mmWave radar, you won't see it coming
joshhorne.com
mmWave radar, you won't see it coming
1–10 of 192 posts
Re: mmWave radar, you won't see it coming
#2I've been following and building mmWave radar stuff for a little over a year now and I wanted to write an intro to help anyone get up to speed on how it works, why it's special, and what's been happening in the space.
Re: mmWave radar, you won't see it coming
#3> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate.
Is 5mm resolution not enough to identify a face?
What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo?
The radar sounds even more identifiable.
Edit: Couldn’t you construct a mosaic and have much higher resolution?
And also remove their clothes?
Re: mmWave radar, you won't see it coming
#4man that mmwave stuff built into phones and watches looks great.
Would love to see that on my watch and Galaxy Fold3... less touching but gesture control. Want.
Re: mmWave radar, you won't see it coming
#5> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate. Is 5mm resolution not enough to identify a face? What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo? The radar sounds even more identifiable. Edit: Couldn’t you construct a m…
I worked with mmWave radars previously, but not professionally. In my opinion, it would be quite challenging to extract enough features from the current generation of mmWave radars, such as TI IWR1642 ([1]) which have around 4 receivers and 2-3 transmitters, because the incoming data, while having a lot of temporal resolution is very limited in spatial resolution.
With greater number of antennas something like what you describe is theoretically possible, but becomes cost prohibitive.
By limiting the number of transmitters / receivers, we can have an almost perfect privacy monitoring. For example, it would be possible to detect a attack / a fight in a public bathroom, while not exposing anyone.
1. https://www.mouser.ec/datasheet/2/405/1/swru521c-1954464.pdf
Re: mmWave radar, you won't see it coming
#6> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate. Is 5mm resolution not enough to identify a face? What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo? The radar sounds even more identifiable. Edit: Couldn’t you construct a m…
I worked with mmWave radars previously, but not professionally. In my opinion, it would be quite challenging to extract enough features from the current generation of mmWave radars, such as TI IWR1642 ([1]) which have around 4 receivers and 2-3 transmitters, because the incoming data, while having a lot of temporal resolution is very limited in spatial resolution. With greater number of antennas something like what y…
Temporal res can be turned into spatial res.
Re: mmWave radar, you won't see it coming
#7Challenges to keep devices affordable aside ($3.65 is a lot for a BOM add on), Radar is one of the first non-human senses I’ve had to design for. From an ML perspective it offers significant advantages over static images, being independent from ambient lighting, and sample rates are higher than low cost cameras without ISO noise.
Re: mmWave radar, you won't see it coming
#8So far these applications seem pretty innocuous, but for things like gesture & other control systems, can mmWave be jammed or spoofed?
Re: mmWave radar, you won't see it coming
#9> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate. Is 5mm resolution not enough to identify a face? What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo? The radar sounds even more identifiable. Edit: Couldn’t you construct a m…
You don't need to identify a face; you can identify people by Gait. If you can resolve something as big as a leg you've got enough, as long as you have it over 10 seconds or so.
Re: mmWave radar, you won't see it coming
#10> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate. Is 5mm resolution not enough to identify a face? What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo? The radar sounds even more identifiable. Edit: Couldn’t you construct a m…
tl;dr is that the technology is very very different than a phone camera. So it's not the same as an IR photo. E.g. Google Pixel 4 has a radar chip AND IR dot projector+camera for face unlock. Presumably, if you could do face identification with Pixel 4's radar sensor only they would not have needed the IR tech.
Disclaimer: Work at Google, but not on Pixel 4.