For correct recofnition of carriages plates image received from video cameras should be clear, contrast and readable for use.
Requirements for video camera selecting, mounting and setup to get the required image quality are follows.
Requirements for video camera characteristics:
Using of resolution higher than 800x600 (IP-cameras) or CIF2 (analog cameras) is not lead to working improved quality.
It is strongly recommended to use resolution 800x600 (IP-cameras) or CIF2 (analog cameras).
Use varifocal lens for settings simplicity. Range of focal distance changing choose for each case of system installation.
It is required to fulfill video camera mounting and setup requirements except requirements for video cameras properties.
Requirements for video camera position:
Also it's required while video camera setup:
It's required that distance between video camera and digitizing device won't be more than 30 meters for prevention video signal attenuation.
To provide working of system at night use searchlight flashing of carriages/cisterns. Use usual halogen spotlight with a capacity of 1–1,5 kW while mounting spotlight in distance 5-7 meters from railway. Locate spotlight as shown in the figure below. Such location allows to avoid the following:
Reference image received from correctly mounted and setup video camera is shown in the following figure.