[FoRK] It's Time to Start 3D Scanning the World

Albert Boulanger aboulanger at ldeo.columbia.edu
Thu Jan 12 06:56:22 PST 2012


There is also this variant
http://en.wikipedia.org/wiki/Light-field_camera
https://www.lytro.com/camera

Albert Boulanger

On 1/11/2012 1:00 PM, Ken Meltsner wrote:
> On Wed, Jan 11, 2012 at 9:22 AM, Stephen Williams <sdw at lig.net> wrote:
>
>> No special hardware is needed to get very good 3D scans, once we get a
>> little more CPU and improve the algorithms just slightly.  Stereo vision,
>> using just a single camera moved around a bit, is plenty to get pretty good
>> data.
>>
> You can even do it with a single camera in one shot and without special
> light sources.  Mike Bove at the MIT Media Lab did his dissertation on
> extracting 3-D information using depth of field -- basically, you have a
> special lens that splits the viewed scene into two pictures with different
> depths of field.  After lots of computation, you can determine how far away
> any part of the scene is.
>
> Twenty-five years ago, this was a serious computational task, but it might
> be feasible today with much, much less hardware.  The technique did work
> best when the object in question had a visible pattern or texture so that
> the program could determine how well focused each image section was.
>
> Ken Meltsner
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