An automatic control method for license plate recognition external supplementary light
A license plate recognition and fill light technology, applied in the field of license plate recognition, can solve the problems of difficult to fill light for vehicles of various heights, the angle and light intensity of the fill light are fixed, etc. , to ensure accurate results
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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 fill 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 300 lux obtained by the illuminance sensor , then adjust the angle between the light emitted by the supplementary light and the horizontal plane to 36 degrees, and adjust the actual power of the supplementary light to 40 watts, 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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