Recent content by imog

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    Dedicated License Plate Cam project

    I'm using openalpr successfully with a 4mm 4MP Hikvision DS-2CD2T42WD-I8. It's mounted in a birdhouse, hung next to my mailbox, so about a foot away from the street. The camera I am using is markedly undesirable for LPR - it's a wide angle 4mm lens, most would say it wouldn't work at all. It...
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    IR pass thru Fabric

    Thanks, I will look closer at that and might try it. I've heard of others using fabric for this. I'm concerned acrylic may cause glare, similar to why dome cameras are avoided for LPR.
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    IR pass thru Fabric

    This is brand new, temporary setup at the moment, wires are pinned down but not buried yet at this time. The cam is mounted in the birdhouse hanging from a sheperds hook behind my mailbox - the box in front of the truck here is my neighbors mailbox for reference, so cam is less than 5ft from the...
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    IR pass thru Fabric

    I am interested in purchasing fabric that passes 850nm but appears opaque in visible light. I would apply this to the inside of my birdhouse, covering the hole of the entrance. I know this fabric exists, but I do not know the terminology to identify it or sellers who carry it. I've got a...
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    Infrared focus shift - explanation

    I nailed this down for myself, addressing the focus shift issue on the sd49225t-hn which doesn't support the adjustfocus api setting to set an absolute focus value. To switch modes I'm doing it externally thru a script from my Vera home automation, but any method you want to use to send the API...
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    API focus for SD49225T-HN

    Alright boys, I got the shit. My other approach didn't work using focusfar/focusnear starts/stops, it kept leaving the focus fuzzy after a couple switches between day/night. Hopefully this helps someone else. To switch modes I'm doing it externally thru a script from my Vera home automation...
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    R/C vehicle to pull CAT5 cable through crawlspace?

    You've got existing cable, I'd cut existing cable A at your current starting point, then pull new line + extra cable B from destination where you want the new line coming out, then use extra cable B as fish tape to pull existing cable A back to where it started... Splice it back together...
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    Infrared focus shift - explanation

    I don't have any reason to think that is the case. Furthermore, my requirement is very specific which won't affect most use cases for a PTZ - I am almost at max zoom, capturing license plates at night on moving vehicles about 150ft away. Works great when focussed properly, IR maxed, HLC at 70...
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    Infrared focus shift - explanation

    I appreciate the perspective. That said, I am disatisfied that a $350 Dahua varifocal needs refocused for daylight/IR. Admittedly I'm not qualified to know what to expect, but both my hik ds-2cd2t42wd-i8 have no apparent focus issues with switching and cost less than half as much so I guess that...
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    Infrared focus shift - explanation

    Worth noting this focus value isn't available on some cameras, for example the PTZ sd49225t-hn. It's a big issue for switching daytime/nighttime, as the only focus adjustments are relative, which is really difficult to dial in vs an absolute setting.
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    API focus for SD49225T-HN

    Documentation suggests this cam doesn't have an absolute focus setting. And reverse engineering based on Wireshark transmissions appear to confirm that further (I dug thru all the http post captures while trying various functions looking for any undocumented focus items). For my need, I'm not...
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    API focus for SD49225T-HN

    I checked via Wireshark, while making changes in the web interface, and it is just sending start/stop like you see above to adjust focus. So each time you click + or - on the web interface, it sends a start followed by a stop shortly after. In wireshark, that looks like this, which you can...
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    API focus for SD49225T-HN

    Doesn't work. This causes it to start focussing further away: http://192.168.1.108/cgi-bin/ptz.cgi?action=start&channel=0&code=FocusFar&arg1=0&arg2=1.0&arg3=0 This tells it to stop focusing further...
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    Switch Dahua Day/Night Profile via IPC HTTP API

    For windows 10, you can install the Linux subsystem for windows, then just use curl from a Linux prompt. Works just the same as running a native Linux system.
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    Dedicated License Plate Cam project

    This is what I was missing, google was not locating an installer, just the latest zip files on github which don't include the windows installer. Further googling, having the info you gave me lead me to this page with a link for "OpenALPR Windows Installer". Bingo! I appreciate the help, thanks...
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