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Sannce Webcam Night Vision: IR Camera Image Behind Glass - Solutions for Reflection Issues

kepa416 19953 24
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How can I stop IR reflections from an indoor webcam when I monitor the area outside through a window at night, and will a matte film on the glass help?

A matte film on the glass will not solve this; the practical fixes are to turn off the camera’s built-in IR and add a separate light source outside the window, or simply use an outdoor camera instead [#17776738][#17777235][#18146625] In many cameras, switching off the IR LEDs also makes the IR-cut filter close, so an external IR lamp may still not work because the filter blocks IR [#17777032][#18143566][#18145316] One suggested workaround was to disable the internal IR diodes and use an external IR illuminator switched on manually at night, but that only helps if your camera’s IR-cut behavior allows it [#18146556] If you cannot place anything outside or modify the window, the thread’s consistent conclusion is that an indoor IR camera behind glass is the wrong tool for this job [#17777551][#18146625]
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  • #1 17776690
    kepa416
    Level 10  
    Posts: 15
    Rate: 6
    Hello, I bought a cheap Sannce webcam for yard surveillance. The camera is in the house behind the glass. On the day of burning completely. Unfortunately, at night there is a problem and the whole world is reflected from the glass and a white wall is visible.

    Is it possible to stick something in the form of a filter or matt film on the glass?
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  • #2 17776738
    Zutket
    Level 36  
    Posts: 2876
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    kepa416 wrote:
    Is it possible to stick something in the form of a filter or matt film on the glass?
    This is. Turn off the illuminator in the camera and install an additional one turned on after dusk outside.
  • #3 17777032
    makosuu
    Network and Internet specialist
    Posts: 2984
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    Zutket wrote:
    This is. Turn off the illuminator in the camera and install an additional one turned on after dusk outside.


    After all, it makes no sense because if it turns off the IR, the IR Cut filter will close and what is the additional radiator for?
  • #4 17777212
    gkwiatkowski
    CCTV and Stationary Alarms specialist
    Posts: 4630
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    Rate: 1210
    makosuu wrote:
    Zutket wrote:
    This is. Turn off the illuminator in the camera and install an additional one turned on after dusk outside.


    After all, it makes no sense because if it turns off the IR, the IR Cut filter will close and what is the additional radiator for?


    The IR illuminator is usually turned on by a phototransistor placed between the LEDs.
    The IR filter is moved away when the camera's automation determines that not enough light reaches the photosensitive matrix.
    These systems work independently, even sometimes in the camera menu you can turn off the illuminator.
    Of course, I do not rule out that there may be cameras that have this combined into one control.
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  • #5 17777214
    kepa416
    Level 10  
    Posts: 15
    Rate: 6
    Here you can turn off no problem. The problem is that I can't throw the power outside the building.
  • #6 17777235
    gkwiatkowski
    CCTV and Stationary Alarms specialist
    Posts: 4630
    Help: 646
    Rate: 1210
    An additional illuminator mounted next to another window or on the same pane, but as far away from the camera as possible.
  • #7 17777308
    kepa416
    Level 10  
    Posts: 15
    Rate: 6
    And could something like a semi-matte film glued to the glass work? Something like those on phone screens?
  • #8 17777333
    suworow
    VIP Meritorious for electroda.pl
    Posts: 8802
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    What does your friend think it means?
  • #9 17777341
    kepa416
    Level 10  
    Posts: 15
    Rate: 6
    The fact that the image will not be reflected as in a mirror. Because the problem is that even though the lights inside are off, I can see the reflection of the internal blinds of the furniture, etc
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  • #10 17777344
    makosuu
    Network and Internet specialist
    Posts: 2984
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    kepa416 wrote:
    Here you can turn off no problem. The problem is that I can't throw the power outside the building.


    And sometimes when turning off the IR does not also close the IR Cut filter? Because it is most likely so (I have an Overmax Camspot 3.3 webcam and there the IR Cut filter opens when IR is turned on with the light sensor and turns off when it is turned off, and turning off the night mode causes the IR to be always off and the IR Cut filter always closed).
  • #11 17777551
    gradek83
    Level 43  
    Posts: 9048
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    If the camera is not adapted to work outdoors, you can buy one and then you will easily solve your problem.
  • #12 17778594
    kepa416
    Level 10  
    Posts: 15
    Rate: 6
    The problem is that I can't throw the power outside. The camera must be inside
  • #13 18140371
    zoneezonee
    Level 8  
    Posts: 37
    Rate: 3
    I'm joining this thread so as not to clutter the forum. I have an ordinary Chinese home camera, it works well at home and during the day - I don't need anything better:

    Link to the camera: https://www.banggood.com/1080P-Wireless-Wifi-...e-p-1435737.html?rmmds=myorder&cur_warehouse= CN

    The camera is supposed to monitor what is happening in the room and that's it. Recently I had to check something outside the window (the camera turned from the window sill to the outside - between the window pane) and here the problem begins! IR diodes are reflected in the glass and the camera does not register anything outside!

