Comparison of VASARI and MARC imaging Comparison of VASARI and MARC imagingThe principle difference between the VASARI and MARC camera systems is that the 6 band VASARI scanner moves the camera and fiber optic lights while the RGB MARC camera moves the CCD in the image plane and uses conventional fixed photographic lights.
The following table is a comparison of the VASRI and MARC imaging systems.
Comparison of VASARI and MARC imaging
|
VASARI |
MARC |
|
not portable |
fairly portable |
|
object size limited by mechanics |
size limited by illumination and position |
|
pels/mm resolution known |
not known automatically |
|
localized lighting effects |
lighting looks same as photograph |
|
illumination pattern corrected |
difficult to correct |
|
objects must be fairly planar |
3D objects possible |
|
preview and acquisition slow |
preview and acquisition much faster |
|
color accuracy higher |
RGB system slightly less accurate |
Source: [1]
The calibration time is relatively long in both systems and is usually done after image acquisition is completed. A scan with the MARC camera of 6k*10k takes about 14 minutes for acquisition and about 45 minutes for calibration. Both processes are not yet fully optimized and significant speedup is possible through the use of multiprocessors and a faster disk system.