AM-800CL / AB-800CL
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5.4.2 Partial scan readout (AOI) (Commands: STL, ETL)
The AOI works like partial scanning. By using the AOI function, a faster frame rate can be
achieved. The start line of the image (Offset Y) and the image height (Height) can be set as
desired. However, the start pixel and/or end pixel of each line cannot be changed. In the
AM-800CL and AB-800CL RGB output, The Offset Y and Height can be set in 1 line
increments. For the AB-800CL Bayer mode, output can be set in 2-line steps.
TapB
TapA
A
B
C
D
(TAP C + TAP D)
(TAP A + TAP B)
OFFSET Y
Height
Fig.14 AOI setting
Note for AOI setting
In the AM-800CL and AB-800CL, the frame rate setting has priority. If AOI is used, the frame
rate setting should use fewer lines that that of AOI height.
For AOI setting, if the upper TAP and lower TAP have the same duration, the fastest frame
rate can be achieved. Thus, if the AOI is centered vertically within the image, the frame
rate is maximized. Examples of the settings are shown in sections 5.4.2.4 and 5.4.2.5.
5.4.2.1 Frame rate calculation if AOI is set
The calculation method for the frame rate in AOI mode depends on the setting
conditions of offset, height, Bit Allocation and binning control.
It also depends on the position of the readout such as the upper TAP, lower TAP and
covering both TAPs.
Fig.15 the position of the readout
A
B
D
C
Center part
Upper part (Upper)
Upper part (Lower)
Lower part part (Upper)
Lower part (Lower)