focus after the shot

Comments

3 responses to “focus after the shot”

1. 

   July 26, 2011

   Rob Geraghty

   Hi Peter,

   You need to have a look at the website.  The image sensor used is not a normal CCD like in most cameras, because instead of just recording intensities of colours it also records the angle of the light.  Knowing the angle of the light, it would be possible to refocus the image independently of the lens.  It’s very different from how a conventional camera works.  I thought perhaps they were using techniques based on fourier transforms (and they may be) but the fact that they are recording the angle of the light means that they are able to process the data very differently from a normal CCD.  Using two dimensional fourier transforms it’s possible to remove the aberrations from a photo to produce an image which is better than the camera saw.  If you added the data about the light angles, even more complex transformations would be possible – as this technology appears to demonstrate.  I can see that it’s possible, but it doesn’t look like the technology is marketable yet.  The processing required to produce images in this way would be significant.  Also forget simple JPG files for storage – each set of raw image data would be large to capture all the vectors for each pixel, and would have to be a purpose designed format.  Of course you could choose the focus you want then make a simple jpg of that…

   Rob

     ======= Rob Geraghty the_harper@yahoo.com

   ________________________________ Cc: “‘birding-aus@vicnet.net.au’” Sent: Tuesday, July 26, 2011 5:31 PM

   I first heard of these cameras a few months ago. They’re a bit vague about how they work, but I got the impression that they use a small aperture to get everything in focus, but also somehow encode the distance from the camera to each pixel. That allows them to later blur parts of the picture outside the chosen focus distance, giving the impression of variable focus.

   If that’s the case then only slow shutter speeds will be available, not much use for bird photos. I may have misunderstood though.

   Peter Shute ===============================

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2. 

   July 26, 2011

   peter

   I first heard of these cameras a few months ago. They’re a bit vague about how they work, but I got the impression that they use a small aperture to get everything in focus, but also somehow encode the distance from the camera to each pixel. That allows them to later blur parts of the picture outside the chosen focus distance, giving the impression of variable focus.

   If that’s the case then only slow shutter speeds will be available, not much use for bird photos. I may have misunderstood though.

   Peter Shute
3. 

   July 26, 2011

   Carl Clifford

   Ian,

   Incredible stuff, digital camera technology has certainly changed since I bought a Sony Mavica in 1997. Here is a link that shows (blurry) images that are purportedly of Lytra’s camera. Adabe is also working on the same idea. Time will tell which one becomes the Betamax.

   Cheers,

   Carl Clifford

   g’Day Geoff

   This is the new focus software system that Canon is chasing so said an ABC show recently. High resolution may be an issue according to some commentary but if it works, pelagics will never be the same.

   http://www.lytro.com/pictures/lyt-8/

   Regards

   Ian ===============================

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