|
Author
|
Topic: Surely... If not why not? (compositing/rotoscoping Q)
|
potmonkey
|
posted 11-30-2000 09:04 AM
I have some footage of my background, then some of the the same, with my actors. Surely it would be possible for a computer out there to recognise that the bg is not changing, and therefor remove it for composition. If not, why not...?
I know that some Video Conferencing things condense the amount of video that is sent down the phone line by only updating what has "moved" so isn't there anything along these lines that can be applied to video?The reason I am asking this is because I have some timelapse footage, and some with the actor walking and interacting with this bg. I would really love to combine the two - and have a timelaspe environments with a real time actor. |
Venom
|
posted 11-30-2000 10:21 AM
yes a super computer called r2 d2. no but seriously I mean the Computer core of the star ship enterprise.......no no
seriously i am not sure, how, unless the background is neutral colour, its usually to busy, to much going on still or moving......computer just cant grasp something and remove some other stuff with out some distortion if at all posible. if the background was a simlar toning in colour perhaps but your actors would be come choped up 2...so no its proberly unlikely.....have you tried a Holodeck set up. Well it is available in about 3 to 4 hundren years.... |
TerryGilliam
|
posted 11-30-2000 10:27 AM
Hi potmonkey,
it is possible to remove the background. It's called "Difference Keying". The problem is, your picture needs to be quite good. If your footage is very grainy (e.g. filmed at night) the keyer won't produce good results at all, because the grain will be treated like other moving objects.
AfterEffectsPro and other expensive Software can do this.------------------
*** sorry for my bad english *** |
potmonkey
|
posted 11-30-2000 10:38 AM
Thanks! I'll try to look around for that... if not, I'll wait a couple hundred years :-) |
EricM
|
posted 11-30-2000 01:27 PM
Yes, a difference matte is what you're thinking of. Whatever program you use, there should be a tolerance setting to compensate for grain. However, difference mattes are not that good. Since it works on differences between the empty BG and the BG with your actors, if your actor has a dark shadow on any part of him (black) and he's standing in front of a part of the background that also has dark shadows, then the computer can NOT tell them apart and the person will have a hole in him.
Expect to do a lot of fixing up by hand. |
potmonkey
|
posted 12-01-2000 09:15 AM
I see.. Thank you. |
