1901 points l2silver | 1 comments | 27 Apr 23 15:04 UTC | HN request time: 0.247s | source

Maybe you've created your own AR program for wearables that shows the definition of a word when you highlight it IRL, or you've built a personal calendar app for your family to display on a monitor in the kitchen. Whatever it is, I'd love to hear it.

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jo-m ◴[28 Apr 23 08:49 UTC] No.35738987[source]▶

>>35729232 (OP) #

I have a rail line right under my apartment, so I built a small computer vision app running on a Rasperry Pi which records each train passing, and tries to stitch an image of it.

It has a frontend at https://trains.jo-m.ch/.

Edit: it's currently raining and the rain drops are disturbing the images a bit.

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1. CTDOCodebases ◴[29 Apr 23 01:26 UTC] No.35749090[source]▶

>>35738987 #

This is cool. How do you calculate the speed of the train?

I'm assuming you are measuring how far a certain feature of the train takes to get from one point of the frame to the other. Similar to how police catch people speeding by measuring how long road markings take to pass in a given frame.

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