[HN Gopher] Heat-assisted detection and ranging ___________________________________________________________________ Heat-assisted detection and ranging Author : bookofjoe Score : 45 points Date : 2023-08-04 19:24 UTC (3 hours ago) (HTM) web link (www.nature.com) (TXT) w3m dump (www.nature.com) | wpietri wrote: | I am very disappointed that unlike radar, lidar, and sonar, this | "HADAR" technology is not an active-sensing technology, but just | relies on passive IR emissions. I was imagining a car driving | around with a big open flame at the front like something out of | Mad Max. | dylan604 wrote: | Somebody is prepping for Burning Man I take it | wpietri wrote: | All I'm saying is that if we're going to have killer robot | cars roaming the streets and interfering with firefighters | [1], we might as well do it properly. | | [1] https://www.theguardian.com/us-news/2023/jun/23/self- | driving... | dylan604 wrote: | Interfering with firefighters is a bit different from | driving around and starting fires though, init? | dharmab wrote: | IR floodlights mounted to the front of trucks is a thing. | Here's an example with photos of infrared lights used on a | smuggling vehicle so the driver could turn the headlights off | and drive by night vision: https://youtu.be/a8Q9Yibblbc?t=626 | Arrath wrote: | Sounds similar to IRST (Infrared Search & Track) as used in | combat aircraft. | MayeulC wrote: | I don't have access, what's the gist? Heat emission then timing | combined with thermal imaging? AFAIK, most *AR methods are active | and rely on timing, but the abstract mentions passive detection. | jcims wrote: | I can't tell what they are doing. It seems like it's merging | visible and thermal imaging to improve segmentation and | identification, then looking up the identified objects for | ranging. No? | | The thermal images in their examples seem to be intentionally | using a wide temperature gamut to reduce the contrast in the | image (and make it look bad). Most thermal imaging solutions will | automatically adjust and give you a much better result. | | Regardless I can see lots of benefits of integrating the two as | basically another color channel. There's a _lot_ of information | available. | Roguelazer wrote: | "Our work leads to a disruptive technology that can accelerate | the Fourth Industrial Revolution (Industry 4.0) with HADAR-based | autonomous navigation and human-robot social interactions." | | Really, though? | cs702 wrote: | Jeez... that reads like poorly written PR. | | It doesn't belong in academic work, no matter how impressive | the authors think it may be. | jonathankoren wrote: | These industrial revolutions are coming faster and faster, and | somehow feel less transformative with each unveiling. I only | know arguably two. I have no idea what the third, let alone the | fourth was. | mcpackieh wrote: | Industrial, chemical, and information. | ben_w wrote: | First: powered tools, mechanised factories, basic but modern | chemical processes. | | Second: mass production, interchangeable parts, reliable | steel, telegraph and other basic uses of electricity. | | Third: computers and everything related to them. | | Fourth: all the buzzwords and not much substantial at this | time -- though when the dust settles, I won't be surprised if | at least _a few_ currently popular things are still seen as | relevant and not merely flash-in-the-pan cultural artefacts | like the 18th Amendment, patent medicine, or Spiritualism. | nine_k wrote: | Most IR cameras work with IR as heat emission. They are useful in | the dark, without revealing the camera. | | Most optical cameras work with reflected light, not direct | emission. The source of light is usually away and at an angle; | this allows for shadows, textures, etc. | | I don't see why an IR camera can't work the same way as an | optical camera, if reflected IR is used; IR photos under e.g. | sunlight look fine enough. | | Radars or lidars work with their own scanning sources of | illumination: microwave, IR, or optical. I wonder if the HADAR | uses its own source of IR; if it does, how different it from a | LIDAR? | | (All these mysteries can be solved for $29, but I'm not yet | curious enough.) | edrxty wrote: | As a note, try to avoid using IR to describe LWIR, there are | many IR sub bands (NIR, SWIR, MWIR, LWIR) and your phone camera | can detect at least one of them. | _trampeltier wrote: | All IR cameras catch also reflected IR. Thats why you have to | know the emissivity to calculate the true temperature. | edrxty wrote: | Yeah go play with an LWIR camera of you really want to | understand the spectrum. For instance, everything becomes a | mirror, you can see yourself standing in front of surfaces | that have better than ~5um surface finish (quite rough sheet | metal and such) and clouds appear hot-ish because while they | are themselves quite cold, they're reflecting LWIR from the | ground, hence why overcast nights are much warmer. | malaya_zemlya wrote: | https://hal.cse.msu.edu/assets/pdfs/papers/2023-nature-heat-... | nine_k wrote: | Thanks! This clarifies _a lot._ | | - They use and combine both optical and LWIR data. | | - They are able to split the IR signal into emissive and | reflected, and thus measure the temperature. | | - Using the spectral information + some ML models, they are | able to identify materials, and paint / augment pictures | using this information. | | That's actually impressive. | mkoryak wrote: | For some pictures | | https://github.com/FanglinBao/HADAR | | and videos | | https://purdue0-my.sharepoint.com/personal/baof_purdue_edu/_... | Animats wrote: | Behind Microsoft paywall. | cududa wrote: | What? I'm not even logged in and can see it. Are you under | the impression you need to pay for a GitHub account to view | things hosted on it? | robertlagrant wrote: | You don't think they're talking about the sharepoint.com | URL? | [deleted] | visviva wrote: | To me, "ranging" means measuring the range to the target | directly, not estimating it from other measurement types | (bearings, for example). Can someone explain if that's what the | authors are doing here? Is it analogous to stadiametric ranging? | I haven't read through this in depth, but I can't figure out what | their method is. | edrxty wrote: | Just because nobody made me sign an NDA for this: there are | satellite companies using this for finding other satellites in | eclipse. It's a pretty brilliant strategy if you want to dock | with something and there's no usable visible light. You can make | markings that appear clearly in LWIR by making dark parts shiny | (see mostly empty space reflected) and light parts matte (see the | thermal emissions of the spacecraft) | visviva wrote: | This is a common approach - besides being robust to lighting | conditions, it's less sensitive to glinting. ___________________________________________________________________ (page generated 2023-08-04 23:01 UTC)