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Camera mode
12
Partial scan mode
In this mode, the desired area is read out as the effective
image portion from the effective image area that is
vertically divided into approximately 16 areas, and the
redundant image area is transmitted at high speed to
increase the frame rate. Set the block numbers for high-
speed transmission (Read beginning block point PSAH)
and for normal transmission (Read block number
PSAF).
Number of effective image lines
Effective image lines: 128 × (PSAF + 1) lines
PSAF: 0 to 15
When the bottom area of the window is included in the
selected area, the effective image lines decrease for the
lines of the invalid image area. The number of lines of
the invalid image is not steady. It differs according to the
value of PSAH or PSAF.
Starting/Ending point of effective image
The PSAH value of just before the effective image
starting point determines which line of the CCD
effective pixel will be the effective image starting point.
It involves fine adjustment of the timing inside the high-
speed transmission length and the lines for 1 block are
not simply 128. It differs according to the PSAH value.
Also, after you have set an effective image ending point
of an area selection, if you specify this point as a starting
point of another setting, the two points may differ. This
is due to the operation principle stated above and is not
a malfunction.
Block numbers of high-speed transmission
(Read beginning block point PSAH)
Block numbers of normal transmission
(Read block number PSAF)
Whole area
1H
B
A
1
2
3
4
5
A
Vertical timing
FVAL
LVAL
DVAL
Image output
(The horizontal timing is the same as in the normal mode.)
Normal transmission length
High-speed transmission
length
High-speed transmission
length
In the Normal transmission block
1 block = 128 lines