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8.4.4 Partial Scan
Partial scan allows a higher frame rate by reading out a smaller center portion of the image.
This is particularly useful when inspecting objects that do not fill the whole height of the
image.
Full scan
Partial scan
Vertical Timing
The diagram and table below provide vertical timing information for the fixed partial scan
settings 2/3, 1/2, 1/4, and 1/8
Values for vertical timing in partial scan continuous mode.
AREA
FVAL Low
(L)
A
(L)
B (L)
C
(L)
Total line
(L)
frame rate
(L)
Start line
End line
2/3
3
14
328
11
356
172.95
83
410
1/2
3
19
246
16
284
216.80
123
368
1/4
3
27
122
24
176
349.83
185
306
1/8
3
31
60
28
124
504.72
215
274
Fig. 19 Vertical timing for partial scanning
Fast-dump period
Fast-dump period
Normal scan period
PARTIAL
FRAME READ OUT
LVAL
FVAL
DVAL
3L
DATA
Valid data
EEN
A
B
C
1L
CCD Exposure