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Line scan camera image processing for train photography

(daniel.lawrence.lu)
448 points dllu | 2 comments | 23 Aug 25 16:09 UTC | HN request time: 0s | source
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its-summertime ◴[23 Aug 25 22:10 UTC] No.44999539[source]▶
> Hmm, I think my speed estimation still isn’t perfect. It could be off by about 10%.

Probably would be worth asking a train driver about this, e.g. "what is a place with smooth track and constant speed"

replies(1): >>44999823 #
1. tecleandor ◴[23 Aug 25 23:05 UTC] No.44999823[source]▶
Maybe an optical flow sensor to estimate speed in real time?
replies(1): >>45004808 #
2. jebarker ◴[24 Aug 25 15:09 UTC] No.45004808[source]▶
Or a radar gun to measure it