VEHICLE LICENSE PLATE RECOGNITION SYSTEM WITH A DEVICE FOR MEASURING ILLUMINATION AND THE METHOD FOR IMPROVING THE DEFINITION OF VEHICLE LICENSE PLATE IMAGE THEREBY

摘要

The present invention is an optimal license plate light intensity by measuring the ambient light for the illumination measurement structure at the entry road surface roughness measuring comprising the structure, and light intensity sensor provided on the coloring, and the vehicle license plate recognition system with the color of the same conditions and license plates operation, and that the calculated proportion to the optimal license plate light intensity due to, by controlling the aperture of the camera backlight and sungwang by the movement path of the sun, as well as a sunny day, and on a cloudy day, and symptoms and partly often obscuring the sun illumination change It relates to the always clear of the vehicle license plate using a roughness measuring structure comprising a vehicle license plate recognition system, and a system that allow to obtain the image of the license plate image sharpness improvement method, regardless.; The invention first illuminance sensor, and the MPU to control the A / D converter, and a camera, strobe, by outputs a vehicle sensing unit breaker, a diaphragm drive section for converting the output of the first illumination sensor to a digital signal, the MPU a vehicle license plate recognition system, made by the trigger signal output to the computer that analyzes the license plate image sent from the camera to recognize the license plate number from a base which is formed a ball secured to the two sides to have a rectangular shape to secure the road surface and and, with the fastening bottom plate to maintain a constant height is provided on the upper surface of the base of the portion except for the ball and mounted to the upper portion of the lower plate is formed wider in the transverse direction than said lower plates the upper plate projecting portion is formed, the front surface of the projection is the same white bands and green color band and the license plate is formed by halves Air was made for roughness measurement structure is provided, wherein the first brightness sensor installed fixed for the roughness measurement structure on the road surface central portion of the road, and is one to sense the light intensity of the white band), and a green band is formed in the front portion of the projecting portion that is characterized.; Further, the present invention provides A / D converter to convert the first illumination sensor and an output of the first light intensity sensor for sensing the illumination of the green band and a white stripe formed on the front side of the protrusion-in for roughness measurement structure to a digital signal , the train number recognition consisting of the MPU to control the camera, a strobe, a circuit breaker, a diaphragm drive section by an output vehicle detecting portion, the computer that is the license plate image transmitted from the camera by the trigger signal output from the MPU analyzes recognize the license plate number in the system, the first illumination intensity for computing a luminance value of said light intensity measuring structure for reading the output information from the sensor operation process and, roughness values ​​of the structure for the light intensity measurement calculated by the illuminance calculation process and stored in the database as the data extracted by the data extraction process and the data extraction process of extracting the iris control data are compared with each other crude And it controls the re-opening ET is characterized in comprising a diaphragm adjusting process for adjusting the aperture.