Arecont Vision AV3125 IP Camera Driver
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Arecont Vision AV3125 IP Camera Driver
Transcription 1 Cameras Guide for selection, installation and setting of video surveillance cameras Cameras: According to the Vienna Convention number plate should be formed in such way so it can be recognized under good weather conditions from distance not less than 40 m feet while placed on the axis of the not moving vehicle.
According to the Russian Government Standard number plate should be placed in such way so it can be recognized in the dark from distance not less than 20 m while lighted with vehicle s standard lighting. For recognition it is necessary to make sure that frames with number plates fulfill the following characteristics: Number plate should Arecont Vision AV3125 IP Camera fully placed in the frame; Height of the symbols: List of recommended cameras can be found in the Recommended Equipment section.
It is necessary to use high resolution cameras. Only in such case percentage of correct recognition that is stated in the system characteristics is guaranteed.
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In the dark 50 lux are provided by the standard lighting of the roads for vehicles. This function should be turned on. Arecont Vision AV3125 IP Camera on automatic gain control increases not only video signal, but all noise from matrix as well. The value is set individually for each camera. Image should be sharp.
Sharpness is reached by fixed shutter speed of lens s electronic shutter. Setting of the shutter to the fixed position is the most important parameter.
With high exposure, i. If the declivity angle of roll of the camera relatively to the registration number exceeds 10, it is recommended to reduce the shutter speed half as much for the increasing of picture sharpness.
This is because color cameras while having same characteristics have less sensitivity and pictures appear less sharp. If the above parameters are exceeded, recognition will be carried out with decrease of quality.
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The main installation parameters for video cameras are presented in the Table Name of the parameter Table 2. This places center of the control zone 20 meters from mounted video camera. This places center of the control zone 11 meters from the camera on the center of the lane.
This parameter is adjusted manually or selected automatically. The lower the shutter speed the longer the exposure and the lighter the pictures.
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But as the result of the increasing of each frame shooting time the registration numbers of the vehicles moving with high speed may be found blurred. This is the example of the blurred registration number.
It can be observed from the picture that the vehicle drifted in the frame on 6 pixels during the shooting. As the result the correct recognition is impossible. Cameras which don t allow assigning the shutter speed rate manually cannot be used in the recognition system.
The low shutter speed brings about the smearing effect on the pictures when the registration number seems clear visible on the video. But using the stop-motion view it can be observed that the registration number is blurred.
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To escape the effects shown on the picture it is necessary to disable the automatic shutter speed adjustment and assign it manually in following way: Camera Sharpness To provide the correct registration number recognition the number must be sharp fine in a whole frame. The diaphragm settings and the depth of field should be taken into account during the sharpness adjustment.
More detailed review of this parameter can be received from the Arecont Vision AV3125 IP Camera of lens for your cameras or from the camera manual.