TW201727539A - A method based on radio frequency identification (RFID) and license plate recognition systems (LPR) to promote accuracy of LPR - Google Patents

Abstract

The present invention provides a method based on radio frequency identification and License Plate Recognition Systems (LPR) to promote accuracy of LPR, it can capture the LPR license plate number and eTag reader also can read the bar code information, and then compare the license plate and vehicle registration data. More particularly, the present invention is to promote the overall system efficiency department and recognition rate of past technology.

Description

Method for improving the correctness of license plates based on wireless radio frequency technology and license plate recognition technology

The present invention generally relates to a license plate data method in combination with a radio frequency technology (RFID) and a license plate recognition technology.

In the past, when identifying a vehicle, it is necessary to select a picture through the license plate recognition technology (LPR) to find a Region of Interest (ROI), that is, the position of the license plate, to perform the license plate character capture, and finally output the license plate recognition result. However, because the identification often suffers from the surrounding environment, such as dirty license plate, paint off on the license plate, cloudy and insufficient lighting, and other factors that are not suitable for software identification, it is easy to cause the recognition rate to drop, so that the identification result does not match the actual license plate.

The LPR license plate recognition system is a kind of artificial intelligence software technology that uses the license plate number as the vehicle identification. When the vehicle passes a preset image capture point, it informs the control host that the duplex image capture device orders the camera device to take the vehicle license plate image. The identification program will identify each digital character in the license plate and compare it with the license plate database in the computer. If the license plate is an authorized number, the access control can be activated (eg, opening the fence machine, electric door) ...etc. access control automatic control equipment.), It is often used as an intensive management of vehicle control, parking data management, vehicle inspection and prevention of vehicle theft. The LPR license plate recognition system is commonly used for access control in general buildings and communities, car registration in motels and hotels, general parking fees and management systems, automatic access to customer service information for car maintenance plants, road monitoring and traffic statistics, and vehicle inspections. ..... and other uses.

The eTag reader is a technology that uses electric field sensing to read data on a tag. The passive RFID operation architecture uses an antenna to transmit energy and activates a chip on a tag for communication. The main component includes a transceiver antenna module, a control module, and a radio frequency module. The group, the power source, and the reader receive commands from the host side, and the data stored in the tag is transmitted back to the host in a wired or wireless manner, and is combined with the application system. If the reading distance is long, the antenna will be set in a single read, and the size of the antenna will also affect the read distance.

The invention provides a license plate image recognition system combined with a radio frequency technology reading label system, which performs image capture on a specific target object, and simultaneously reads the content of the radio frequency label data on the target object, and then integrates into a set of unique data.

In one embodiment, the present invention provides a license plate recognition result integrated radio frequency tag data, which includes an image recognition method and tag code reading integration technology. The image recognition method comprises the following steps: obtaining a camera image; selecting an area of interest in each image and capturing features of the region of interest; extracting each license plate character according to the captured feature, and finally outputting the image Identify the results. The tag code reading integration technology triggers the reading signal according to the target, and no The line RF reader reads the radio frequency tag (Tag) on the target object, reads the inner code (TID) of the tag, and reads the inner code to be integrated with the license plate identification result, which will be transmitted through the present invention. Integrate methods to get a unique set of information.

In summary, the present invention is to improve the overall efficiency and recognition rate of the system of the prior art, so that the recognition rate reaches 100%, and the risk of past identification errors is improved.

The present invention has been described in detail by the preferred embodiments of the present invention, however, without departing from the spirit and scope of the invention.

From the above detailed description, those skilled in the art can understand that the present invention can achieve the foregoing objects, and has already met the requirements of the Patent Law, and has filed an invention patent application according to law.

Figure 1. The method of image integration

201~211‧‧‧Steps

FIG. 1 is a schematic flow chart of an embodiment of a method according to the present invention.

For the purpose of the present invention, the technical content, the procedure of the steps, and the concept of the design are explained in the following, so that the reviewer can understand the present invention. Features, detailed descriptions are as follows: When the system starts to execute, as shown in Figure 1, when a vehicle enters the identification area, two sets of cameras and a group of RFID readers in the system will start receiving the start message. Steps 201 and 202 are license plate recognition systems, and each vehicle enters a set of license plate photos and identification results. So you can receive the same two sets at the same time. Car photos and license plate results. At step 203, the RFID reader is activated to attempt to read the inner code (TID) of the ultra high frequency (UHF) tag installed on the vehicle.

After a period of system time, proceeding to step 204, the system integrates the two sets of license plate identification results with the tag TID of the vehicle, and determines whether the tag is read, because not all vehicles currently have UHF tags attached. If the tag is read, the process proceeds to step 205 for the database comparison operation, and the tag TID code is used as the unique code (Key) as the identification code, and is used to query the tag code in the database and the corresponding license plate data table (below) Referred to as the database license plate).

Step 206 compares the license plate identification result with the corresponding license plate of the tag code in the database, and compares whether the vehicle identification result is the same as the corresponding license plate. If the same representation is correct, the system proceeds to step 210 to output the license plate result. .

If no car recognition result is the same as the license plate license in step 206, the process proceeds to step 207 to compare the two sets of license plate identification data. If the two car discrimination results are the same, the system directly outputs the license plate result. If not, proceed to step 208 to check whether the license plate recognition 1 has been successfully identified, and if successful, output the result. If not, proceed to step 208. For the same process as 208, please refer to the above process. If there is still no identification result, no license plate recognition result is output.

Finally, in step 212, since the RFID reader reads the tag code, each car identification result and the tag code are recorded and stored in a storage medium such as a database, and can be used for query later.

Figure 1. The method of image integration

201~211‧‧‧Steps

Claims (3)

A method based on license plate recognition combined with radio frequency technology to improve the correctness of license plate recognition: comprising the following steps: intercepting the license plate position by the license plate recognition system, and receiving the license plate result output; meanwhile, the radio frequency reading device performs tag data reading, according to Read the results and compare the license plate database. According to the license plate corresponding to the license plate in the database and the identification result of the license plate recognition system, input to the comparison process, and output the correct license plate according to the license plate comparison method. For example, the license plate comparison process described in claim 1 of the patent scope. The outline of the database used in the license plate comparison process described in item 1 of the patent application scope is designed.