Manual for VAKI Micro/Macro
Page 19
9
Calibrating and Visibility
When the counter starts, the following tests are performed:
Scan area of the camera.
All bulkheads are detected.
The brightness measured by the camera.
If visibility is not satisfactory, then an error message will appear saying "The visibility is
insufficient, the counter will not count. Check visibility scope. ”The Visibility graph can then help to
find a solution to what is wrong.
9.1 Visibility
Press the Visibility button to display the visibility graph.
The black vertical lines represent the outer edges of the counting field, for a 4-channel Macro
they will also represent the three seperators (bulkheads) between the channels - see the figure
below.
Figure 18 - Visibility of a 4 channel Macro
The Visibility function is used to check that the camera is properly tuned and that the gain of
the light is correct. The function can also be used to detect any impurities or foreign elements that
block the light, or an abnormal tilt of the counter head.
In the figure above, we see a normal curve for the brightness (fluorescent lights shine most in
the middle). The X-axis represents the width of the scanning area in pixels (1 pixel ≈ 0.55 mm). The
