dllu

6 ms·

61.
by dllu 9mo ago
The gain is fixed. I think the column variation arises from unstable oscillator frequency and maybe some electrical bug/crosstalk between pixels. Not sure exactly.
62.
by dllu 10mo ago
When converting video to gif, I always use palettegen, e.g. ffmpeg -i input.mp4 -filter_complex "fps=15,scale=640:-2:flags=lanczos,split[a][b];[a]palettegen=reserve_transparent=off[p];[b][p]paletteuse=dither=sierra2_4a" -loo
63.
by dllu 10mo ago
Yes, the M4 is still outperforming the desktop 9950X in single-threaded performance on several benchmarks like Geekbench and Cinebench 2024 [1]. Compared to the 9955HX, which is the same physical chip as the 9950X but lower clocked for mobi
64.
by dllu 10mo ago
Thanks, I posted it 4 months ago already: https://news.ycombinator.com/item?id=44996938
65.
by dllu 10mo ago
Old Thinkpads are great! I used to have a Lenovo Thinkpad X1 Carbon Gen 6 with Intel Core i7 8640U, 16 GB of RAM, and 1 TB SSD. I installed Arch Linux on it with Sway.
66.
by dllu 10mo ago
Agreed. On the computer hardware side: * x86 chips can surpass the M series cpus in multithreaded performance, but are still lagging in singlethreaded performance and power efficiency * Qualcomm kinda fumbled the Snapdragon X Elite launch w
67.
by dllu 10mo ago
Marcan (Hector Martin) resigned from Asahi Linux early this year [0]. Asahi Lina, who also did tons of work on the Asahi Linux GPU development, also quit as she doesn't feel safe doing Linux GPU work anymore [1]. [0] https:/&#x2F
68.
by dllu 10mo ago
Apple does tons of optimizations for every component to improve battery life. Asahi Linux, which is reverse engineered, doesn't have the resources to figure out each of those tricks, especially for undocumented proprietary hardware, so
69.
by dllu 10mo ago
It was done with a line scan camera. More on the technique here: https://daniel.lawrence.lu/blog/2025-09-21-line-scan-camera-...
70.
by dllu 10mo ago
These were parked on Hudson Ave, which is a public street, and not inside the fenced area of the depot. So I just walked up to them.
71.
by dllu 10mo ago
Very neat. I recently went to the Waymo depot in Bayshore (Toland St) and snapped a couple of pictures of the new Zeekrs for Wikipedia. [1] https://commons.wikimedia.org/wiki/File:Waymo_Zeekr_Vehicle_... [2] https:&#x
72.
by dllu 10mo ago
The fact that so many people use FFmpeg and QEMU suggest that he is quite good at documenting, collaborating, and at least making his code remarkably clean and easy to follow. This already puts him way ahead of the average silicon valley se
73.
by dllu 10mo ago
The fact that SVG files can contain scripts was a bit of a mistake. On one hand, the animations and entire interactive demos and even games in a single SVG are cool. But on the other hand, it opens up a serious can of worms of security vuln
74.
by dllu 10mo ago
Not banned. In addition to the Chinese lidars I mentioned, the Valeo Scala on Audi cars is 905 nm, and then there are also Ouster (865 nm), Innoviz (905 nm), Livox (905 nm) etc. The large spinning lidar on top of the Waymo Jaguar I-Pace is
75.
by dllu 10mo ago
Really awesome design! It would be wise to replace some of those 3D printed parts with CNC parts, especially for places where a lot of strength is required (eyelets for those Peak Design anchors) or precision is required (lens mount). I mys
76.
by dllu 10mo ago
You seem to be implying that all automotive lidar are 1550 nm but that's not true. While there are lots of 1550 nm automotive lidars (Luminar on Volvo, Seyond on NIO) there are also plenty of 850 nm to 940 nm lidars are used in cars (H
77.
by dllu 10mo ago
Depends on the wavelength of lidar. Near IR lidars (850 nm to 940 nm, like Ouster, Waymo, Hesai) will be focused to your retina whereas 1550 nm lidars (like Luminar, Seyond) will not be focused and have trouble penetrating water, but they a
78.
by dllu 10mo ago
It does have graphics acceleration and you can even play AAA titles with fex [1] since last year. But many bells and whistles still don't work --- for example, the video decoding hardware, proper sleep, etc. Anyway, I've been usin
79.
by dllu 10mo ago
I once considered making a spinning persistence of vision similar to this one specifically for visualizing lidar data from a spinning automotive lidar. The lidar has 128 beams and you could make a spinning array of 128 1D LED displays at ex
80.
by dllu 10mo ago
Velodyne actually donated an HDL-64E to the Smithsonian. [1] https://lidarmag.com/2011/05/21/velodyne-donates-lidar-and-r...
81.
by dllu 10mo ago
The externally spinning Waymo Laser Bear Honeycombs do indeed cause whacking and pinching and occasionally get gunked up with wet leaves and debris. One reason why they are like that is because these have very large fields of view. A cylind
82.
by dllu 10mo ago
Beamforming with a phased array is talked about in the article, but you are conflating two very different types of arrays. You can't form beams with the types of macroscopic arrays I was referring to, since they consist of macroscopic
83.
by dllu 10mo ago
If I remember correctly, the Valeo Scala that's in the Audi cars uses a discrete 16 element 1D array (940 nm diodes + APDs) plus a rotating mirror to scan.
84.
by dllu 10mo ago
The article talks about eye safety a bit in section 4. > a stuck mirror This is one of the advantages of using an array of low power lasers rather than steering a single high power laser. The array physically doesn't have a failure
85.
by dllu 10mo ago
A flash lidar is simply a 2D array of detectors plus a light source that's not imaged. It's mentioned super briefly at the start of section 3 but you're right, I should have gone into more detail given how common and importan
86.
All about automotive lidar(mainstreetautonomy.com)
211 points by dllu 10mo ago|103 comments
87.
by dllu 11mo ago
Mine is a DAS connected to my main workstation [1] that indeed has 96 GB of RAM. [1] https://daniel.lawrence.lu/blog/2024-04-26-small-form-factor...
88.
by dllu 11mo ago
Very sad that HDDs, SSDs, and RAM are all increasing in price now, but I just made a 4 x 24 TB ZFS pool with Seagate Barracudas on sale at $10 / TB [1]. This seems like a pretty decent price even though the Barracudas are rated for 240
89.
by dllu 1y ago
For those who are interested, the Will Evans course on graph drawing [1] covers a lot of cool graph drawing algorithms. Graph drawing is very interesting and many applications get it wrong. I once contributed [2] some small bugfixes to the
90.
Simple Rust Image Viewer(daniel.lawrence.lu)
1 points by dllu 1y ago|0 comments

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