Dimensional
Imaging is a world-leading supplier of human body surface image capture
and analysis solutions. Their innovative
passive stereo
photogrammetry technology delivers ultra-high resolution 3D surface images
from one or more stereo pairs of digital stills images. They have recently
launched a groundbreaking “4D” surface image capture system,
which is capable of capturing 3D video sequences of dynamically changing
surfaces. We think that the Dimensional Imaging approach is a particularly
attractive solution for acquiring high-resolution images of faces and
facial expressions for use in perceptual research, from generating visual
experimental stimuli to analysing facial features and movements.
Capture
Dimensional Imaging has pioneered the 3D surface image capture method
of Passive Stereo Photogrammetry.
This allows high density 3D models to be recovered simply from a stereo
pair of standard digital still camera images. It does not require any
pattern projection or laser scanning onto the scene.
As a result the capture process is extremely fast and simple: one
or more stereo pairs of images of a subject or scene are captured simultaneously
and instantaneously using an array of pre-calibrated digital stills
cameras.
Processing
The core of Dimensional Imaging’s approach to 3D and 4D surface
image capture is its world leading DI3D™ stereo photogrammetry
software.
DI3D™ processes automatically a stereo pair of images (with
associated camera calibration data) to create a dense and accurate
range map.
A range map is a highly efficient image-like structure for storing
dense 3D data, in which every pixel in the range map image represents
the 3D position of that pixel in space.
DI3D™ is therefore capable of calculating the 3D position for
every pixel in the input image: up to 10 million points or more depending
on the resolution of the cameras used.
Polygonisation
In order to be displayed using current 3D graphics engines and opened
using most third party 3D software, DI3D™ allows the range map
to be converted into a polygon mesh in most standard 3D mesh file formats.
The user can control the density of mesh in order to optimize it for
speed of display and manipulation (low density) or high resolution
(high density).
In addition one of the original high resolution images can be texture
mapped onto the polygon mesh, to provide a full color, high resolution
3D mesh model.
Merging
It is often not possible to capture all of the required surface from
a single point of view. DI3D™ offers a simple solution: use multiple
stereo pairs of cameras to capture simultaneously 3D surface patches
from multiple view-points.
DI3D™ then allows multiple surface patches to be merged automatically
together to form a single seamless 3D mesh.
Larger number of surface patches can be merged together semi-automatically
using third party manual mesh merging software.
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News (July - December 08)
