I’ve managed to do reverse engineering of circuit boards using GIMP and rough alignment of layers using images like the one pictured. I want to use images to reverse engineer parts in CAD, but the minor lens distortion of a camera on a phone at ~20cm high on top of a stack of objects to keep it eyeballed flat is not enough. The result is off in multiple planes. There are minor errors in my curves in the transparent CAD part pictured, but the hole pattern is correct. The picture has been calibrated to 20mm against the ruler. Any suggestions on how to make this usable for replicating the ellipse that crosses the holes ±0.05mm?

  • eco@lemm.ee
    5·
    7 days ago

    Flatbed scanner, as someone else said, would be best.

    For a camera take the photo with the highest focal length you can (biggest zoom lens on your phone). Fill the frame as little as possible (distortion gets worse as you get closer to the edges). Both GIMP and Photoshop have filters to remove lens distortion. It would help to put two straight edges, (one horizontal, one vertical) near the edges of the photo. When you remove the lens distortion properly these lines will become straight.

    You could also try photogrammetry to get a rough model to use as a reference.