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CAMERAS FRAME GRABBERS IMAGING SOLUTIONS
BOBCAT Hardware User’s Manual
IMPERX
Rev. 2.0.7
6421 Congress Ave.
4/8/2014
Boca Raton, FL 33487
www.imperx.com
+1 (561) 989-0006
201 of 329
dual (known also as interval or window) thresholding technique has to be
implemented – Formula 3.2. The binary image output is converted to “white” for
all gray level values between the selected threshold interval X1 and X2, and to
“black” for all gray levels outside (X1, X2) interval. The user can set the optimum
X1 (Low) and X2 (High) threshold values, please note that X2 > X1. Figure 3.2
shows the original a processed image after a dual threshold operation.
Output signal =>
“BLACK” if (input signal
≤
X1)
“WHITE” if (X1 < input signal < X2)
“BLACK” if (input signal
≥
X2)
(3.2)
Figure 3.1 – Original and processed image with single threshold.
Figure 3.2 – Original and processed image with double threshold.
3.2.1.3 Dual Threshold with Gray Scale
In some low contrast imaging applications, the simple threshold operation along
with a superimposed gray scale image might yield a good result. In such cases a
dual thresholding technique with a gray scale has to be implemented – Formula