View Full Version : HDR movie?
Could we make hdr movies with digiatl camera just like hdrimages? I think it could be done with high enough frame rate and a fast processor. The camera could capture ie:3*24 fps and the processor could mix the images with different level of light, and reduce the frame rate to 24fps.
woud it work?
William_Robinette
01-13-2007, 10:11 AM
Search in the Red forums, I thin this was talked about there. I think the conclusion was, no, it wouldn't work.
Anhar Miah
01-13-2007, 06:30 PM
It would be pointless in my view, HDR images are used to mimic the dynamic ranges values of a particluar environment, and usually the gloabl light values of an environment are pretty fixed.
SomewhereinLA
01-13-2007, 06:53 PM
Well that's pretty much what the RAW format does (somewhat).
It would be pointless in my view, HDR images are used to mimic the dynamic ranges values of a particluar environment, and usually the gloabl light values of an environment are pretty fixed.
but it is nice!
Anhar, you're speaking from a 3D artists perspective ;) and their use of 'HDR.'
It's far from useless for video if you could capture all that information for later mapping to 8bits.
Aaron Marshall
01-17-2007, 03:19 AM
Well that's pretty much what the RAW format does (somewhat).
No, it doesn't work at the level of an HDRi. If you take a shot 2 steps over, and 2 steps under, and then one right on the money you'll have very different curves to blend from shot to shot. A RAW image file is flexible, but not that flexible.
The only way you could possibly get HDR video is shoot with multiple cameras. You could have one dead on target, and two other cameras under and over exposed braced to the sides. Depending on which focal length and distance to subject you used you could mathematically figure out how much you needed to offset the left and right images in post. I bet it could work. I would use straight up 35 or 50mm primes and make sure they were meticulously matched.
It would be neat for a novelty shot or two.
It would be pointless in my view, HDR images are used to mimic the dynamic ranges values of a particluar environment, and usually the gloabl light values of an environment are pretty fixed.
I see your point. But you have to admit, for an effect it would be pretty darned neat. You could shoot a flashback scene, or dream sequence that could feel so eerie and surreal. Pointless? No. Eccentric? Yes.
well, it would make a lot compositing work unnecessary
Dennis_FIQ
06-21-2009, 06:12 PM
I just wanted to bump this up to see if there where an fresh thoughts on the possibility of HDR Video.
Raptor365
06-22-2009, 09:10 AM
According to wiki the Pentax K-7 Digital SLR has an HDR capture mode. Not sure how many other cameras have it. You could try a stop motion HDR sequence with it though.
If that works and with some still cameras being able to shoot video now, albeit at a low frame rate, I'm sure it's just a matter of time.
//The Pentak is listed as being able to shoot 1280x720 stills at 30fps, whether or not that would work in HDR mode I don't know.
But if you can get the images recorded as HDR stills, I think the hard part is done.
//I see the K7 precomposites the HDR into 1 image from the 3 different exposures, so I guess the best one could get is a RAW file to work with.
Some custom software or plugins may be needed to make compositing easier but that wouldn't pose a big problem.
The pictures do look cool...
http://upload.wikimedia.org/wikipedia/commons/thumb/2/22/New_York_City_at_night_HDR.jpg/800px-New_York_City_at_night_HDR.jpg (http://upload.wikimedia.org/wikipedia/commons/2/22/New_York_City_at_night_HDR.jpg)
j1clark@ucsd.edu
06-23-2009, 03:19 PM
I just wanted to bump this up to see if there where an fresh thoughts on the possibility of HDR Video.
The thought that occurs to me is to use two cameras, one set to capture the low values of a scene (that is the highlights are blown out...), and the other to capture the high values (that is, the shadows are blank dark areas).
Render the two streams out as say png or tiff files, then use something to combine the streams into a resulting single HDR image. The problem of course is the synchronization of the frames between the two, images, so you would have to edit both to match up with some event observed by the two (a clacker or the like...).
But still there may be frame by frame jitter on the frame capture process that would cause problems. (In another application, people have used the 'pixel' digitization jitter between frames to interpolate better spatial resolution of the subject...)