totozero
14th January 2009, 14:47
Hi all,
I've been wondering if there was a way to reproduce/simulate the black frame insertion technique (aka dark frame insertion in sony's world) ?
So what is it all about ? :
This is something you won't see on the manufacturers' websites, but 120hz lcd panels use a process called Black Frame Insertion (BFI) - I'll explain. As was mentioned, a standard lcd has a 60hz refresh rate meaning each frame is displayed for 16.6ms as opposed to a tube television/CRT where each part of the image is displayed for less than 1ms and is followed by blackness. Most of the ghosting in LCDs with a fast response time is caused by retinal persistence, (think about what happens when you look at a lightbulb and then look away) due to the fact that the image is displayed for so long. 120hz LCDs reduce retinal persistence by halving the time each image is displayed to 8.3ms, but they are still only capable of refreshing the actual image 60 times per second, and the other 60 frames are pure black, inserted after every "real" frame. The result is a smoother looking video.
Now assuming my display can achieve 48hz, would it be possible to create an avisynth script that'd insert a black frame between each video frame ?
For instance in a 24 fps movie, it will be something like the double framerate thingie excepted there won't be any frame interpolation.
I'm just wondering if the refresh rate would B fast enough to
get something cool ?
Most of time, in new LCD TVS/PJS black frame insertion is coupled with motion interpolation (ie motion flow, trumotion or wathever) as refresh rates are improved (100/120/200hz...).
Anyone to write such a script fot relatime testing purpose, pretty please ?
AFAIK, it won't be a tough job for you, skilled people ! :thanks:.
TIA.
I've been wondering if there was a way to reproduce/simulate the black frame insertion technique (aka dark frame insertion in sony's world) ?
So what is it all about ? :
This is something you won't see on the manufacturers' websites, but 120hz lcd panels use a process called Black Frame Insertion (BFI) - I'll explain. As was mentioned, a standard lcd has a 60hz refresh rate meaning each frame is displayed for 16.6ms as opposed to a tube television/CRT where each part of the image is displayed for less than 1ms and is followed by blackness. Most of the ghosting in LCDs with a fast response time is caused by retinal persistence, (think about what happens when you look at a lightbulb and then look away) due to the fact that the image is displayed for so long. 120hz LCDs reduce retinal persistence by halving the time each image is displayed to 8.3ms, but they are still only capable of refreshing the actual image 60 times per second, and the other 60 frames are pure black, inserted after every "real" frame. The result is a smoother looking video.
Now assuming my display can achieve 48hz, would it be possible to create an avisynth script that'd insert a black frame between each video frame ?
For instance in a 24 fps movie, it will be something like the double framerate thingie excepted there won't be any frame interpolation.
I'm just wondering if the refresh rate would B fast enough to
get something cool ?
Most of time, in new LCD TVS/PJS black frame insertion is coupled with motion interpolation (ie motion flow, trumotion or wathever) as refresh rates are improved (100/120/200hz...).
Anyone to write such a script fot relatime testing purpose, pretty please ?
AFAIK, it won't be a tough job for you, skilled people ! :thanks:.
TIA.