digity
Posts: 42
Joined: Tue Oct 16, 2012 11:32 pm

Confused about night vision options on camera module

Sun Feb 01, 2015 7:58 am

I have a model B Pi and the original camera module. If I want day time AND night time surveillance, do I...

- buy some add-on components for the current camera I have
- replace it with another kind of camera module that does both day and night
- buy a night vision only camera module and switch between two PIs where one handles day and the other night

...?

gordon77
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Re: Confused about night vision options on camera module

Sun Feb 01, 2015 8:46 am

1. The normal Pi camera doesn't do IR, so you can't add anythig to make it do it.

2. Yes you can use the PINOIR camera and it will do day and night but the day colours maybe a little odd. You could use the PINOIR and add a filter to block the IR during the day. Search on here where others have experimented with this.

3. You could use 2 Pis, one with normal camera, one with the PINOIR

Note PINOIR can't see in the dark you need IR illumination, eg IR LEDs

digity
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Joined: Tue Oct 16, 2012 11:32 pm

Re: Confused about night vision options on camera module

Wed Feb 04, 2015 7:47 am

http://www.ebay.com/itm/Infrared-LED-Li ... 3ce77f9c35

So those infrared LED lamps are for the regular camera or the NoIR camera?

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DougieLawson
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Re: Confused about night vision options on camera module

Wed Feb 04, 2015 9:50 am

digity wrote: - buy some add-on components for the current camera I have
The Pi NoIR camera is NOT a night vision (photo multiplier) camera, it's a regular cell phone camera with the infra-red filter removed. So to see things in the dark you need to illuminate the scene with IR light (probably lots of bright IR LEDs).

To see things during daylight you need to have an IR filter in front of the sensor or you need to accept that the colours will be odd due to the IR component of daylight that's illuminating the scene.

Using a servo to swing an IR filter out and an IR LED board in front of the lens is possibly the best, cheapest option.

Else using something like http://hackaday.io/project/2847-ivport- ... ultiplexer so that you can have one RPi with a daylight sensor and one NoIR camera and switch between the two at twilight. (That will change the viewpoint by a couple of centimetres.)
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digity
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Re: Confused about night vision options on camera module

Thu Feb 05, 2015 5:55 pm

Then what's the point of NoIR camera? What exactly does this IR LED filter stuff do for cameras that make it so important?

gordon77
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Re: Confused about night vision options on camera module

Thu Feb 05, 2015 6:13 pm

digity wrote:http://www.ebay.com/itm/Infrared-LED-Li ... 3ce77f9c35

So those infrared LED lamps are for the regular camera or the NoIR camera?
The noir camera, the normal pi camera can't see ir, its filtered out.

gordon77
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Re: Confused about night vision options on camera module

Thu Feb 05, 2015 6:15 pm

digity wrote:Then what's the point of NoIR camera? What exactly does this IR LED filter stuff do for cameras that make it so important?
As dougie says the ir filter stops any ir interfering with the normal colours. The point of the ir camera is you can see in the dark with ir leds which aren't visible.

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jbeale
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Re: Confused about night vision options on camera module

Thu Feb 05, 2015 6:58 pm

to add to gordon77's note, IR LED illuminators are much less visible than normal visible lights, but they are not completely invisible if you are looking right at them with a dark-adapted eye. Visually they will appear a dull red color. The longer the wavelength, the less visible it becomes, but also the less bright the image appears on the Pi-NoIR camera because its sensitivity also falls off, reaching zero around 1000 or 1050 nm. So 850 nm LEDs are brighter (both to the camera, and to the human eye) than 940 nm LEDs. Depending on what you are doing, this may or may not matter.

If you want to take pictures in total darkness where no one will ever see your light source even if they are really trying, then you have to use a thermal-IR imager. That is a different and much more expensive class of sensor, than the common silicon-based camera sensors we use on R-Pi, cellphones, etc.

To answer your question about what the IR-block filter does, look at the two pictures below, taken with the same camera. On the left, IR-blocking filter in place, and on the right, no IR-blocking filter (and also an IR-pass filter). Most people like their colors to look like the one on the left :-) and to do that you need the IR-block filter. Every consumer color camera includes one, apart from the specialty items like the Pi-NoIR model.
Image Image

On the other hand, without the IR-block filter you can see how IR-bright the green plants are, something we don't normally see, so it is an interesting effect. The photos were taken with an old Sony TR7000 "Digital-8" video camera which has an IR filter than can be mechanically flipped into or out of the optical path.
http://www.bealecorner.com/trv900/d8/ir/

giulange
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Joined: Sat Nov 19, 2016 3:40 pm

Re: Confused about night vision options on camera module

Sat Nov 19, 2016 3:45 pm

Is there somebody who can explain me how to use this IR led:
http://www.dx.com/p/waveshare-night-vis ... DBzILTYOhA
with the official Rpi-noir camera?

When it is dark the two leds doesn't seem to illuminate the scene.

Thank you very much!

gordon77
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Re: Confused about night vision options on camera module

Sat Nov 19, 2016 5:22 pm

The camera is not the official one and has extra contacts on the mounting holes. You need to find what the leds needs on these contacts, maybe 3.3 or 5v? Try putting 3.3v or 5v to the contact near the photoresistor, gnd to the other contact.
Do this at your own risk!!

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