The Daredevil Camera • Hacker News Board

Re: The Daredevil Camera

#81

Post by eric_h » Thu, Jun 30, 2016, 1:48 AM UTC

moheeb wrote: post #57

space_fountain wrote: post #48

Earlier quoted context omitted.

Not quite the same thing though. These systems are active. They have sound being produces most likely at a very specific frequency and then listened for so that depth information can be gathered. This instead images the sound that's already out there in the light. It's the difference between lidar and a camera

Sounds to me more like the difference between using the flash or not.

Sort of, except the "camera" can't make any use of "light" generated by anything other than the flash.

Re: The Daredevil Camera

#82

Post by backprojection » Thu, Jun 30, 2016, 1:50 AM UTC

ProAm wrote: post #14

This is the definition of what a 'hacker' is, great read.

really cool. It looks pretty close to the ideas behind seismic imaging.

https://en.wikipedia.org/wiki/Reflection_seismology

Re: The Daredevil Camera

#83

Post by skiningham » Thu, Jun 30, 2016, 1:58 AM UTC

DanBC wrote: post #7

visakanv wrote: post #4

Earlier quoted context omitted.

I wonder how many other cool-ass projects like this are going on that we have no idea about.

Or the pages that give tantalising hints about a project, but there doesn't seem to be a write-up anywhere. https://www.flickr.com/photos/fotoopa_hs/sets/72157611107153... https://www.flickr.com/photos/fotoopa_hs/4082464167/in/album...

I think those Flickr albums are the write-up for how to make a Fotoopa.

Re: The Daredevil Camera

#84

Post by fudged71 » Thu, Jun 30, 2016, 2:06 AM UTC

Artlav wrote: post #71

pizza wrote: post #66

Earlier quoted context omitted.

But you inch closer towards a reality where there are alternatives to the boring normal day job

Sadly, such things don't pay the bills. (Unless i missed some sort of karma/like/wow monetization :) )

You seriously need to consider starting a Patreon[0] campaign. I'm sure many people would be interested to see more from you. There are individuals on there who are making significant salaries based purely on interest from the crowd.

[0] https://www.patreon.com/

Re: The Daredevil Camera

#85

Post by fudged71 » Thu, Jun 30, 2016, 2:13 AM UTC

Artlav, this is an incredible project!

I have an idea for you. You mention that you want to use a webcam so that you can "overlay" this information on top of an image.

What if you could send it directly to your brain?

There is a technology called Brainport[0], which is effectively a 16x16 grid of electrodes small enough to place on your tongue. By feeding electrical impulses through these electrodes, you stimulate the nerves on your tongue. After two minutes of a "champagn bubbling" sensation, your brain rewires the senses from your tongue to your visual cortex and you can "sense" any input.

This technology has been used to give sight to the blind, balance to those with inner ear problems, and sonar to NAVY seals.

It would be amazing if you were the first person in the world to truly "see" sound.

[0] https://en.wikipedia.org/wiki/Brainport

Re: The Daredevil Camera

#86

Post by wbeaty » Thu, Jun 30, 2016, 2:49 AM UTC

Very very cool!

And it's about time someone did it! Yours is the first hobbyist project I've encountered since my own extremely crude ten-dollar version in 1981. No square array or processing, mine was a mechanical scanner-disk: eight LEDs glued in a spiral to an old vinyl record album, each with an electret microphone and and op amp. Spin the disk with a motor at about 6Hz. Wind noise, so add foam to the mics. It worked. A mechanical acoustic-phosphor raster sensor and display screen, where sound patterns caused light patterns. The best part was to hold some headphones near it while playing 10KHz sine wave. This produced interference stripes on the scanning disk! I hoped to build a huge version someday, but somebody beat me to it: Tom Zimmerman, an MIT student who patented the dataglove, then used the money to work at Exploratorium Museum for a year (as Artist in Residence), building a scanning-microphone LED disk about 6ft wide.

Since then we have companies selling DIDSON full-blown video for underwater (with sonic illumination,) also a euro company with a 3D phase-array microphone imager positioned on a ring or a wire sphere. See:

http://www.soundmetrics.com/Image-Gallery/Fisheries/Habitat-...

Heh, the divers appear to be skeletons wearing scuba tanks.

http://www.acoustic-camera.com/en/products/microphone-arrays...

Re: The Daredevil Camera

#87

Post by wbeaty » Thu, Jun 30, 2016, 3:01 AM UTC

Bromskloss wrote: post #11

Yay, a sound-field camera! I've been wondering if such things are made. Should I take the existence of this project as an indication that they aren't? The use case I imagine is finding what part of a machine is emitting a noise, much like how you would use a thermal camera for finding what part of it is running hot.

Search: acoustic camera. They sell phase-array microphones for mapping noise sources. Rather than a plane array, theirs is a sphere.

Re: The Daredevil Camera

#88

Post by icelancer » Thu, Jun 30, 2016, 3:02 AM UTC

ProAm wrote: post #14

This is the definition of what a 'hacker' is, great read.

Agreed. Not just "cool" thing done, but the tenacity, the work ethic, the constant probing.

Re: The Daredevil Camera

#89

Post by wbeaty » Thu, Jun 30, 2016, 3:03 AM UTC

space_fountain wrote: post #48

gene-h wrote: post #44

Earlier quoted context omitted.

Well as it happens there are special sonar cameras out there capable of providing real-time video images[0][1]. The use case here is being able for a diver or ROV to see in murky water [0] http://www.soundmetrics.com/image-gallery [1] http://www.apl.washington.edu/programs/z_DIDSON/Pages/LIMIS....

Not quite the same thing though. These systems are active. They have sound being produces most likely at a very specific frequency and then listened for so that depth information can be gathered. This instead images the sound that's already out there in the light. It's the difference between lidar and a camera

Nope, theirs is the sound-camera, detector array and sound-lens, but with an acoustic floodlight. I think they do use ranging though, so the 2D image is "sound camera" in one raster dimension, and "sonar range" in the other.

Re: The Daredevil Camera

#90

Post by pizza » Thu, Jun 30, 2016, 3:12 AM UTC

Artlav wrote: post #71

pizza wrote: post #66

Earlier quoted context omitted.

But you inch closer towards a reality where there are alternatives to the boring normal day job

Sadly, such things don't pay the bills. (Unless i missed some sort of karma/like/wow monetization :) )

The cynic in me wants to say that bosses tell their talented workers that pursuing personal projects is delusional simply because it keeps the labor cheap!