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Light sensation and environment light supplementation control system of parking lot vehicle license plate recognition system
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A technology of license plate recognition and control system, applied in the field of light sensing and environmental supplementary light control system, can solve problems such as manual adjustment of position, waste of electric energy, inability to guarantee brightness, etc., and achieve the effect of good conditions
Pending Publication Date: 2018-11-06
南泽(广东)科技股份有限公司
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In order to extract accurate license plate number information from image analysis, there are certain requirements for the brightness of the license plate on the image. However, as the ambient brightness changes during shooting, it is determined whether lights are needed. The brightness of the required lights is not fixed, and there may not be any on the camera. Fill light, cameras with fill light usually need to manually adjust the position, which cannot guarantee the brightness required for recognition when shooting
If you keep the lights on all the time, it will cause a waste of electricity
Method used
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Embodiment example 1
[0027] (1) The car is parked in the parking space in front of the camera, the infrared sensor senses the vehicle, and the detection result is sent to the controller.
[0029] (3) After receiving the analog electrical signal, the controller compares the measured voltage and turns on the LED light at 5W.
[0030] (4) When the vehicle leaves the sensing area of the infrared sensor, the controller disconnects the LED light circuit, and the LED light goes out.
Embodiment example 2
[0032] (1) The car is parked in the parking space in front of the camera, the infrared sensor senses the vehicle, and the detection result is sent to the controller.
[0033] (2) The controller turns on the semiconductorphotodetector, the ambient illumination is 200 lx, and the incident light signal is converted into an analog electrical signal by using the photoelectric effect, and the analog electrical signal is sent to the controller.
[0034] (3) After the controller receives the analog electrical signal, it compares the measured voltage and turns on the LED light for 3W.
[0035] (4) When the vehicle leaves the sensing area of the infrared sensor, the controller disconnects the LED light circuit, and the LED light goes out.
Embodiment example 3
[0037] (1) The car is parked in the parking space in front of the camera, the infrared sensor senses the vehicle, and the detection result is sent to the controller.
[0038] (2) The controller turns on the semiconductor photodetector, and the ambient illumination is 500lx. Using the photoelectric effect, the incident light signal is converted into an analog electrical signal, and the analog electrical signal is sent to the controller.
[0039] (3) After the controller receives the analog electrical signal, it compares the measured voltage and does not turn on the LED light.
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Abstract
The invention relates to a light sensation and environment light supplementation control system of a parking lot vehicle license plate recognition system. The light sensation and environment light supplementation control system of the parking lot vehicle license plate recognition system comprises a vehicle sensor, a camera, a semiconductor photoelectric detector, a control instrument and an LED lamp. When vehicles exist on exit and entrance passageways, an optical detection component and a lamp control receiving component are turned on, whether to supplement light or not is determined throughcomparison according to the environment brightness at that moment, and the light brightness needing light supplementation is determined, so that the environment brightness can be regulated automatically, good conditions can be provided for recognizing vehicle license plates, and energy conservation and environmental friendliness are realized.
Description
technical field [0001] The invention relates to the technical field of light perception and environment supplementary light control, in particular to a light perception and environment supplementary light controlsystem of a parking lot license plate recognition system. Background technique [0002] With the rapid development of computer technology and the improvement of license plate recognition technology, parking lots generally use intelligent transportation systems to capture one frame from the camera video screen for content image analysis, and extract license plate numbers and other information. In order to extract accurate license plate number information from image analysis, there are certain requirements for the brightness of the license plate on the image. However, as the ambient brightness changes during shooting, it is determined whether lights are needed. The brightness of the required lights is not fixed, and there may not be any on the camera. Fill light. Came...
Claims
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Application Information
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