Line scan camera image processing

2 comments

• gnabgib 43 days ago
  Discussion (449 points, 4 months ago, 81 comments) https://news.ycombinator.com/item?id=44996938
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  • dllu 38 days ago
    Ah yeah, I recently changed the url scheme for my blog posts, from

        https://daniel.lawrence.lu/blog/y2025m09d21
    

    to

        https://daniel.lawrence.lu/blog/2025-09-21-line-scan-camera-image-processing/
    

    so maybe that's why OP didn't realize that it had already been posted recently. With the older scheme, not only is SEO bad, but it was really hard to remember which date corresponds to which blog post, and people can brute force search for my hidden (unpublished) blog posts easily.
• shrx 40 days ago
  Is the vertical banding due to the camera being unable to have a fixed exposure gain configured? Or just due to slight variances in the sampling times due to unstable oscillator frequency?
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  • dllu 39 days 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.