Parking lot management system

A parking lot management system, comprising:

• a computer host with a database;
• an entrance sensor arranged near an entrance of a parking lot and communicating with the computer host and a handheld device arranged in a vehicle with a license plate number, the handheld device comprising a near-field communication interface, a display panel and an electronic wallet, wherein when the entrance sensor senses serial number data from the near-field communication interface of the handheld device by near-field communication therewith, the entrance sensor is configured to transmit the serial number data to the computer host for identifying a vehicle status of the vehicle, and to record an entry time data and transmit the entry time data to the computer host, and then to transmit a parking space data of an available parking space based on the database by near-field communication to the handheld device to thereby cause the handheld device to display the parking space data on the display panel;
• an entrance camera arranged near the entrance of the parking lot and communicating with the computer host, wherein when the vehicle passes by the entrance, the entrance camera is configured to capture a first photo of the vehicle for retrieving first license plate number data from the license plate number of the vehicle, and to transmit the first photo and the first license plate number data to the computer host;
• an entrance stop arranged near the entrance of the parking lot and which is configured to open after receiving an entrance permission signal;
• an exit sensor arranged near an exit of the parking lot and communicating with the computer host, wherein when the exit sensor senses the serial number data from the near-field communication interface of the handheld device by near-field communication therewith, the exit sensor is configured to transmit the serial number data to the computer host for performing a first verification by confirming the vehicle status, and to record exit time data and transmitting the exit time data to the computer host, and to deduct a parking fee from the electronic wallet of the handheld device handheld device;
• an exit camera arranged near the exit of the parking lot and to communicating with the computer host, wherein when the vehicle passes by the exit, the exit camera is configured to capture a second photo of the vehicle, for retrieving second license plate number data from the license plate number of the vehicle, and to transmit the second photo and the second license plate number data to the computer host for performing a second verification by comparing the first photo data with the second photo data and comparing the first license plate number data with the second license plate number data;
• and
• an exit stop which is arranged near the exit of the parking lot and is configured to be opened after receiving an exit permission signal generated after the second verification is completed.