Piranha Color Camera User’s Manual
36
DALSA
03-032-10211-01
5/9/2007
The Piranha Color is a bidirectional camera and the direction of the web movement can
be arranged in either way. If the object is passing the camera in the other direction, its
image will pass over the Blue channel first, then the Green channel, and finally the Red
channel. In order to properly construct a full color (RGB) image, the system needs to
know the direction of the movement. Another parameter, color scan direction (scd), is
used to specify the direction of web movement.
Setting the Line Delay between Colors
Purpose:
Sets the number of lines of delay between colors that are read out
from the sensor.
Syntax:
ssa i
Syntax Elements:
i
Line delay between colors in a range from 0-6.
Notes:
To read the current line delay, use the command
If your line rate matches the speed of the object, then the value of
the line delay will be 3.
Adjust the
ssa
value until you remove the red and blue halos
above and below a black on white horizontal line in order to set
the line delay.
Example:
ssa 3
3.12 Averaging Horizontal Pixels
Setting the Averaging Horizontal
Purpose:
Averaging reduces the pixel noise and decreases the horizontal
resolution. The charge collected in adjacent pixels is averaged
together.
Syntax:
sah i
Syntax Elements:
i
The number of horizontal pixels to average. Available values
are 1 (factory setting) and 2.
Notes:
•
Selecting
sah 1
results in no averaging.
•
Selecting
sah 2
averages pairs of pixels: 1+2, 3+4, 5+6…
•
If you are using averaging, the minimum, maximum, and
mean statistics generated by the
gl
or
gla
commands and
used by the
ccg
,
cao
,
ccf
, and
ccp
commands are for the
un-averaged pixels.
•
Changing the averaging does not require the recalibration
(analog gain, FPN or PRNU) of the camera.
•
The current value of horizontal averaging factor can be
obtained using the
gcp
or
get sah
commands.
•
Horizontal averaging does not affect the CCD readout time,
but it does affect FIFO readout as all the pixels still need to
be read out of the CCD, but only the averaged pixels stored
in the FIFO (line store).
•
ROI will be pushed out to include both averaged pixels at
each end (e.g. if the ROI was 4-2048, the start value would
be changed to 3, since the first averaged pixel consists of
sensor pixels 3 and 4).
Summary of Contents for PC-30-02K60
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Page 32: ...Piranha Color Camera User s Manual 32 DALSA 03 032 10211 01 5 9 2007 Exposure Modes in Detail ...
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