dllu

16 ms·

181.
by dllu 7y ago
An interesting read regarding gradients and color palettes is the concept of perceptual uniformity. 1. http://www.hsluv.org/ 2. https://programmingdesignsystems.com/color/perceptually-unif...
182.
by dllu 8y ago
The lidar device is not capable of running SLAM yet. We run SLAM on a computer with an Intel Core i7 processor and currently have not open sourced the algorithm.
183.
by dllu 8y ago
Ouster SLAM works okay in a forest environment, such as driving with one Ouster OS-1 at highway speeds in Tahoe [0]. It is definitely much more challenging than an urban environment full of flat planes and right angles. Calibration, includi
184.
by dllu 8y ago
I'm the author of this blog post. You are right that the SLAM dead reckoning trajectory will drift. We are developing a mapping back-end where we register trajectories to consumer-grade GPS data, performing loop closure, and then doing
185.
by dllu 8y ago
The video is pretty good. If you want to make it even easier for people, you could try a set of "tumblr-style" extremely short animations/videos, 2 seconds each, without sound, and with a written description of each. For exam
186.
by dllu 8y ago
As they say... there are no good moves in Go/chess/zero-sum games etc. There are only bad moves. That doesn't prevent professional players such as Gu Li 9p from describing it as a divine move though. And it does feel good for
187.
by dllu 8y ago
Most human APM is wasted on "spam clicks". The effective APM, or EPM, is probably quite a bit higher for AlphaStar than for human pros.
188.
by dllu 8y ago
TLO is to Starcraft* as Fan Hui is to Go. They are strong players but not the best. I am guessing that Deepmind knows that the strength of their bot isn't ready to take on the very top players, and wanted to show off against a well-kno
189.
by dllu 8y ago
It is a little disappointing that Mana's win was achieved in part by simply exploiting Alphastar's poor response to the immortal drops by doing it over and over again. In contrast, Lee Sedol's win versus AlphaGo involved prof
190.
by dllu 8y ago
But there IS use building units to counter your enemy's army. In the last live match when Mana won, his immortal archon zealot composition was what sealed the deal in the end.
191.
by dllu 8y ago
Yes, lidars have interference, but much less than radar and sonar. From my other comment [0]: > Compared to other sensors, lidars are not that prone to interference because: > * it only takes 1 microsecond to make a ranging measuremen
192.
by dllu 8y ago
Seems like the Mid and Tele are using Risley prism beam steering, which would explain the hypotrochoid scanning pattern. [0] They try to spin the scanning pattern as being an advantage as you get a more dense sampling if you point at it in
193.
by dllu 8y ago
What makes you think a car just needs one? Many of their videos on the website suggest surrounding your car with a dozen of those sensors with overlapping fields of view.
194.
by dllu 8y ago
The Pentax 645D, introduced in 2010, is a DSLR with a CCD sensor. But yes, it is extremely rare. [1] https://en.wikipedia.org/wiki/Pentax_645D
195.
by dllu 8y ago
Some shortpass filters only block 700 nm to 1100 nm and are not rated for performance above 1100 nm, since the silicon sensor cannot "see" light above 1000 nm anyway (but may be damaged by sufficiently strong amounts of it). So, p
196.
by dllu 8y ago
Oh I see, that makes sense. I wonder if any automotive radars are that powerful.
197.
by dllu 8y ago
It's a Sony ILCE-7RM2 with a 35mm lens at f/4: https://twitter.com/jitrc/status/1083190800710684673
198.
by dllu 8y ago
Radars pointed at each other may have some interference resulting in temporary erroneous readings but they won't be permanently damaged like the camera in the article.
199.
by dllu 8y ago
Interesting free article: Laser-induced damage threshold of camera sensors and micro-optoelectromechanical systems https://www.spiedigitallibrary.org/journals/optical-engineer... Cameras also get regularly damaged at c
200.
by dllu 8y ago
Surveillance lidar is a thing. [1] Quanergy Perimeter Security System https://www.youtube.com/watch?v=IFCgEzdrbQM [2] Quanergy's LiDAR-based security solution https://www.youtube.com/watch?v=PpYDWb2yX_M
201.
by dllu 8y ago
Most current self driving car lidars operate close to the 900 nm range, and they are required to output 1000 times less power than the 1550 nm lidar in this article. [1] So far these seem totally harmless to cameras. 1550 nm lidars for self
202.
by dllu 8y ago
Yeah, there's a bunch of dimensions involving grade separation and such.
203.
by dllu 8y ago
There's an interesting gradation from buses to trains. I made a picture to show this: https://pics.dllu.net/file/dllu-sc/d089a0155a.png Everything on the left of the dotted line can go without rails/guid
204.
by dllu 8y ago
Good weather
205.
by dllu 8y ago
Spatial subdivision with fast indexing on a sphere is quite useful for mapping. We want map tiles to be of close to constant size and shape, and find the tile for any point on Earth. Usually, subdividing the faces of a Platonic solid is the
206.
by dllu 8y ago
That one only has 12 m range. The 2D lidars from Hokuyo, SICK, etc with similar range to the Ouster OS-1 (which has 140 m range) cost thousands of dollars.
207.
by dllu 8y ago
It's often easier to make a small chip and spin it around on a rotating platform than to make a big chip. For a similar reason, rotating line cameras are a thing for panoramic imaging [1]. As the technology matures and become cheaper,
208.
by dllu 8y ago
You're right, I stand corrected. It is just a matter of time before that gets banned as well, though.
209.
by dllu 8y ago
> light on real details If you want more details, Image Sensors World [1] has coverage with more details and links to two patents. > It's unclear if this product works in the time-domain It is a pulsed time of flight direct det
210.
by dllu 8y ago
Relevant HN discussion about that post: https://news.ycombinator.com/item?id=17896942

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