Search results

  1. C

    DIY cheap IP cam with Sony IMX322 ?

    Thanks for the reply. I assume the dome / bullet versions claiming that chip are probably using the same board inside, but maybe there may be some firmware difference, etc? Buying from ebay or aliexpress always seems like a blind leap of faith. I liked that one vendor in my first link had a...
  2. C

    DIY cheap IP cam with Sony IMX322 ?

    Has anyone tried using one of the cheap IP camera modules on aliexpress such as IPCam (1080P) 2.8mm LEN 1/2.8" SONY IMX322 + Hi3516 CCTV IP camera (built in IRC filter) + Audio-in Surveillance Cameras from Security & Protection on Aliexpress.com | Alibaba Group I am interested in this model...
  3. C

    Camera for attic

    If there's a window, I presume it's a livable space. But just FYI, on summer days, a closed-in attic can get pretty hot, I have read up to 160 F which might not be good for the camera.
  4. C

    Hikvision Dedicated License Plate Reading

    Of course you should do whatever is appropriate to your situation. I was thinking about some place like the rural road I grew up on, where you might even see an extension cord simply run right over the road surface (!) from a house to a barn, to keep the hog watering trough from freezing, etc.
  5. C

    Hikvision Dedicated License Plate Reading

    However, if you managed to get power to it somehow, it would have a good view of your own house, and anyone approaching it. Maybe not good enough to cross under a road, but you can use a garden hose with a jet nozzle to tunnel under sidewalks and driveways: Shop Orbit Black Tunneling Kit at...
  6. C

    Hikvision Dedicated License Plate Reading

    If you want a low-profile camera, it might be good if it was somehow combined with that light fixture. At night it would be nearly impossible to see due to glare from the light itself. During the day, it might escape notice if it blends into the design of the fixture.
  7. C

    Camera type suggestion!

    My understanding is CAT5 uses 24 gauge wire and CAT6 uses 23 gauge. If all else is equal, that means the CAT6 will have about 80% of the voltage drop of CAT5 for a given current. If DC voltage drop was the only limit, that implies CAT6 could go 25% farther distance than CAT5 (assuming the...
  8. C

    video analytics for everyone

    You're thinking like I'm thinking :). I'd like to get a "current status" page of thumbnails which show just those things, where the thumbnail is selected for the clearest view. Much better than simple motion detection. I think these new CNN programs watching a video stream could make a pretty...
  9. C

    video analytics for everyone

    The project page is more about research than actual production use, the code I think just for demo. But it seems to be open-sourced so if you wanted, you could probably modify it to work with multiple input streams. GitHub - pjreddie/darknet: Convolutional Neural Networks "Darknet is an open...
  10. C

    video analytics for everyone

    I guess the higher-end cameras have this built-in already, but it's kind of cool you can do it yourself on a Linux box using any image (but slowly, unless you have a serious Nvidia GPU). It's a convolutional neural network (CNN) trained to detect many different kinds of things in images. I'm...
  11. C

    camera countermeasures, but a little bit late

    Have to wonder what this guy was thinking when he stuck his face right up to the camera, as he was putting the tape over it. Viewer Video: Man steals mail from San Jose apartments
  12. C

    Dahua Ultra Starlight Varifocal Bullet (IPC-HFW8232E-Z)

    Thanks for doing these reviews, I know this stuff takes a lot of time. By the way, notice the appearance of the moving legs from 0:11 to 0:16 in this video. This is what I noticed on my "Eco-Starlight" also; small dark moving objects are affected by the noise reduction. The bigger-sensor camera...
  13. C

    Reboot camera every week. Good idea?

    I recently noticed both Dahua camera models I have came by default set to reboot themselves once a week, in the early morning hours. So far I haven't had any problems with either type, but it seems possible that 30 seconds of dead time might be important some day. Just wondering, do people...
    • cam235
    • Thread
    • weekly reboot
    • Replies: 3
    • Forum: Dahua
  14. C

    ALPR: anyone have a 100mm lens they like?

    I'll try to get a picture when it's daylight. Without the optional lens hood, the camera + adaptor + lens is about 8.5 inches long. The front filter thread is 52mm. The Nikon is somewhat smaller than the Canon lens I was using before. If your range is only 150 feet, the field of view of the...
  15. C

    ALPR: anyone have a 100mm lens they like?

