Re: [Gimp-user] Light Field Camera
On 11/13/2011 02:42 AM, Mikael Ståldal wrote: On 2011-10-29 17:01, Johan Vromans wrote: > Any ideas how this will impact foto-editing? From GIMP's perspective, I think this can be seen as a new, more advanced, form av RAW images. Current RAW images allows you to adjust certain aspectes after the exposure, such as white balance. This Light Field Camera adds another aspect to the list of adjustable aspectes: focus. Currently GIMP has no direct support for any RAW images, you have to pre-process them with a plugin which generates a regular bitmap which is then fed into GIMP. Images from a Ligth Field Camera could be handled in the same way. Yes, but the plug-in would have to discern and extract the bitmap from the proprietary stored format in a manner similar to what the software that presents the refocused image to the viewing screen does - as noted in earlier posts (or so it seems to me). One possible advanced plugin feature might be to refocus in successively finer checkerboards, each checkerboard choosing as its "focus locus" the quadrant containing the crispest edges. Kind of a 3-D Warnock's algorithm. Seems it could result in a "focused everywhere" image, if the imaged object is smooth enough. -- Burnie ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] Light Field Camera
On 2011-10-29 17:01, Johan Vromans wrote: > Any ideas how this will impact foto-editing? From GIMP's perspective, I think this can be seen as a new, more advanced, form av RAW images. Current RAW images allows you to adjust certain aspectes after the exposure, such as white balance. This Light Field Camera adds another aspect to the list of adjustable aspectes: focus. Currently GIMP has no direct support for any RAW images, you have to pre-process them with a plugin which generates a regular bitmap which is then fed into GIMP. Images from a Ligth Field Camera could be handled in the same way. ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] Light Field Camera
On 10/29/2011 04:15 PM, Burnie West wrote:
On 10/29/2011 10:54 AM, Frank Gore wrote:
On Sat, Oct 29, 2011 at 1:47 PM, Johan Vromans wrote:
But what would be required to process the 'raw' (multi-dimensional) data
from an LFE camera? Each pixel or group of pixels gets a Z-component
that makes the object that this group represents in focus in a
particular plane only.
It currently requires custom proprietary software from the
manufacturer, no other software can decode those images yet. As for
the mechanics of how it could be done and how to add support for it,
that would be best discussed on the dev mailing list. However, since
there are currently no publicly available output files from those
cameras, the point is moot.
--
Frank Gore
www.ProjectPontiac.com
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It appears (from the underlying thesis) that an array of individual images
with different
focuses are captured. The thesis itself indicates 30 images located in a
square array,
with the target image captured in each element. Since the images are
distributed across
the entire photosensitive array, a fair amount of chromatic dispersion can be
detected.
For any image, therefore, 30 times as many pixels (more or less, depending on
the
subsequent manufacturing details) must be captured. The underlying software
has an
apparently complex but straightforward sorting problem, allowing to choose
whichever
pixel is at the best focus for the selected image point in the composite.
It appears at first glance that the images in the light field camera picture
gallery have
at least four focal planes available
(https://www.lytro.com/living-pictures/282).
From the image editing standpoint (if this is the case), it would not be
sharply different
from the refocusing opportunity by providing four successive shots with
different focal
length. Of course, the chromatic aberration correction would not be available
this way,
nor would moving image capture be handled.
So the thirty images would necessarily have to be divided into the appropriate
planes,
presumably using radial symmetry for the chromatic correction.
Seems to me the light field camera is a pretty good idea, and as it evolves
over time I
suspect it will be quite interesting.
The thesis itself is available from the lytro.com website -
lytro.com/renng-thesis.pdf
-- Burnie
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An article in the December Atlantic magazine ("Deep Focus" by Rob Walker)
suggests that the released Lytro cameras are more complex than the
aforementioned thesis describes. According to Rob, Ren Ng's Lytro camera has
"integrated hundreds of microlenses into a single device." Certainly
interesting; hardly a simple direction for GIMP to pursue.
-- Burnie
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Re: [Gimp-user] Light Field Camera
On 10/29/2011 10:54 AM, Frank Gore wrote: On Sat, Oct 29, 2011 at 1:47 PM, Johan Vromans wrote: But what would be required to process the 'raw' (multi-dimensional) data from an LFE camera? Each pixel or group of pixels gets a Z-component that makes the object that this group represents in focus in a particular plane only. It currently requires custom proprietary software from the manufacturer, no other software can decode those images yet. As for the mechanics of how it could be done and how to add support for it, that would be best discussed on the dev mailing list. However, since there are currently no publicly available output files from those cameras, the point is moot. -- Frank Gore www.ProjectPontiac.com ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list It appears (from the underlying thesis) that an array of individual images with different focuses are captured. The thesis itself indicates 30 images located in a square array, with the target image captured in each element. Since the images are distributed across the entire photosensitive array, a fair amount of chromatic dispersion can be detected. For any image, therefore, 30 times as many pixels (more or less, depending on the subsequent manufacturing details) must be captured. The underlying software has an apparently complex but straightforward sorting problem, allowing to choose whichever pixel is at the best focus for the selected image point in the composite. It appears at first glance that the images in the light field camera picture gallery have at least four focal planes available (https://www.lytro.com/living-pictures/282). From the image editing standpoint (if this is the case), it would not be sharply different from the refocusing opportunity by providing four successive shots with different focal length. Of course, the chromatic aberration correction would not be available this way, nor would moving image capture be handled. So the thirty images would necessarily have to be divided into the appropriate planes, presumably using radial symmetry for the chromatic correction. Seems to me the light field camera is a pretty good idea, and as it evolves over time I suspect it will be quite interesting. The thesis itself is available from the lytro.com website - lytro.com/renng-thesis.pdf -- Burnie ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
[Gimp-user] Light Field Camera
On Sat, Oct 29, 2011 at 1:47 PM, Johan Vromans wrote: > > But what would be required to process the 'raw' (multi-dimensional) data > from an LFE camera? Each pixel or group of pixels gets a Z-component > that makes the object that this group represents in focus in a > particular plane only. It currently requires custom proprietary software from the manufacturer, no other software can decode those images yet. As for the mechanics of how it could be done and how to add support for it, that would be best discussed on the dev mailing list. However, since there are currently no publicly available output files from those cameras, the point is moot. -- Frank Gore www.ProjectPontiac.com ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] Light Field Camera
Noel Stoutenburg writes: > ... the camera capturing > "all the light from the scene", when in fact, the camera is only > capturing the light from the scene that enters the camera, just like a > more conventional digital camera. In the end there will still be an > image that can be manipulated, If I have understood it correctly, the camera does not merely capture the pixels (colour value) but alse the direction where the light came from. This would add a dimension (in the fysical sense) to the information. Think of it as photo-editing becoming 3-dimensional. -- Johan ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
[Gimp-user] Light Field Camera
Any ideas how this will impact foto-editing? www.lytro.com -- Johan ___ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
