40.816 m, ∆B = 40.6653 m, ∆f = 3.0769 m.
The results obtained by quantifying the error
images are: N
ref
= 2294208 pixels, N
abs
= 783 pixels,
N
relat
= 3.4129 * 10
-4
, N
relat%
= 0.0341 % and
Q=0.9997 and the quality of the 3D rendering is
visually assessed as
satisfactory.
5 CONCLUSIONS
In this paper, after validating experimentally the
global shooting/viewing geometrical process for
auto-stereoscopic visualization, a visual observation
method has been proposed to assess the rendering
quality depending on the positioning accuracy of the
image sensors. Hence, a suitable accuracy is fixed
when 3D rendering is assessed to be satisfactory.
This is done with quantifying the error images to
compare the positioning error impacts of the
different structural shooting parameters.
In this method, the error images express the
inconsistency of the different viewpoint images.
Hence, with their quantification, a relation between
the images inconsistency and the visual assessment
can be achieved.
The quantification of error images and its
relation regarding to the visual assessment of the
rendering quality can constitute a basis for learning
after a sufficient number of tests. This basis will
exempt us from the visual assessment of the 3D
image quality and it will be sufficient to only use the
quantification of the error image including the
relative error.
The second proposed method provides an
objective relation between the visual acuity
expressing the quality and the positioning accuracy
of shooting parameters. This relation can be used to
specify any implying parameter (e, d, pitch of the
sensor pixels or pitch of the screen pixels) by taking
into account the other ones.
ACKNOWLEDGEMENTS
The authors thank the ANR within Cam-Relief
project and the Champagne-Ardenne region within
CPER CREATIS for their financial support.
REFERENCES
Ali-Bey M., Manamanni N., Moughamir S., 2010,
‘Dynamic Adaptation of Multi View Camera
Structure’,
3DTV-Conference: The True Vision -
Capture, Transmission and Display of 3D Video
(3DTV-CON’10),
Tampere, Finland.
Ali-Bey M, Moughamir S, Manamanni N, 2010, ‘Towards
Structurally Adaptive Multi-View Shooting System’,
18th Mediterranean Conference on Control and
Automation (MED)
, Marrakesh, Morocco.
Benoit A., Le Callet P., Campisi P., Cousseau R., 2008,
‘Quality Assessment of Stereoscopic Images’,
Hindawi, EURASIP Journal on Image and Video
Processing
. doi:10.1155/2008/659024.
Blach R., Bues M., Hochstrate J., Springer J., Fröhlich B.,
2005, ‘Experiences with multi-viewer stereo displays
based on lc-shutters and polarization’,
In Proceedings
of IEEE VR Workshop: Emerging Display
Technologies.
Dodgson N. A., 2002, ‘Analysis of the viewing zone of
multi-view autostereoscopic displays’, In Stereoscopic
Displays and Virtual Reality Systems IX
, vol. 4660 of
Proceedings of SPIE, pp. 254–265.
Dubois E., 2001, ‘A projection method to generate
anaglyph stereo images’
In Proc. IEEE Int. Conf.
Acoustics, Speech, and Signal Processing (ICASSP
'01)
, vol. 3, pp. 1661–1664, IEEE Computer Society
Press.
Graham J., Delman L., Nicolas H., David E., 2001,
‘Controlling perceived depth in stereoscopic images’,
In Proc. SPIE Stereoscopic Displays and Virtual
Reality Systems VIII
, 4297:42-53, June.
Güdükbay U., Yilmaz T., 2002, ‘Stereoscopic view-
dependent visualization of terrain height fields’, IEEE
Trans. on Visualization and Computer Graphics
, vol.
8, no. 4, pp. 330–345.
Kilner J., Starck J., Guillemaut J. Y., Hilton A., 2009,
‘Objective quality assessment in free-viewpoint video
production’, Signal Processing: Image
Communication
, vol. 24, no. 1-2, pp. 3-16.
Meesters L. M. J., Wijnand A. IJsselsteijn, Pieter J. H.
Seuntiëns, 2004, ‘A Survey of Perceptual Evaluations
and Requirements of Three-Dimensional TV’,
IEEE
Trans. on Circuits and Systems for Video Technology
,
vol. 14, no. 3, pp. 381 – 391.
Müller K., Smolic A., Dix K., Merkle P., Kauff P.,
Wiegand T., 2008, ‘View synthesis for advanced 3D
video systems’,
Hindawi Publishing Corporation,
EURASIP Journal on Image and Video Processing.
Perlin K., Paxia S., Kollin J. S., 2000, ‘An
autostereoscopic display’,
In Proceedings of the 27th
ACM Annual Conference on Computer Graphics
(SIGGRAPH '00)
, vol. 33, pp. 319–326.
Prévoteau J., Chalençon-Piotin S., Debons D., Lucas L.,
Remion Y., 2010, ‘Multi-view shooting geometry for
multiscopic rendering with controlled distortion’,
Hindawi, Int. Journal of Digital Multimedia
Broadcasting (IJDMB), Advances in 3DTV: Theory
and Practice
.
Sanders W., McAllister D. F., 2003, ‘Producing anaglyphs
from synthetic images’, In Stereoscopic Displays and
Virtual Reality Systems X
, vol. 5006 of Proceedings of
SPIE, pp. 348–358.
IMAGAPP 2011 - International Conference on Imaging Theory and Applications
46