dllu

19 ms·

211.
by dllu 8y ago
Compared to other sensors, lidars are not that prone to interference because: * it only takes 1 microsecond to make a ranging measurement up to 150 m, so your detector is on for a short time * lasers only illuminate a small spot, and the de
212.
by dllu 8y ago
905 nm can also go through the water in your eye (the eye safety limit for 905 nm is maybe 2 times higher than for 850 nm), but Velodyne and many other lidar companies have been using 905 nm for years with no problems. The 2x higher sensiti
213.
by dllu 8y ago
It's pretty illegal to point lasers at vehicles. Many states and countries have laws against that. For example, in California, California Penal Code Section 417.27 (c) No person shall direct the beam from a laser pointer directly or in
214.
by dllu 8y ago
Not very dangerous. The Ouster OS-1 in the article, as well as all other automotive lidars that I know of, are class 1 laser eye-safe, meaning that it is safe even if you put your eye right up to it for hours. The power also decreases drama
215.
by dllu 8y ago
It's a workstation. The following people might make use of all that hardware: * Game development engineer who needs to test games at all graphics settings; * Digital artist who needs to rapidly iterate by creating draft renderings quic
216.
by dllu 8y ago
China also couldn't make a ballpoint pen until last year [1]. I imagine making a modern jet engine is somewhat more challenging than making a ballpoint pen (both endeavours involve making high precision metal parts). [1] https:/&
217.
by dllu 8y ago
I take photos of trains [1] and regularly run into file format limitations as the photos can easily reach hundreds of thousands of pixels wide. Besides, modern cameras such as the Sony a7R II are already producing photos 8000 px wide, and t
218.
by dllu 8y ago
You are right that per-pixel noise mainly depends on pixel size (most digital cameras are shot noise limited at high ISO). However, we should be comparing images at the same size, rather than at 100% pixel crops. If you print the high resol
219.
by dllu 8y ago
Yes, but only somewhat. A speedbooster is not optically perfect and may degrade image quality by introducing aberrations.
220.
by dllu 8y ago
I tried making a self-solving rubik's cube in 2013 as part of a school project [1]. It didn't quite work and I gave up. [1] https://daniel.lawrence.lu/engineering/cube/
221.
by dllu 8y ago
> below a certain speed Sure, easy thresholding on speedometer data. Gimme a few hours. > ... and check if there are pedestrians closer than a certain distance I'll need a research team and five years. [1] [1] https://
222.
by dllu 8y ago
There are many EU lidar companies. SICK, Ibeo, Pepperl+Fuchs, Osram, Innoluce, Blickfeld, and so on. However, none of those matches the capabilities of the Ouster OS-1 exactly.
223.
by dllu 8y ago
It would not affect the eyes of pedestrians. The Ouster OS-1 in the article, as well as all other automotive lidars that I know of, are class 1 laser eye-safe, meaning that it is safe even if you put your eye right up to it for hours. The p
224.
by dllu 8y ago
The light from the flash spreads out with the inverse square law, so you get much less signal compared with collimated laser beams. To compensate for that, you need much higher power. To get more power without blinding people, you need to u
225.
by dllu 8y ago
First, the optics are not wideband. It is only collecting narrow band NIR light. Saturation is not a problem. The CEO of Ouster explains this in a reddit comment [0]: > We are not sacrificing lidar performance by adding ambient imaging f
226.
by dllu 8y ago
Relevant discussion with some comments from Angus on reddit: https://www.reddit.com/r/SelfDrivingCars/comments/9c60pe/the...
227.
by dllu 8y ago
Estimating depth and 3D bounding boxes using cameras only, while possible, is much less accurate than using actual range data from a lidar. On the other hand if you fuse lidar and camera data such as with Waymo and others, there may be issu
228.
by dllu 8y ago
Every self driving car company is using neural networks. If neural nets are going to be used anyway, I'd rather have centimeter level range information per pixel than not. By the way, although the article focuses on deep learning, ther
229.
by dllu 8y ago
I own the Bose QC25 and have never really been happy with its capability to block human voices. Perhaps the QC35 are better. I also read that the Sony noise cancelling headphones (MDR-1000x and successors) have eclipsed the Bose ones in noi
230.
by dllu 9y ago
Fish is really great for using it in your terminal. Autocompletion, fuzzy matching, and so on, are amazing. Unfortunately, although it is fully scriptable, writing scripts in Fish feels a little clunky at times. For example, I wanted to tes
231.
by dllu 9y ago
Google tried a similar thing to Free Basics with the Google Free Zone [0][1]. It launched in 2012 and disappeared from most places by 2013. [0] https://en.wikipedia.org/wiki/Google_Free_Zone [1] http://web.a
232.
by dllu 9y ago
Some organizations such as the Wikimedia Foundation, Google, and Facebook believe that their services are more important than others. As such, they consider themselves deserving of cheaper, free, or the "fast lane" internet, espec
233.
by dllu 9y ago
It is also interesting to read about the cable cars of Chiatura, Georgia, a small mining town that produces manganese. As of 2013, 17 of the aging tramways were in service. https://www.theatlantic.com/photo/2013/08
234.
by dllu 9y ago
I'm pretty sure it's still a spinning lidar. Nowhere in the official press release [0] did it say it's solid state. Moreover, a recent Verge article [1] says that Velodyne is shifting attention away from solid state lidar to
235.
by dllu 9y ago
The Velodyne VLP-32A Ultra Puck was announced in April 2016 [0] and is only starting to appear on GM Cruise Automation cars since a few weeks ago. There's still no way for the vast majority of people to buy it yet. Likewise, for the VL
236.
by dllu 9y ago
I don't see how you can say millimetre wave radar "does the job many times better". State-of-the art 79 GHz automotive radar: 0.2 m range uncertainty, 5 degree azimuth angular uncertainty, dozens of points per second. Spinnin
237.
by dllu 9y ago
Some vending machines in Japan are designed to give out free drinks during an emergency [0]. That could be one of the reasons why there are so many well-maintained vending machines everywhere, even in remote areas. [0] http://www
238.
by dllu 9y ago
They're working on improving seawalls and rock slopes. [0] [0] http://www.straitstimes.com/singapore/as-sea-levels-rise-sin...
239.
by dllu 9y ago
It seems Triplebyte just tests everyone on web technologies regardless of role or experience. It makes sense that C++ engineers are less familiar with large scale web apps, but are valuable hires in the industry for robotics, finance, game
240.
by dllu 9y ago
Regardless of whether it's true or not, the title is a great example of the "no true Scotsman". [0] A: We built the first real self-driving car. B: What about the Waymo car? A: That's not a _real_ self-driving car. [0]

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