SnailScanToo or 2

[PM490]

Thanks @friolator. There may be some shrinkage in the film, but the cycle of the movement is about 20 frames and it is a small reel, so it doesn’t correlate to it physically.

@cpixip

I assume that you are referring to the cyclic shift on the left, unstabilized footage?

Yes, the left side is straight out of the HQ file sequence without stabilization. Right side is stabilized with Resolve tracker.

@cpixip

I assume that you are referring to the cyclic shift on the left, unstabilized footage? If so, have a look at the raw image (also on the left) I recently posted in another thread . This cyclic shift is caused by the bad design of my own scanner. Film is advanced by a sprocket wheel taken from an old S8-projector. I think the reason is that the placement of the sprocket have a slight variation which transfers to the cyclic shift seen. There are other issues which might contribute: first, there is a noticeable amount of film between the sprocket wheel defining the capture position, second, the sprockets are smaller than the sprocket holes - so the tension in the film is important

Good pointers to explore. I currently have very little tension, and will look into experimenting with the tension settings. Indeed the movement of yours and the above have a striking similar beat, but I have no sprockets wheel whatsoever.

@cpixip

I ended up designing a sprocket-registration algo - of course, using a daVinci-tracker is also feasible.

I am going down the same route. Thinking about something very simple to provide sprocket position feedback to the Pico first, then do the stabilization in post.
Your posting and shared github implementation are a great starting point.