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3. Camera mode
16
3.2.3.
Partial scan mode
This mode increases the frame rate by dividing the
whole video period vertically, reading only the
necessary lines as the actual video, and transferring
unnecessary lines at high-speed. You can set the area
between the starting and ending positions for reading to
a minimum of 240 lines.
starting position for display
≤
32
exposure time
≤
T1
T1 = ending position for d 31 + ROUNDUP ((1217 - ending position for display) / 8,0) (H)
T3 = T1 - number of lines displayed
starting position for display > 32
exposure time
≤
T1
T1 = number of lines dis 62 + ROUNDUP ((starting position for display - 32) / 8,0) + ROUNDUP ((1217 -
ending position for display) / 8,0) (H)
T3 = T1 - number of lines displayed
<ROUNDUP functions>
Round up the value for the function, ROUNDUP (x,0) = x, to the nearest whole number.
Example: ROUNDUP (50.0,0) = 50 / ROUNDUP (50.3,0) = 51
High-speed transferring period
High-speed transferring period
Whole
area
Normal transferring period
(Effective video output)
501
502
73
9
740
2
99
501
1 H
T3
T1
1600 CL
320 CL
Partial scan
FVAL
LVAL
DVAL
Video output
(lines)
240 H (number of lines displayed)
Starting position for display
Ending position for display
1H = 53.333 µs
1 CL = 27.777 ns
Example: PARTIAL 1 500 739