
Software / Parameter Settings
English, Revision 06, Date: 12.07.2011
30
In this menu, the minimal symbol contrast Scmin can be set. This value is the threshold
for detecting a barcode.
4.8
Luminance Histogram
In order to determine the suitability of the guidance track for secure detection, there‘s
a Luminance histogram available:
Figure 17
Screenshot: Luminance intensity within a Luminance Histogram
The horizontal axis shows the possible luminance values between 0 and 255. Due to
limited space 4 luminance values are always generalized to one value. The vertical
axis shows the respective frequencies. The above given example shows a certain ac-
cumulation at maximum luminance and a second accumulation at less luminance.
This enables perfect guidance track recognition. However, a black-and-white check
pattern will give the same luminance picture, but at the same time be completely use-
less for track recognition. Therefore two additional diagrams are available.
Luminance-Histogram press any key to return
200:.......................O.......................................O
190:.......................O.......................................O
180:.......................O.......................................O
170:......................OO.......................................O
160:......................OO.......................................O
150:......................OO.......................................O
140:......................OO.......................................O
130:......................OO.......................................O
120:......................OO.......................................O
110:......................OO.......................................O
100:....................o.OO......................................oO
90:....................O.OO......................................OO
80:....................OOOO......................................OO
70:....................OOOO......................................OO
60:....................OOOOo.....................................OO
50:....................OOOOO.....................................OO
40:....................OOOOO.....................................OO
30:....................OOOOO.....................................OO
20:....................OOOOO.....................................OO
10:..............o.....OOOOO.....................................OO
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---
0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240