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Piranha4 4K Camera Color User's Manual
03-032-20180-01
Teledyne DALSA
Spatial Correction and Trilinear Sensor Design
The P4-CC-04K07T-00-R cam era u ses a trilinear sensor w here three sep arate 4K lines of p ixels are u sed —
one for red , the center for blu e and the last for green.
Figure 3: Trilinear Sensor Line Spacing Diagram
The three lines of p ixels are sep arated by single line sp acing each and this line sp acing is equ al to 2x the
sensor p ixel size. When the im age p asses the three lines of p ixels, the red , blu e and green com p onents for
the sam e im age location are cap tu red at a d ifferent tim e as d ictated by the line sp acing. The cam era
au tom atically corrects for the line sp acing to ensu re that the red , blu e and green com p onents of the im age
p ixel are all aligned w hen ou tp u t. H ow ever, this is only correct w hen the object p ixel size is squ are ; i.e.,
the d istance m oved by the object for one EXSYN C p eriod is equ al to the w id th of the object p ixel. In som e
ap p lications it m ay not be p ossible to achieve a ‗squ are‘ object p ixel as fine ad ju stm ent of the lens
m agnification and / or the d istance m oved for each EXSYN C p eriod is not p ossible. This scenario m ay be
esp ecially ap p arent w hen trying to integrate the cam era into an existing system .
When it is not p ossible to generate a squ are object p ixel, color artefacts w ill occu r in the scan d irection
and is p articu larly noticeable at sharp ed ge transitions. The size of the ed ge artefact is p rop ortional to
how far the p ixel is from squ are. To correct for this, the cam era has a featu re, Line Sp atial Correction (or
three letter com m and ssa), w hich allow s fine ad ju stm ent of the com p ensation m echanism the cam era u ses
to correct for the line sp acing.
The d efau lt setting for this featu re is 3, w hich is set for squ are object p ixels. The setting can be ad ju sted
from 0 to 5 to com p ensate for rectangu lar p ixels
—
w hether they are too long or to short.
The follow ing exam p les of im age artefacts show black to w hite im age transitions and the associated
corrected im age after ap p lying a sp ecific ssa setting.
10.56um
10.56um
10.56um
21.12um
21.12um
Red
Blue
Green
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