TM Conveyor Tracking
Software version: TMflow 1.76
12
2.4.1 Lens
It is strongly recommended to use an industrial-grade C/CS Mount lens. The lens focal distance
should be set based on the real-world applications.
Lens selection example (object is 500 mm away from the camera)
Reference for calculation:
When using a 12 mm lens, the field is 232 x 174 mm
2
; pixel resolution is 232/2590 ~ 0.09
mm/pixel.
When using an 8 mm lens, the field is 351 x 263 mm
2
; pixel resolution is 351/2590 ~ 0.14
mm/pixel.
2.5 Reference Guide for Light Source Setup
To obtain decent image quality and rapid imaging time, it is strongly recommended that the light source
intensity of the image range can reach to 2500 Lux, with uniformity higher than 90% to avoid light
reflection.
At light levels below 2500 LUX, it may be necessary to increase the camera exposure time and
decrease the conveyor belt speed.
For example (when the camera is 500 mm from the focus object):
When the light intensity is 2500 Lux, exposure time setting should be set as 0.5 msec, and the conveyor
speed shall be set to 300 mm/sec;
Calculation of Uniformity
：
Divide the camera field into a 3 x 3 grid as in the following figure. Measure the brightness in
the center of each cell and obtain the maximum and minimum value,
Substitution
：
Uniformity =
�
1
−
(
𝑀𝑀𝑀𝑀𝑀𝑀 − 𝑀𝑀𝑀𝑀𝑀𝑀
)
(
𝑀𝑀𝑀𝑀𝑀𝑀
+
𝑀𝑀𝑀𝑀𝑀𝑀
)
�
× 100%
