and it goes up to 90.9422 slightly when I bumped it to 1080p.. not big$ alpr -p co day-alpr.jpg
plate0: 10 results
- GQU179 confidence: 90.8321 pattern_match: 1
- GOU179 confidence: 82.0099 pattern_match: 1
- G0U179 confidence: 81.5697 pattern_match: 0
- GDU179 confidence: 81.391 pattern_match: 1
- GQU17S confidence: 80.5507 pattern_match: 0
- GQU17B confidence: 79.9154 pattern_match: 0
- GQU19 confidence: 79.8577 pattern_match: 0
- 6QU179 confidence: 79.8406 pattern_match: 0
- GQUI79 confidence: 79.0606 pattern_match: 0
- GQO179 confidence: 78.6427 pattern_match: 1
What was the brand / source / price on that lens. It looks like very good quality so far.yeah Ive got enough zoom to do just one lane of traffic heh.. its a 6-60mm and I'd guess I am about ~45-50mm right now, and its not full road width as it is.. ive moved it a bit to the right from that image as away traffic was leaving the frame and coming back.
the bullet you have is high on my list, but I think i am going to try something like this first: http://www.amazon.com/Univivi-U06R-WideAngle-Lights-Illuminator/dp/B00M3O5ERK
just to see if I can do it a bit quicker and cheaper, for the price and power of your IR I am keen on trying the 940mm just so it remains discrete as it shines at cars.. I am pretty sure this lens will take it and I dont think i need that much power as I do the optics.. so win win?
I've got my eye on the Low Light 2mp version of the Dahua with that same feature as an upgrade to replace the old Dahua in my number plate capture setup. Can ABF be set to automatic so the camera adjusts for focus shift when moving from day to night, or when your depth of field changes due to iris settings, or is it strictly a push the button on the back function?the abf button on the back is auto back focus, open my tablet.. get the focus as good as I can then hit that button and it fine tunes it.. very sweet.
Have you done any calculations on the pixels per metre? Australian standard says 420 pixels per meter for reliable plate recognition. You seem to be gotting pretty much perfect recognition now.just needed more pixels,
If you buy that one you are going to be dissapointed.this picture alone convinces me to try a 940nm,
I doubt it looks anything near that bright to human eyes. cameras even with IR filters tend to let (a lot) more in than human eyes can see in my experience.this picture alone convinces me to try a 940nm
Remember that cam is doing about 1/30 sec shutter in that shot. You are planning to run 1/500. That means that each exposure lets in 6/100ths of the light it does at 1/30. Try setting that same cam to 1/500 and see if you can even make out that a plate is there at all.we are talking about reflective plates here, I dont know how much those range estimates are going to be useful.. i mean attached is my front door cam and its firing up a plate a 125ft away from the camera with its piddily lil wide angle IR.. it dont have the optics to view that far and its parked, but I cant imagine its hard to light up a reflector ~200ft away.
I think that will put you in the ball park, and you can always repurpose it if it isn't quite up to scratch and you need something better.I am willing to go for 850nm, just to be safe..