LSM 510
3D FOR LSM
LSM 510 META
Functions
Carl Zeiss
03/06
B 45-0021 e
7-49
Render - Alpha: Method Description
Each
Output
pixel is a weighted sum of the
Input
voxels along a ray in view direction through the
Input
sequence. Each
Input
voxel has an opacity value, dependent only on its grey value. The opacity values are
defined by the parameters
Threshold
,
Ramp
, and
Max. Opacity
.
Accumulation of pixels proceeds along the ray from back to front, i.e. from far pixels to near pixels. If a
new pixel is added, it increases the result intensity by its grey value weighted by the opacity value, and
attenuates the previously accumulated intensity according to the opacity value. Full intensity stops
accumulation.
This calculation must be repeated for each pixel of the ray to generate one
Output
pixel. Then for each
Output
pixel to produce a 2D
Output
image for the selected view-angle. Then for each view-angle to
produce an output sequence for
Number of Views
different view angles.
Render - References
[1] J.D. Foley,A.van Dam, S. K. Feiner, J.F.Hughes, Computer Graphics: Principles and Practice, Addison
Wesley, Reading, MA, 1990.
[2] M. Levoy, Display of Surfaces from Volume Data, IEEE Computer Graphics & Applications, May 1988,
29-37.
[3] J. Ylä-Jääski, F.Klein, O. Kübler, Fast Direct Display of Volume Data for Medical Diagnosis,
VGIP:Graphical Models and Image Processing 53,1991,7-18.
[4] K.H. Höhne, R. Bernstein, Shading 3D-Images from CT Using Gray-Level Gradients, IEEE Transactions
on Medical Imaging, 5, 1986, 45-47.
[5] D.Gordon, R.A. Reynolds, Image Space Shading of 3-Dimensional Objects, CVGIP 29, 1985, 361-376.
