hello everyone
I am working on a project requiring me to produce IR images from a cell phone camera. I understand that in most cell phone cameras, the IR light is filtered out to produce better pictures in the visible light. Does anyone know if this is done by putting a physical filter in of the optical path, or it is removed as an image process?
Also, I managed to open one cell phone I have and it looks to me the camera is a single CCD chip with a glass housing on top of it. Does anyone know if there is any online tutorial to show me how to dissemble the camera if a hardware modification is needed?
a third question, what are the companies that produced these CCDs for cell phones? I am particularly interested in the ones supply for iphone or newer android smartphones.
thanks
I've yet to come across a phone camera which filters out IR.
They're very handy for checking if car plips/TV remotes are working.
I've seen howto's on removing the ir filter on USB webcams. Some are simple "remove this and a little ir filter sheet will fall out" and some require grinding away at the lens and then repolishing. Good luck on your camera project, hope you find out good news like xaccers suggests.
The camera on smartphone is just a single unit with sensor and lens together, disassembling is quite a task or does it even contain the filter?
Try using a TV remote or any other infrared device in front of the smartphone camera.
No,there is no IR filter on smartphone's cameras pal.
Look at this video and see that there is a second light on that Desire HD at the place of the proximity sensor,which emits IR I think.Plain proof that there is no filter.
im am sorry to say that you are all wrong. all digit cameras including cell phone cameras have IR filters.
they are there to reduce IR light not block it. this is why you are able to see flashing IR leds on remotes. by removing the filter though the leds would be far brighter.
IR light washes out images on ccd and cmos sensors the the filters are in place to reduce this effect.
but as once mentioned it will be quite difficult to remove from a mobile sensor as the lenses sit within the autofocus chamber and would probably be damaged during removal.
yup totally correct.. the ir filter is with in the lense/autofocous chamber and will most likely ruin the sensor if you try to remove it. i tried it on the s7. had to buy replacement camera. in older smartphone cameras the ir filter was easier to remove.. lates phone cameras the ir filter is sandwich between lenses chamber an sensor.
Related
I was moving a surveillance camera earlier tonight, and had the video from the camera up on my phone. The camera does not have an IR filter because it has night vision. I was standing under the camera within view of it looking at the video to figure out if it was aimed properly, and notice that the trackpad button thingy was flashing extremely brightly. Look closely at your button, it's not black, it's actually a really really dark transparent blue color.
It was flashing almost like it was designed to be an activity light of some sort. A few things:
- It's BRIGHT. If it's doing this all the time, it has to be a significant battery drain.
- I wonder if there is a way to turn it off.
- Can it be controlled to use an an IR remote? It's not exactly in the right position on the phone to make it convenient to use as a remote. But an interesting thought nonetheless.
Why would they put an IR emitter on the phone and have it flashing all the time?
You can test this yourself by looking at your phone through a digital camera that has a poor IR filter, or the IR filter removed. A Sony camcorder on NightShot mode would be able to see it also. Any nightvision surveillance cam will see it too.
You know how an optical mouse has a red laser on the bottom of it? The one that tracks the location for you instead of a little ball like on the old mouses (mice)?
Same thing.
Yes, I just started my webcam and yes it's a sensor to track your finger when you want to use the trackpad. Also it looks red to the naked eye. If your in a darkroom, and the phone is off, you might be able to see, there was a thread around about this before too.
any chance this thing has enough power to work as an IR blaster? I've seen schematics for pretty simple 3.5mm dongles, but if the hardware is already there it may just be a matter of some soft hacking.
It could be the proximity sensor.
Hi, so here Is the question, it possible to disable OIS (optical image stabilization) somehow ?
In the camera settings, you can only disable the Digital Image Stabilization. But the Optical Image Stabilization is like a system of springs maintaining the camera lens that compensate the physical movement of the phone. So, you can't disable it, it's not software, it's hardware. The only way to "disable" it would be to open your phone, get access to the camera lens, and stuff things around the lens to hold it in place, or something like that.
Meshuggahblast said:
In the camera settings, you can only disable the Digital Image Stabilization. But the Optical Image Stabilization is like a system of springs maintaining the camera lens that compensate the physical movement of the phone. So, you can't disable it, it's not software, it's hardware. The only way to "disable" it would be to open your phone, get access to the camera lens, and stuff things around the lens to hold it in place, or something like that.
Click to expand...
