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There is the alternative of Black frame insertion. It loses a lot of brightness, but helps a lot with stuttering at 24 fps. The problem that causes stuttering
by rocqua 3y ago
There is the alternative of Black frame insertion. It loses a lot of brightness, but helps a lot with stuttering at 24 fps.
The problem that causes stuttering is (simplified) that your eye is moving smoothly to follow something on the screen, whilst the image is moving in discrete steps. So when your eyes expect something fixed in side your view, its actually stuttering.
Black frames make use of a natural image retention in the eye. Where you effectively continue to see the last bright thing. Hence what you expect to be stationary in your field of view does remain stationary.
This was actually key to film based projectors working, because they need a period of black to advance to the next frame. Without image retention it would seem to flicker. Though 24 hz is a bit to slow for that, so they actually added a black period (by just blocking the light) in the middle of each frame to even out the effect. They were already doing BFI, not for motion smoothing, but for flicker smoothing. It seems likely this is accidentally why 24hz film doesn't have stuttering whilst 24hz screens do need it.
Personally I care too much about the brightness loss of BFI, but it might be interesting for you.
- thomastjeffery 3y agoThat's not a valid alternative at all, IMHO. It solves a problem, yes, but a different problem than what is solved by interpolation. Black frames resolve ghosting. That's great! I want to see one frame at a time, no more. Motion interpolation resolves jagged motion. Instead of making my brain do the extra work of filling in gaps of motion, it lets my brain see an image move smoothly through time. The higher resolution gets, the larger the group of pixels are that need to be moved each frame. This causes two unique and interdependent problems: 1. Low shutter speed creates blurry images, which makes high resolution worthless. 2. Low framerate creates gaps in motion, which makes high detail painful. The faster the shutter, the more detail is visible. Filmakers are happy to solve this as extremely as they can. New cameras and lenses capture incredibly sharp and bright images with very short frame times. The more detail in motion, the more confusing gaps between frames become. Filmakers (and the industry in general) refuse to increase framerate, so they give us ever increasing gaps instead.
- dontlaugh 3y agoIt helps a little and I prefer lower brightness anyway. But it doesn’t remove the panning judder entirely. Mild interpolation does better.