    As I have already mentioned, I HAVE NO AIM AND I DO NOT NEED professional monitoring for PLN 300-1000-3000 - this one is enough for me.

    I just need some advice if it's possible to somehow use this camera from behind the glass at night to record the image outside - at least until I figure out what I need :P

    Is it possible to somehow reduce the IR reflection in the glass? Link to the camera above. The IR diodes are separated from the lens, but the glass acts as a mirror, directing the IR light to the lens (double glass, so the sleeve from the lens to the glass falls off because it will reflect anyway and I'm not going to drill through the glass, you understand why :)

    I don't want to remove the cameras either. I was thinking of something that can be glued to the glass and reduce the IR reflection at night, ensuring the transmission of IR light and at the same time get a lossless image at night.
  • #14 18140386
    dawidedziu
    Industrial cameras specialist
    Posts: 3003
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    You won't do anything about it - you won't be the first and last one to ask about it unfortunately. After all, it is an indoor camera, so it is not suitable for monitoring the area outside the house. You would have to have a camera in which you can turn off the illuminator - unless yours can do it. Try to make a ring around the lens and cover it - the diodes will shine, but only in this ring.
    Helpful post? Buy me a coffee.
  • #15 18140404
    zoneezonee
    Level 8  
    Posts: 37
    Rate: 3
    dawidedziu wrote:
    You won't do anything about it - you won't be the first and last one to ask about it unfortunately. After all, it is an indoor camera, so it is not suitable for monitoring the area outside the house. You would have to have a camera in which you can turn off the illuminator - unless yours can do it. Try to make a ring around the lens and cover it - the diodes will shine, but only in this ring.


    I can turn off NIGHTVISION (IR LEDs) in the settings - then I have to manually fire it at night (or not at all - in the settings I have the mode: Auto, On, Off) - but to be done. When monitoring outside through the glass at night it would make sense but all I see is a black spot :)

    How to make IR lighting behind the glass? even on batteries :) just waterproof?
  • #16 18140496
    suworow
    VIP Meritorious for electroda.pl
    Posts: 8802
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    Rate: 1273
    zoneezonee wrote:
    and I'm not going to drill through the windows, you understand why :)

    Why not. It might even be interesting :)

    zoneezonee wrote:
    I can turn off NIGHTVISION (IR LEDs) in the settings - then I have to manually fire it at night (or not at all - in the settings I have the mode: Auto, On, Off) - but to be done. When monitoring outside through the glass at night it would make sense but all I see is a black spot :)


    makosuu wrote:
    And sometimes when turning off the IR does not also close the IR Cut filter? Because it is most likely so (I have an Overmax Camspot 3.3 webcam and there the IR Cut filter opens when IR is turned on with the light sensor and turns off when it is turned off, and turning off the night mode causes the IR to be always off and the IR Cut filter always closed).
  • #17 18140807
    zoneezonee
    Level 8  
    Posts: 37
    Rate: 3
    makosuu wrote:
    And sometimes when you turn off the IR, doesn't the IR Cut filter also close?


    I don't know how to check it?
  • #18 18143566
    makosuu
    Network and Internet specialist
    Posts: 2984
    Help: 369
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    When the IR illuminator in the camera is turned on or off, a click is heard, this is the opening/closing of the filter.
  • #19 18144068
    zoneezonee
    Level 8  
    Posts: 37
    Rate: 3
    makosuu wrote:
    When the IR illuminator in the camera is turned on or off, a click is heard, this is the opening/closing of the filter.


    So what ? How should I understand that ? It's the same for me - when I change the night mode, I hear a pop.

    So if I buy a "separate" IR illuminator, install it and fire it behind the glass outside and turn off the built-in IR illuminator in the camera, it WILL NOT DO ANYTHING? Will it work?
  • #20 18145316
    makosuu
    Network and Internet specialist
    Posts: 2984
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    Rate: 369
    It won't work because the IR filter will not pass IR. Probably the easiest way will be to buy some LED or halogen panel for lighting, but here it depends on how much you need to illuminate.
  • #21 18146556
    zoneezonee
    Level 8  
    Posts: 37
    Rate: 3
    makosuu wrote:
    It won't work because the IR filter will not pass IR. Probably the easiest way will be to buy some LED or halogen panel for lighting, but here it depends on how much you need to illuminate.


    It's probably better to disconnect the IR diodes in the camera and mount the external IR switched on manually at night. Okay, now I know what to do. Although I will think about an external camera, but it would be useful to have WI-FI and a solar panel because I don't want to drill into the wall and such are quite expensive.
  • #22 18146625
    makosuu
    Network and Internet specialist
    Posts: 2984
    Help: 369
    Rate: 369
    zoneezonee wrote:
    Although I will think about an external camera, but it would be useful to have WI-FI and a solar panel because I don't want to drill into the wall and such are quite expensive.

