3 ms·
Could you have someone walk towards the camera with a focus test card and form a map between the sensor and the focus data from the lens itself (FFT, etc)? It
by seg_lol 6y ago
Could you have someone walk towards the camera with a focus test card and form a map between the sensor and the focus data from the lens itself (FFT, etc)?
It would be something analogous to the 'learned indexes' paper.
You could then provide any tweening function to give you that focus feeling you need.
http://www.vldb.org/pvldb/vol13/p1162-ferragina.pdf http://www.vldb.org/pvldb/vol13/p1162-ferragina.pdf
https://arxiv.org/abs/1712.01208 https://arxiv.org/abs/1712.01208
- dylan604 6y agoThe problem was that the stepper motor was too slow to do anything worth messing with like this, so I ultimately wound up taking it all apart and reusing the components in other projects. I build different rigs for timelapse motion control so the steppers are perfect, but live action motion really needs the speed a servo can provide. I did take what I learned from that to building a motion control focus puller for time lapse that used the stepper from this test. This rig doesn't need to arbitrarily adjust focus and does a "dumb" move focus ring from point A to point B in predetermined amount of time. Much easier to program.
- seg_lol 6y agoThat sounds really great. I'd like to do that this winter with Rust on Arduino or Rust on a soft-core RISC-V. I have hacked up some PID loops in the past, but nothing using _actual_ math.