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Line scan camera image processing for train photography

(daniel.lawrence.lu)
448 points dllu | 3 comments | 23 Aug 25 16:09 UTC | HN request time: 0.641s | source
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londons_explore ◴[24 Aug 25 17:23 UTC] No.45005958[source]▶
Notable that nearly all cameras can be turned into a line scan camera if you can get your software low level enough to send commands to write the registers on the sensor.

You simply set the maximum and minimum readout rows to be 1 apart, and suddenly your 'frame' rate goes up to 60,000 FPS where each frame is only a pixel high.

You might have to fiddle with upper and lower 'porch' regions to make things fast too.

You must have the line along the long dimension of the image - the hardware has no capability to do the short edge.

replies(1): >>45008194 #
1. decae ◴[24 Aug 25 22:00 UTC] No.45008194[source]▶
How is this possible? What sort of camera can do this?
replies(1): >>45011223 #
2. londons_explore ◴[25 Aug 25 07:24 UTC] No.45011223[source]▶
Almost any camera. Eg. The OV2640.

But you need to have really low level access to registers. Said registers are normally configured by i2c (aka SCCB).

In Linux I think you'd need to patch a driver to do it for example.

replies(1): >>45011610 #
3. decae ◴[25 Aug 25 08:34 UTC] No.45011610[source]▶
That sounds like a lot of fun to play around with, thank you!