    BTW, here's an example using the Dahua 4MP box cam with Nikon manual 100mm lens +C-mount adaptor. The lens is wide open at f/2.8 and this van is about 250 feet from the camera. The white "STOP" pavement marking is 330 feet away. Right now I record only 1280x720 resolution to reduce backend...
  16. C

    ALPR: anyone have a 100mm lens they like?

    In my state both front and back plates are required, but that is seldom enforced based on what I see. Most new cars here have no plates at all (allowed for 90 days after sale, until a new law takes effect in 2019). Plus some plates are dirty or otherwise unreadable. I'd say it's a good idea in...
  17. C

    ALPR: anyone have a 100mm lens they like?

    FYI, in case anyone else wants to do something similar. I wanted to try a lens with manual adjustable iris, so I got a used Nikon f/2.8 100mm Series E lens, plus Nikon F mount to C adaptor. This works pretty much as well as the Canon lens, at lower cost. I ended up leaving it open (at f/2.8)...
  18. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    Four images for comparison. Wide and Tight, with Internal IR On (manual: 100%) and Off. From the tone of the car in the driveway in the two "no IR" images, it looks black zoomed in, but is gray in the wide shot. So like most lenses, this lens gets dimmer as it is zoomed in. All photos same...
  19. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    In this position, the internal IR lights up the lawn in the foreground, and the taillights on parked cars even across the street, but relatively little effect on skin or clothing in the position where I'm standing, which is about 50 feet away from the camera. That is what I'd expect, since they...
  20. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    I may be asking too much of it. I've got the internal IR turned off to avoid bugs etc. As you see from the shadows I have some IR spotlights mounted on the garage where the camera is looking, Nearly but not quite fully zoomed in, 1/30 sec, Manual, Gain 0-20, 3D NR Off. H.264 CBR 10 FPS, 4096...
  21. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    My unit finally arrived. It looks better in low light, but it's tricky to compare these cameras when the exact noise-reduction settings make such a huge difference. I thought I had a great image with everything static, Manual, 1/30 sec, Gain 0-50 and 3D NR ON. Then someone walked by, and it was...
  22. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    I got notification my HDW5231 is being shipped, after a month of waiting. EDIT: I see the news already popped up here as I was typing it. Thanks for the updates.
  23. C

    door checkers caught

    To clarify- the PIR sensors trigger on changes in heat. If the sensor is pointing only at the garage, it won't see the headlights shining on the garage, because the garage hasn't been heated up by them. But if the sensor has a view of the road it will see the headlights, because the headlight...
  24. C

    IR Cannon w/Adjustable Focus

    Mine's still OK, but it's only been running for 1 month, and it's cold outside now. I assume failures would happen more in summertime due to heat.
  25. C

    door checkers caught

    Thanks for the tip. I just got an Optex LX-802n and it will reliably detect me walking by slowly at 60' away in the default ("medium") sensitivity setting. The pattern is really tight, so I can avoid the plants to one side that always wave in the breeze. More expensive than what I had before...
  26. C

    (on sale for $234) FLIR TCX T4325BN Thermal IP camera

    The demo video for that PathFindIR II camera is pretty impressive. A bit pricey for the typical consumer but I assume prices will come down further with time.
  27. C

    Feed two PoE cameras with one network cable

    Nice tip about fully utilizing the 8-conductor cable. I'm curious about your FLIR T4325BN camera, which I gather has a resolution of 80 x 45 pixels. Does that give you a useful image?
  28. C

    ALPR: anyone have a 100mm lens they like?

    The lens works fine without auto-iris. I guess most security cams except for box-cams have fixed iris. The camera compensates the exposure by using a shorter exposure time during the day. It is true, wIth most lenses you only get the best resolution somewhat stopped down, but as you can see...
  29. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    The Starlights are good cameras, but while we wait for availability you can still make do with earlier models the old fashioned way: add a lot of light to the scene. It's easier if you have a fairly narrow angle of view, you can choose more focused fixtures that make a given number of watts go...
  30. C

    Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)

    I tried to order a HDW5231R-Z from aliexpress (BEC Technology) on Nov.22, but no shipment yet. Today got this note: "i just have a bad news to share here, the HDW5231R-Z now having a little delay, dahua reply there has some problem for the chips of the batch they are producing. They are solving...
Top Bottom