Cheetah KAC Camera User Manual | Camera Link (CLF) Interface
October 1, 2019
Page
76
of
135
Rev 7.2
Figure 39: AOI Functions.
Full Frame:
This is a pre-programmed AOI providing the full resolution of the camera.
QFHD:
This is a pre-programmed AOI providing a Quad Full HD (3840 x 2160) centered within the
field of view
available only on the C4030 version
Custom:
The user can enter the desired area of interest by setting the active window size (Width,
Height) and offset (X, Y). Image location (1, 1) is top left corner. The user can set the
desired window size by inputting the numbers directly or use the scroll controls.
Horizontal offset value should be multiple of 8, horizontal offset value should be multiple
of 2.
4.7.1.7 Subsampling and Averaging
Subsampling and Averaging functions are active within the defined AOI and is used to
reduce the output resolution while maintaining the desired field of view.
Figure 40: Subsampling Functions.
Off
: Both subsampling and averaging are disabled.
Subsampling
: Decimates the output image within the defined AOI by outputting ‘N’
out of ‘M’ pixels within each row and ‘N’ out of ‘M’ rows within each frame. The ‘N’
pixels and rows are adjacent to one another. In all cases, ‘N’ must be less then ‘M’. If
‘N’ is greater than or equal to ‘M’, subsampling is disabled.
Note: For color applications (Bayer Output), N and M values must be multiples of 2.
Averaging
: The Cheetah offers a four-into-one (4:1) and nine-into-one (9:1)
averaging. In the case of 4:1 averaging, four pixels are summed together and the
result divided by 4. In the case of 9:1 averaging 9 pixels are summed and the result
divided by nine. Averaging can be used with monochrome or color image sensors. In
the case of color, the Bayer pattern will be preserved.