Click to collapse
That's incorrect. OIS is physical, but it's also electronic. It uses data from your phone's accelerometer (and possibly gyro) to determine when the handset has moved, and compensates by shifting the lens slightly using (I believe) tiny electro magnets, all within a fraction of a second. Just Google "how does OIS work?" and you'll find a decent explanation. Whether or not you can disable it is another matter.
As we have received Nokia 8 PRO Cam update globally, some of us not happy with the final application.
There are lots of bug with this new pro app and it is so clear that it had been rushed out to silence us.
Firstly, in landscape mode in order to launch Nokia 8 PRO features you have to go trough settings, swipe up does not work which is ridiculous and it shows they have released the PRO app without real user feedback, only dump software engineers can not notice such bugs.
Secondly, in default settings shutter control is on which makes a lot of noise in dark situations, try to turn it off and you will see much much better result with less noise. It is not a miracle, does not reach the level gcam has achieved but at least , with PRO cam we see less noise.
Considering it's price, I do not except a miracle from Nokia 8, but this little details kills Nokia legacy. I believe, they should listen feedback from users first before they launch any update.
..please? You have no clue how cameras work? You can't beat the physics. It's all about the amount of light being captured by the sensor. Dark situations will always be hard for small cameras, and vice versa crap cameras, can perform well in bright situations if the lens is sharp.
With a faster shutter will have few options to make to even out the exposure:
Open up the lens aperture more. (These small lenses are usually fully open always if not used in bright sunlight, so there is nothing to gain).
Raise the ISO. This is basically amplifying the sensor data, resulting in a brighter image but with increased noise and loss of details. This is what you are complaing about.
Revert back to a lower the shutter speed so more light can be collected. The disadvantage is that you need to hold you camera more still and moving objects will still not be frozen.
Give up and lower the exposure resulting in a darker image. (Exposure compensation)
A fift option is also cheating, adding post process noise reduction, think a bit like anti-aliasing resulting in even more detail loss. Personally I'll take a slightly noisy image any day in favor of a software drawn oil painting without details.
I can't comment the bug, I haven't hit it. I'd rather the Camera app to remember the settings from last session and also some user programmable "presets" would be nice. Or a full Live Bokeh from a short-cut would also work as an work-around just to make an example.
Usually your subject is gone before your camera settings are in place.
Anyway, t best solution for you would be to get a larger sensor and a larger lens so more light can be collected. Seriously, for example a Sony RX1R II would easily beat any cell phone camera out there in lower light.
Back story:
Recently I bought these dirt cheap VR goggles, they suck, but for the time being it's all I have.
I've noticed that having a touch control over the phone was prety usefull, pausing a video, recentering, selecting, etc.
My goggles are basically wide open from the back, meaning the camera, jack, nfc (probably), usb and the Heartrate sensor are not blocked.
That in mind, I remembered that feature where you can take selfies with the Heartrate sensor and tought to myself "Heck this outta be easy!"
Let's start,
I need to use the heartrate proximity sensor to create a touch action in the middle of my screen
I first headed to the "Automate" app as it is quite flexible and simple (yet anoying) to use. To my avail, the sensor was not listed.
Tasker it was then!
Turns out tasker has a %HEART value but I am uncertain if it's even remotly close to what I need. (tasker.joaoapps. com/userguide/en/variables.html)
also one of my problems is, I don't even know how to activate the sensor in the first place.
I don't know anything about developping on mobile but,
Here's what I know:
-Samsung offers the Sensor Extension for developpers, but you need to register to ask for the dev kit via Email and apparently they don't respond to them very often. (developer.samsung. com/galaxy/sensor-extension)
-You can activate and monitor the sensors using the Samsung test menu
By entering *#0*# in the phone/call keypad and going to Sensor.
-Technically, for my purpose I would only want the proximity sensor of the Heart rate sensor but I believe they come in a package.
-I could attempt using NFC or bluetooth, but I guess I prefer to not cary something in my hand.
-I am sort of noob/alright when it comes to programming C++ so I can atleast understand code.
I'm asking for someone to shed some light if this was done before, I might be missing some obvious answer or other 3rd party app
I don't want to ask alot to be honest.
I guess other solutions will be much easier anyway, I just like to break my head thinking about other ways to do things.
Thx.
Now that we have "In screen fingerprint scanners", which is literally a super-short focal length camera taking the picture of your fingerprints, would it not be feasible to have a similar setup for the selfie camera. The region in and around the selfie camera should work as a screen under regular use and switch off when in selfie mode.
Due to the function required for this to work, the screen will have to be OLED or related technologies that can switch off part of the screen with no pixels light up those areas.