frizensami

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Show HN: TurboAnimator – Google Slides animations with one shortcut(turboanimator.com)
1 points by frizensami 3y ago|0 comments
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by frizensami 5y ago
Ah, I see. Thank you!
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by frizensami 5y ago
Yes, I agree. I believe military-grade optics detection systems use multiple wavelengths, and some even use short bursts of visible light, making it harder to block.
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by frizensami 5y ago
Interesting question. Mainly as mentioned above we needed Google Play Services for AR. Nothing else stands out at a high level. However there is a clear bottleneck with the Google AR team for features that the community really wants. While
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by frizensami 5y ago
Oh, I must have misunderstand, since the root comment was talking about detection methods. But yes, jamming is a good option, and there have been papers to make areas "unrecordable". I don't have my citation manager on hand n
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by frizensami 5y ago
I'm not sure that it's a conclusive yes here. We have a procedure to remove the effects of background reflection saturation by constantly analysing the maximum reflection size. So if there's a large reflection in the scene, w
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by frizensami 5y ago
Funnily enough this is exactly how we started the project, just with a different Thinkpad model. Separately, Lubos, the creator of ToF Viewer, is very helpful to the ToF community and constantly answers any questions about APIs or sample co
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by frizensami 5y ago
Perhaps you could try this direct PDF link at https://dl.acm.org/doi/pdf/10.1145/3485730.3485941 . Hopefully that works.
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by frizensami 5y ago
Agreed. I expect however that any easily available thermal sensing, especially on smartphones (see FLIR, etc), could be easily defeated with a strong adversary doing good thermal management. As you say though, extra heat is a physical guara
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by frizensami 5y ago
There's a lot of marketing involved in this naming, with Samsung calling it DepthVision and Apple calling it LIDAR. There may be a difference here, however. My understanding is that Apple LIDAR is doing what we call "direct"
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by frizensami 5y ago
I don't think so. There's "laser-assisted autofocus" which might be slang for an actual ToF sensor, but sometimes that's just a single laser pulse (I.e., no 2D image that we need).
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by frizensami 5y ago
Agreed, and a very valid point that these off the shelf detectors are pretty cheap compared to ToF smartphones. There are a number of unfavourable things about the detectors though: - No automated detection, so lots of human subjectiveness
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by frizensami 5y ago
It could also possibly work on iOS, but there's a catch we have not yet explored. We're relying on something called the "confidence" score in the ToF camera API, which has 8 possible values (3 bits) in Android, but from
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by frizensami 5y ago
I don't think this works, mainly because an extremely bright external source of 850 nm light looks incredibly suspicious through the sensor (as we expect the ToF sensor to be the only light source). We could add that check in explicitl
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by frizensami 5y ago
Thank you! Hoping for higher resolutions soon.
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by frizensami 5y ago
Thats very interesting, first time hearing of it. Not sure, really depends on what kind of reflection it generates when light hits it, and because of the unique design I'm not sure what that will be.
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by frizensami 5y ago
Yes, perhaps. At the very least, adding a variable shutter and extra logic will drive up the price of the camera, which will be some consolation.
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by frizensami 5y ago
Thank you! Actually, my understanding when I started this project was that I would get a 640 x 480 image (IMX516 sensor). However, I could only get a 320 x 240 image from the sensor through the Android API, so that was a bit of an oddity.
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by frizensami 5y ago
But at least for the larger camera case, we can just increase one of the filtering thresholds for reflection size, which is already doable on the UI
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by frizensami 5y ago
The free option: use your smartphone's flashlight and try to spot unnaturally bright / colored reflection. If you want to spend some money and don't mind carrying an extra device: probably any of the "hidden camera detec
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by frizensami 5y ago
So far the biggest issue is if the camera is angled oddly away from the user (basically, outside the 20 degree observable FoV). Another issue would be if they manage to install a larger camera that returns larger reflections (which we filte
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by frizensami 5y ago
That's a great question. I'm not totally sure if this is possible. If it was, I think one-way mirrors would use this technology. For now, it seems like they only work because they only let 50% of the light through + there's a
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by frizensami 5y ago
While the broader technique should work for those applications, the platform (smartphone ToF sensors) probably won't. Smartphone ToF sensors have a pretty limited range. We were only able to detect cameras within 1 metre of the smartph
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by frizensami 5y ago
I would love to, but I'm not sure how yet without a major re-write. The augmented reality code we completely rely on is part of Google Play Services for AR. I definitely do understand the benefit of degoogling, so maybe it can be a com
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by frizensami 5y ago
Also I appreciate the interest, thank you. I'm heading back from the conference over the next few days, so I should be more free to take a look at it soon.
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by frizensami 5y ago
It's definitely something I'm considering. The only hard blocker now is a hashmap that checks for our test phones' unique ID and applies a fixed transform to align both cameras. Right now, any other phones will cause an immed
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by frizensami 5y ago
That's an interesting idea: trying to create so many false positives that the user gives up. We're already removing around 100+ false positives per frame at the moment in difficult cases, so perhaps it's possible to overwhelm
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by frizensami 5y ago
High priced flagships have them but there are also a few midrange phones like the Huawei P30 Pro that have them too. The trend seems pretty positive towards more ToF sensors in phones, especially because Apple has had them for two iPhone Pr
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by frizensami 5y ago
Pretty interesting idea. In fact, there are a number of military-related systems to spot sniper scopes (generally optics) with lasers, which I expect is similar to what they used here.
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by frizensami 5y ago
Yep, the combination is highly reflective. I cited another work (by a physics research group) in a comment that modelled and tested this effect comprehensively.

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