Slashdot Mirror
World's First Full HDR Video System Unveiled
Zothecula writes "Anyone who regularly uses a video camera will know that the devices do not see the world the way we do. The human visual system can perceive a scene that contains both bright highlights and dark shadows, yet is able to process that information in such a way that it can simultaneously expose for both lighting extremes – up to a point, at least. Video cameras, however, have just one f-stop to work with at any one time, and so must make compromises. Now, however, researchers from the UK's University of Warwick claim to have the solution to such problems, in the form of the world's first full High Dynamic Range (HDR) video system."
Roger Ebert asked the same thing (on page 4)
http://www.newsweek.com/2010/04/30/why-i-hate-3-d-and-you-should-too.html
I think there's a couple reasons. The first, and probably most significant, is nostalgia by film makers. They love the motion blur of 24fps. It helps evoke the "feeling" of film. Every film student I know either wants to shoot or convert their footage to 24fps. There is a noticeable difference. When you start increasing the resolution and frame rate, you lose motion blur and it starts to look like home video or video games (when generally don't compute motion blur at all).
Another big issue is the amount of light. When you have more frames in a second, each frame has less light to suck up. It's a big issue with high-speed film. Having sensors that are more light-sensitive is a fairly recent thing (combined with advanced noise reduction) and will continuously get better.
The stuttering is something cinematographers keep in mind when shooting (or at least, they should). I read an article about shooting imax and they said the biggest problem was the stuttering. They're also using 24fps, but the screens are much larger. When you pan, the object could jump 2 to 3 feet per frame. They intentionally had slower pans to compensate. You noticing this is probably a side-effect of larger theatrical screen and larger tvs at home.
I find it kind of funny that HDR means the opposite thing in photography versus video games
http://img194.imageshack.us/img194/7391/1244894383293.jpg (pulled from some old digg post)
Traditionally games render the world and keep it between 0 and 1 (zero being black/completely dark and 1 being white). HDR is computing values above and below and clipping so things that are blown out (like reflections and highlights) are super white. I think it was an update to Half Life 2 that first did this in a commercial game.
In photography, they take multiple exposures and stick them in to an HDR image. Then, they use tone mapping to convert it to an 8-bit visible image. Tone-mapped images are generally called HDR, even though that's a misnomer.