dllu

8 ms·

91.
by dllu 1y ago
One day I'll muster up the motivation to bring my setup to Roaring Camp to scan those Shay geared locomotives but those moving parts will indeed appear weird and distorted.
92.
by dllu 1y ago
Yeah they have a whopping 300mm f/2.0 lens for photo finish! I have been using various primes including a Samyang 135mm f/2, Voigtländer Apo Lanthar 125mm f/2.5, Voigtländer Nokton 58mm f/1.4, Voigtländer Ultron 35mm f&#
93.
by dllu 1y ago
I've taken a couple of pics from a moving train... Nankai 6000 series, Osaka: https://i.dllu.net/nankai_19b8df3e827215a2.jpg Scenery in France: https://i.dllu.net/preview_l_b01915cc69f35644.png Marseil
94.
by dllu 1y ago
Yeah I actually have it disabled by default since it makes the horizontal stripes more obvious and it's also extremely slow. Also, I found that my vertical stripe correction doesn't work in all cases and sometimes introduces more
95.
by dllu 1y ago
Thanks, I added a section called "Principle of operation" to explain how it works.
96.
Line scan camera image processing for train photography(daniel.lawrence.lu)
449 points by dllu 1y ago|81 comments
97.
Line scan camera image processing(daniel.lawrence.lu)
2 points by dllu 1y ago|0 comments
98.
by dllu 1y ago
Thanks for reminding me of this cool building --- I just updated the Wikipedia article with an infobox and a photo that I took in 2019.
99.
by dllu 1y ago
It was at CVPR 2019, a computer vision conference. I may be biased since I used to work at Ouster, but cost notwithstanding, I would definitely pick the OS1 again for its unparalleled number of points per second combined with low weight and
100.
by dllu 1y ago
I once put an Ouster OS1 on a hat and walked around with it. Pic of me here: [1] [1] https://x.com/ddetone/status/1141785696224477184?s=46
101.
by dllu 2y ago
Anecdotally, using Darktable, I could never get as good of a demosaicing result as using the straight-out-of-camera JPEGs from my Fujifilm GFX 100S. In challenging scenarios such as fine diagonal lines, Darktable's algorithms such as L
102.
by dllu 2y ago
Fujifilm lossy compressed raw still isn't supported after many years [1]. [1] https://github.com/darktable-org/rawspeed/issues/366 And in my experience there has been lots of bugs with Fujifilm raws in d
103.
by dllu 2y ago
Same in German, die Fledermaus. In fact, in English, the word "flittermouse" also means bat [1], although that word is rarely used now. [1] https://en.wiktionary.org/wiki/flittermouse
104.
by dllu 2y ago
Yes basically. Bird lungs are relatively rigid, open at both ends like a tube, and have a one-way flow of air, so they are less prone to pressure-related injuries. Bat lungs are mammalian lungs that expand and contract as they breathe just
105.
by dllu 2y ago
Here's the report [1], written when I was a second year undergrad in 2010. It's very basic. The species identification is based on matching contours of the spectrogram against some template contour. The multilateration was, embarr
106.
by dllu 2y ago
I once did a project to do multilateration of bats (the flying mammal) using an array of 4 microphones arranged in a big Y shape on the ground. Using the time difference of arrival at the four microphones, we could find the positions of eac
107.
by dllu 2y ago
> There's another, more subtle critique of this system: it lacks path independence. This means that if you start and end a drag with your mouse at a particular location, the rotation will depend on the path that your mouse took. Act
108.
by dllu 2y ago
3D printing technology is amazing now. I used to struggle with my ABS prints warping 12 years ago with a PP3DP --- I couldn't even print a giant 3x3x3 rubik's cube that worked. Now there are lots of 3D printers that are essentiall
109.
by dllu 2y ago
Fortunately, modern TVs can disable the sharpening and contrast/saturation enhancements. Since I do a lot of photography and image processing, I am also extremely sensitive to oversharpened halos, so I was a bit worried about that at f
110.
by dllu 2y ago
Anecdotally my house draws 0.4 kW when idle and 0.6-0.7 kW when both my 8K screen and my computer are on. Since my computer draws 0.1-0.2 kW, I surmise that the QN800A doesn't draw 300-400 W total --- maybe 100-200 W. I run my screen o
111.
by dllu 2y ago
Yeah it does emit a bit of heat. I think around one or two hundred watts? I haven't measured it directly. I have a mini split air conditioner in my home office.
112.
by dllu 2y ago
I wish Dell would come out with a refreshed version of the UP3218K that's cheaper and fixes its various little glitches.
113.
by dllu 2y ago
Oh I just emailed them, and their rep Jeremy Postma is very nice and responsive. If you want a cheaper option you could buy an IKEA Karlby Countertop that's 74" x 42" [1] and mount it on the legs yourself. [1] https:/&#
114.
by dllu 2y ago
I was previously working at a lidar company and now I am working at a robotics company providing calibration and localization software to customers using a combination of lidars, cameras, and other sensors.
115.
by dllu 2y ago
I have the Uplift 4 leg standing desk [1]. I got the black laminate desktop in a custom 75" x 42" dimension so the whole thing cost me almost $2000. [1] https://www.upliftdesk.com/uplift-4-leg-standing-desk-v2-v2-.
116.
by dllu 2y ago
I have fairly bad eyesight with both myopia and astigmatism (-5 sph, -2 cyl) and I wear glasses. I got glasses with 1.71 index lenses, which I greatly prefer over the more common 1.74 index lenses due to the higher Abbe number, resulting in
117.
by dllu 2y ago
I actually spent $3500 on mine haha, back in 2021. Early adopter tax...
118.
by dllu 2y ago
What you really need to match is the angular resolution in microradians from your eye. You can make any screen smaller by sitting farther back. That said, I do wish my TV was only 42". I guess if you really want the ppi to be exactly t
119.
by dllu 2y ago
Author here: I use a Logitech G Pro X Superlight but also I use the i3 window manager and rely on keyboard shortcuts for a lot of the navigation. I have the mouse sensitivity set so that the cursor can traverse the width of the screen when
120.
by dllu 2y ago
Author here, ask me anything! Apart from programming, one of the motivations for getting the 8K display is to look at lidar point clouds. For example the desktop background in my post is a lidar map of Bernal Hill in San Francisco, which I&

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