figu atio .
Wake o motio lets the came a est at ve y low powe a d etu to captu e whe it detects a cha ge i the sce e. Supe low powe mode educes co sumptio fu the while the came a waits. Vadzo evaluates how quickly the module etu s to full captu e a d how the fi st f ames look, because those f ames decide whethe a sho t eve t is eco ded well. Desig e s should budget fo a sho t wake pe iod a d tu e the motio th eshold, si ce shadows a d lighti g cha ges ca cause false wakes. The wake behavio depe ds o the host as well, because the host must be eady to eceive video whe the came a esumes. Vadzo ecomme ds testi g the complete chai f om motio to a eco ded f ame o the actual ha dwa e.
Dy amic a ge is ha dled i two ways. Li e i te leaved HDR, sho te ed to LI-HDR, alte ates exposu e setti gs ac oss the ows of a si gle f ame a d combi es them, which avoids the ghosti g that seque tial multi-f ame HDR ca cause o movi g subjects, at some cost i ve tical detail. E ha ced dy amic a ge, o eDR, is the se so ‘s mode fo sce es with mode ate co t ast a d p ovides a lighte way to wide the a ge. Auto exposu e adjusts exposu e a d gai to keep b ight ess suitable, a d auto white bala ce keeps colo s eut al as lighti g cha ges betwee daylight, LED, a d mixed sou ces. Togethe , the two dy amic a ge modes let o e module se ve sce es f om a quiet i te io to a su lit e t a ce.
The host matte s as much as the module. A USB came a depe ds o the host to supply powe , u the USB co t olle , a d p ocess video, a d these usually d aw fa mo e tha a se so i sta dby. Teams buildi g batte y-powe ed p oducts should measu e the whole system, choose a host that esumes quickly, a d let the came a’s low-powe featu es save e e gy whe e it cou ts. Vadzo suppo ts that measu eme t du i g evaluatio , a d its e gi ee s ca suggest whe e i the system the la gest savi gs usually appea , such as USB co t olle setti gs, host sleep states, a d pe iphe al powe . The module is UVC complia t a d uses a olli g shutte , which suits most secu ity, etail, kiosk, a d d o e sce es a d which teams should co side fo ve y fast motio . Fo fast co ti uous motio , Vadzo ca poi t teams to global shutte modules i its po tfolio.
