CCD Sensor
Scan
Object
FOV
V
0
W
P
/ ß
W
L
/ ß
Pixel #1
Pixel #1
S
V
O
:
object scan velocity
W
P
:
pixel width = pixel height
H
P
(for sensors with square pixels)
W
L
:
line spacing
S:
sensor length
FOV:
field of view
ß:
magnification =
S / FOV
B
G
R
Line Scan Camera SK6288GKOC-L Manual (06.2015) • shar
ed_CameraContr
ol(3b)_Sync_col-Ext_ML.indd (06.2015)
21
3 Camera Control and Performing a Scan
SK6288GKOC-L
Instruction Manual
(06.2015)
© 2015
Schäfter + Kirchhoff GmbH
•
Hamburg
The three lines of the implemented triple line sensor are
sensitive for the primary colors red (R), green (G) and blue
(B). For the spectral sensitivity characteristics see
27.
The pixel width W
p
is 14 µm, the line spacing W
L
is 112 µm.
which is 8 times the pixel width.
During object travel, an object point reaches the red line
sensor first. If the object is transla ted by one pixel height
per clock pulse then after 8 lines the green pixels are
exposed. After another 8
lines then the blue pixels have
been covered and all color information has been acquired.
RGB Sensors: 2D Imaging and Pixel Allocation
A
B
Monochrome font pattern
A
line synchronous object transport
B
asynchronous transport of the object
causes color convergence aberration
The Camera
SK6288GKOC-L
provides the red (R), green
(G) and blue (B) informations se quentially in one single
video output signal.
The co lor information originating from the different parts
of the object is stored in the buffer of the PC and subse-
quently reallocated correctly.
Generating the color information of object
locations for display
line scan 17
object location no.
1
2
3
...
2096
RGB RGB RGB ... RGB
PC memory of camera data
column no.
1 2 3 4 5 6 7 8 9 ...
6288
line no.
1
R G B R G B R G B ... R G B
...
9
R G B R G B R G B ... R G B
...
17
R G B R G B R G B ... R G B
...
Triple line sensors require a precise synchronous trans
-
lation of the object for the correct allocation of pixels.
Also the transport direction has to conform to the
sequence of the line acquisition: First blue (B) then
green (G) and red (R).
When these conditions are not met then images with
co lor convergence ab er rations are generated.
3 Camera Contr
ol and Performing a Scan