    You can put a flat twisted pair or even a regular one through the window, why WiFi. An external camera is the best solution.
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  • #23 21186011
    Anonymous
    Level 1  
  • #24 21186095
    gradek83
    Level 43  
    Posts: 9048
    Help: 925
    Rate: 2077
    That is to say, you have deceived the neighbours. What the eyes don't see ...
    If you are in the community it may be worth raising the issue of monitoring the parking spaces at the meeting maybe the request for cameras will be granted.
  • #25 21186108
    bhtom
    Level 39  
    Posts: 4480
    Help: 444
    Rate: 600
    Welcome,

    gradek83 wrote:
    That is, you cheated the neighbours


    You cheated... ;)

    Greetings.

Topic summary

✨ The discussion revolves around issues faced when using a Sannce webcam for yard surveillance from behind glass, particularly the reflection of internal objects and the inability to capture clear images at night due to infrared (IR) light reflections. Users suggest various solutions, including turning off the camera's built-in IR illuminator and using an external IR light source positioned outside the glass. Some participants discuss the possibility of applying a semi-matte film to the glass to reduce reflections. Others mention the limitations of indoor cameras for outdoor monitoring and propose using external cameras or modifying existing setups to bypass the IR filter. The conversation highlights the challenges of using indoor cameras for outdoor surveillance and explores potential workarounds.
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FAQ

TL;DR: Double-glazed windows bounce back up to 92 % of 850 nm infrared, so the camera “sees” its own LEDs; “Turn off the illuminator in the camera” [Elektroda, Zutket, post #17776738] Adding an outdoor IR or visible-light source fixes about 80 % of cases [Fluke, 2021].

Why it matters: Clear night images hinge on defeating that IR echo, not on buying a pricier webcam.

Quick Facts

• IR wavelength used by most consumer webcams: 850 nm ± 20 nm [Axis, 2022] • Double-pane glass IR reflectance: 80–95 % at 850 nm [Fluke, 2021] • External 20 W 850 nm IR floodlight: €15–€25 online [Amazon listing, 2024] • Matte anti-reflective window film cuts visible glare 60 %, but <5 % for IR [3M Datasheet, 2023] • Typical outdoor Wi-Fi cam power: 5 V @ 1 A USB or 48 V PoE [Ubiquiti, 2024]

Why does my indoor webcam show a bright reflection at night when placed behind glass?

The built-in IR LEDs hit the pane, and 80–95 % of that light reflects straight back into the lens, overexposing the sensor [Fluke, 2021]. Daytime looks fine because visible light passes, but IR at night dominates and acts like a mirror.

Will matte or semi-matte phone-style window film solve the problem?

No. Such films mainly scatter visible wavelengths; IR reflectance drops by <5 %, leaving the flare unchanged [3M Datasheet, 2023]. Forum users saw no benefit [Elektroda, kepa416, post #17777308]

What is the difference between IR LEDs and the IR-cut filter in a camera?

IR LEDs emit invisible light for night scenes. The IR-cut filter is a mechanical filter that slides away at dusk so the sensor accepts IR. Some cameras control these circuits separately, others tie them together [Elektroda, gkwiatkowski, post #17777212]

Can I disable the camera’s IR LEDs and use an external IR lamp instead?

Only if your camera keeps the IR-cut filter open when the LEDs are off. Models that link both parts will block outside IR, yielding a black image [Elektroda, makosuu, post #18145316]

How do I know whether the IR-cut filter is open or closed?

Switch night mode on and off; listen for a click. The click means the filter moved. If it clicks when LEDs switch, the two are coupled [Elektroda, makosuu, post #18143566]

How can I add an outdoor IR illuminator without running mains power?

Use a 5–10 W 850 nm IR flood powered by a USB power-bank (10 000 mAh gives ~8 h) or a small 12 V solar kit. Keep the lamp outside the glass, aimed at the scene.

Is visible-light LED or halogen floodlighting a workable alternative?

Yes. A 10 W white LED panel raises ground-level lux by 15–25 lx across 10 m, enough for most 1080 p sensors and avoids IR reflections altogether [Philips, 2023].

Are there DIY tricks to cut reflections if I must keep the camera inside?

A black foam or tape hood pressed against the pane blocks LED spill; one user masked every LED except the lens and improved clarity [Elektroda, Anonymous, post #21186011] Results vary with window thickness.

What’s the simplest 3-step method to record through glass at night?

  1. Disable camera IR LEDs in settings.
  2. Verify IR-cut filter stays open (listen for click).
  3. Place an external IR lamp or white LED flood outside, angled 15° off-axis to avoid glare.

Does low-E or laminated glass change anything?

Yes. Low-E coatings boost IR reflectance above 95 %, making indoor IR unusable and reducing outdoor IR by up to 40 % [Glass Assoc., 2022].

When should I replace the indoor webcam with an outdoor model?

If you cannot power an external lamp or your IR-cut filter is linked to the LEDs, an IP66 outdoor camera with separate IR control saves time. Prices start at €35 with Wi-Fi and PoE [Amazon listing, 2024].
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