CHEETAH Hardware User’s Manual
Imperx, Inc.
Rev. 2.0.7
6421 Congress Ave.
7/7/2015
Boca Raton, FL 33487
+1 (561) 989-0006
119 of 152
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.
5.7.1.5 Video Amplifier
Video Amplifier allows the user to adjust the Analog and Digital Gains and
black level. Manual entry and sliders are available for adjusting the
individual parameters – Figure 5.13.
Figure 5.13 – Video Amp parameter window
Analog Gain:
The user can set the desired analog gain using
radio buttons. For digitization levels of 8 or 10-bits, analog gain
levels of 1x, 2x, 4x and 8x.can be selected. For 12-bit
digitization level, analog gain levels of 1x, 2x and 4x are
supported. Analog gain should always be applied before digital
gain.
Digital Gain:
The user can set the digital gain from 1 to
15.88x with 128 individual steps. (Step size varies with gain
setting with finer steps at lower gain settings)
Black Level:
The digital offset (0 to 8192, 1 step increment)
via the slider or by entering the desired value. Digital offset is
applied after gain.
5.7.1.6 Wide Dynamic Range (WDR)
