BOBCAT Hardware User’s Manual
Imperx, Inc.
Rev. 2.0.2
6421 Congress Ave.
11/20/2012
Boca Raton, FL 33487
+1 (561) 989-0006
148 of 265
suppressed, if the angle is 45
O
degrees, the gray scale will not change. If
the angle is more than 45
O
degrees, the grayscale range will be enhanced.
The user can set the optimum (X1, Y1) and (X2, Y2) values, note that X2
> X1. Figure 3.5b shows some of the most typical correction curves. If the
angle in the mid range (between X1 and X2) is negative, the grayscale
range will be reversed. Curve TF 1 enhances the dark image regions and
suppresses the bright ones. TF 2 – suppresses the dark and bright image
parts and enhances the mid range. TF 3 – enhances the bright image
regions and suppresses the dark ones. TF 4 – enhances the bright and dark
image parts and suppresses the mid range.
O
u
tp
u
t
s
ig
n
a
l
Input signal
X1
X2
O
u
tp
u
t
s
ig
n
a
l
O
rigi
na
l TF
TF 1
TF 2
TF 3
TF 4
Y1
Y2
O
rigi
na
l TF
New
TF
A
B
Figure 3.5 – Multi point TF correction.
Figure 3.6 shows an original image (left) and processed one (right). The
original image has two dominant regions – predominantly dark subject
with a very bright bottom section and a relatively flat gray region. To
correct the image we will use “TF 1” type correction with points (650,
1950) and (2200,1760).
