LSM 710 and LSM 780
LEFT TOOL AREA AND HARDWARE CONTROL TOOLS
Systems
Acquisition Tab
Carl Zeiss
02/2010 M60-1-0025
e
69
•
Select
8 Bit
,
12 Bit
or
16 Bit
Data Depth, i.e. 256, 4096 or 65536 gray values.
•
Select the
Unidirectional
or
Bi-directional
Scan Direction.
−
Unidirectional: The laser scans in one direction only, then moves back with beam
blanked and scans the next line.
−
Bi-directional: The laser also scans when moving backwards, i.e. the Scan Time is
halved. The online scanner calibration (OSC) will correct for nonlinear distortions of the lines in
bidirectional mode. This function (see also checkbox in
Maintain Tab
->
LSM Options
->
Hardware
) eliminates most of the deviations of the scanmirrors at the very fast speeds.
−
The pixel shift between forward and backward movement (double
image) resulting from bi-directional scanning must be corrected. For automatic scan correction,
click on the
Auto
button. If
Auto
is off the scan
Corr X
and
Y
sliders which are indicated when
selecting bidirectional scanning. Zero° rotation requires correction in the X-direction, 90° rotation
must be corrected in the Y-direction. If the image was rotated, correction is required in both
coordinates. Correction is performed on-line in the
Continuous
scan mode. The size of the shift
depends on the Scan Speed.
•
Select the
Line
or
Frame
mode for averaging.
•
Select the desired scan average method
Mean
or
Sum
.
•
Select the desired scan average from the available values
2
,
4
,
8
and
16
in the
Number
selection drop
down menu or
Continues
(only for
Frame
average mode).
The greater the number of averages selected for
Mean
average
Method
, the better the image
quality will be; the scanning time will be prolonged accordingly.
Averaging can be performed in different ways, depending on whether the
Mean
or
Sum
method has
been activated.
If you are using the
Mean
method, the image information is generated by adding up all scans pixel by
pixel and then calculating the mean value.
In the
Sum
method, the intensity values of all images are added up, without a mean value being
calculated.
To create the image information using the
Line
average mode, each line (depending on the setting) is
scanned 2, 4, 8 or 16 times during Scan Average, and then the average value per pixel is calculated. This
minimizes noise interference during the scanning procedure.
If the
Frame
average mode is used to create the image information, the complete frame is scanned 2, 4,
8 or 16 times, depending on the setting. The average value is recalculated after each frame scan.
The
Frame
average mode also permits continuous averaging.
For this, select the
Continuous
option in the
Number
selection box.