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<jvromans squirrel nl>  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
gimp-user-list mailing list
gimp-user-list gnome org

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 (

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 website -

  -- Burnie
gimp-user-list mailing list
gimp-user-list gnome org
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

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]