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On Wed, 11 May 2005 02:02:08 +0200, Warp <war### [at] tag povrayorg> wrote:
> Thorsten Froehlich <tho### [at] trfde> wrote:
>> It is a regular MPEG-4 file,not even MPEG-4 Part 4 (aka H.264).
>
> I thought H.264 was part 10.
>
>> Probably
>> anything that can play a modern Divx file can play it.
>
> How? I have tried everything.
VLC plays it just fine for me. No other player seems to manage it.
--
FE
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Warp wrote:
> Thorsten Froehlich <tho### [at] trfde> wrote:
>
>>It is a regular MPEG-4 file,not even MPEG-4 Part 4 (aka H.264).
>
> I thought H.264 was part 10.
Of course, part 4 is the regular encoding. I should read again before I post...
Thorsten
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Jellby wrote:
> Many of you have probably seen this at slashdot,
>
> Here is a physical technique to interchange the roles of a camera and a
> light-source which is reminds me of how POV-Ray calculates the rays.
>
> See the (maybe slashdotted) page:
> http://graphics.stanford.edu/papers/dual_photography/
>
> download the 60MB movie and marvel at the card-trick at the end.
The movie is available at http://www.povray.org/temp/DualPhotography.mp4
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Jim Henderson wrote:
> what they're suggesting is that through their techniques, you could
> reconstruct a hidden surface using the reflections off of a non-reflective
> surface, but I'm not totally convinced that that's possible given the
> dispersal of light.
that's what they do in the card trick, though I understand that the general
technique relates to reconstructing the view of a subject lit from the place
that the camera used to be, and viewed from where the light was, with no
other light. In that case (in theory), the hidden parts of the object (the
ones not visible in the original image I mean), while technically visible
from the new camera location, would however be in shadow and thus not
revealing any detail not originally visible from the camera's point of view.
-- Chris
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Warp wrote:
> Now, I have to admit I'm at a loss about how to play that .mp4 file.
> Winamp opens it ok, but plays the audio only, no video. Windows media
> player (version 9 in Windows XP) refuses to play it altogether ("Windows
> Media Player cannot play the file."). The Core Media Player does not
> recognize the format at all. The Video Inspector utility (which can be
> used to determine if codecs needed by multimedia files are installed in
> the system or not) does not recognize the format either.
quicktime worked for me.
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Yeah, that was pretty much my read as well. I pulled the paper down to
read it over, just haven't had the time yet.
Jim
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Personally, I played it using mplayer (which is a Linux tool) - the codec
it picked was was the FFmpeg library used there, if that's possibly of
help. I don't have any "real" Windows systems any more.
Jim
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On Tue, 10 May 2005 22:18:13 +0100, scott wrote:
> I don't see why it isn't possible. The projector is lighting one tiny
> segment of the card at a time, if it hits a red bit, the book is going to
> be lit with a red hue, very easy to pick up by the camera. Once it's
> scanned the whole card, it would be easy to build up the picture.
That's the trick, though - the projector shown in the video, unless I'm
terribly mistaken, is just a standard video projector (the type you might
plug a PC into to project it on the screen) - so the projector is in fact
lighting the entire book/card scene all at the same time.
Jim
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Among other things, Warp saw fit to write:
> Now, I have to admit I'm at a loss about how to play that .mp4 file.
> Winamp opens it ok, but plays the audio only, no video. Windows media
> player (version 9 in Windows XP) refuses to play it altogether ("Windows
> Media Player cannot play the file."). The Core Media Player does not
> recognize the format at all. The Video Inspector utility (which can be
> used to determine if codecs needed by multimedia files are installed in
> the system or not) does not recognize the format either.
mplayer in an up-to-date linux box gave no problem (other than asking to use
-nocache, and that did help). I guess it's a matter of codecs and you'd
have to find the appropriate one for your system, but I can't help in
that...)
--
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby
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Among other things, Jim Henderson saw fit to write:
>> I don't see why it isn't possible. The projector is lighting one tiny
>> segment of the card at a time, if it hits a red bit, the book is going to
>> be lit with a red hue, very easy to pick up by the camera. Once it's
>> scanned the whole card, it would be easy to build up the picture.
>
> That's the trick, though - the projector shown in the video, unless I'm
> terribly mistaken, is just a standard video projector (the type you might
> plug a PC into to project it on the screen) - so the projector is in fact
> lighting the entire book/card scene all at the same time.
As I understand it, the scene is lit "pixel by pixel", and the resolution
use for lighting is the resolution you get in the "dual image". If all the
scene is illuminated at once, it makes no sense talking about the projector
resolution. Besides, in the paper there is a figure for the card trick that
shows the different images seen by the camera when the light is sent to
different "pixels" of the card.
Anyway, I believe those projectors, like TVs and monitors, actually perform
a sweep over the screen, and we see it as a whole image due to... guess
what, persistence of vision ;-) (and maybe to screen persistence on TVs and
monitors). What would probably be needed is to slow down the scanning in
the projector or to use a very high speed camera.
--
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby
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