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Method for automatically regulating and controlling external fill light for license plate identification

A technology of license plate recognition and supplementary light, which is applied in the field of license plate recognition, can solve the problems of supplementary light for vehicles with various heights, and the fixed illumination angle and light intensity of supplementary light, so as to avoid excessive light and adjust flexibly , to ensure accurate results

Active Publication Date: 2016-09-07
招商新智科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The present invention proposes an automatic control method of an external supplementary light for license plate recognition to solve the problem in the prior art that the illumination angle and intensity of the supplementary light are fixed and it is difficult to accurately supplement the light for vehicles of various heights , to achieve the purpose of adjusting the lighting angle and intensity of the fill light according to the actual situation

Method used

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  • Method for automatically regulating and controlling external fill light for license plate identification

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Embodiment 1

[0023] Such as figure 1 An automatic control method for an external supplementary light for license plate recognition is shown, comprising the following steps:

[0024] a. Obtain the light intensity of the license plate recognition area and the height of the vehicle before the vehicle enters the license plate recognition area; b. According to the obtained vehicle height, adjust the fill light angle by the following formula: Y=60X-60; where Y is The angle between the light emitted by the supplementary light and the horizontal plane, X is the height of the vehicle; c, according to the obtained light intensity, adjust the actual power of the supplementary light, the higher the obtained light intensity, the smaller the actual power of the supplementary light; The lower the light intensity obtained, the greater the actual power of the fill light. Wherein, said step b and step c are carried out simultaneously. The relationship between the actual power of the supplementary light in...

Embodiment 2

[0030] An automatic control method for an external supplementary light for license plate recognition. On the basis of Example 1, a car with a height of 1.6m is about to pass through the license plate recognition area. At this time, the light intensity in the license plate recognition area is obtained by the illuminance sensor as 300 lux. , then adjust the angle between the light emitted by the supplementary light and the horizontal plane to be 36 degrees, and adjust the actual power of the supplementary light to 40 watts at the same time, which can quickly ensure the light angle and brightness of the supplementary light when the vehicle passes through the license plate recognition area are in the preferred position,

Embodiment 3

[0032] An automatic control method for an external supplementary light for license plate recognition. On the basis of Example 1, a medium-sized van with a height of 2m is about to pass through the license plate recognition area. At this time, the light intensity in the license plate recognition area is obtained by the illuminance sensor. The light intensity is 550 lux , then adjust the actual power of the fill light to 0, that is, turn off the fill light. At this time, the angle between the light emitted by the supplementary light and the horizontal plane is 60 degrees, but since the supplementary light is in a closed state, whether the angle is adjusted or not will not affect the specific application of the present invention.

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Abstract

The invention discloses a method for automatically regulating and controlling an external fill light for license plate identification. The method includes the steps of obtaining the illumination intensity of a license plate identification area and the vehicle height before a vehicle entering into the license plate identification area, adjusting the angle of the fill light based on the formula Y=60X-60 according to the obtained vehicle height, with the Y being the included angle between the irradiating light of the fill light and the horizontal plane and X being the vehicle height, and adjusting the actual power of the fill light according to the obtained illumination intensity. The higher the obtained illumination intensity, the lower the actual power of the fill light, and the lower the obtained illumination intensity, the higher the actual power of the fill light. The method solves the problem that the illumination angle and illumination intensity of the fill light in the prior art remain unchanged, and light supplement for vehicles various in height can not be accurately done. The illumination angle and illumination intensity of a fill light can be adjusted according to actual situations.

Description

technical field [0001] The invention relates to the field of license plate recognition, in particular to an automatic control method for an external supplementary light for license plate recognition. Background technique [0002] License plate recognition technology is an application of computer video image recognition technology in vehicle license plate recognition. License plate recognition is one of the important components of modern intelligent transportation systems, and it is widely used. Based on digital image processing, pattern recognition, computer vision and other technologies, it analyzes the vehicle images or video sequences captured by the camera, and obtains the unique license plate number of each car, thus completing the recognition process. Through some follow-up processing methods, functions such as parking lot fee management, traffic flow control index measurement, vehicle positioning, car anti-theft, expressway overspeed automatic supervision, red light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/017
CPCG08G1/0175
Inventor 王金虎
Owner 招商新智科技有限公司
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