Portable covert license plate reader
A surveillance system for covertly monitoring vehicle license plates. A portable covert license plate reader is provided for automatically reading license plate images for each of a plurality of moving vehicles that pass through a field of view of a camera in the reader without detection by the moving vehicles. A mobile surveillance unit is located in proximity to the license plate reader for receiving license plate character strings extracted by the reader, comparing each received image with a list of target plates of interest to law enforcement, and generating an audible alarm and a visual display when a match is found. An operations center is also provided for communicating with the mobile surveillance unit to receive license plate data from the mobile surveillance unit and to provide updates to the list of target plates stored at the mobile surveillance unit.
1. A surveillance system for monitoring a plurality of vehicle license plates comprising:
a portable license plate reader including a camera for automatically imaging a license plate and extracting a character string from the image for each of a plurality of moving vehicles that pass through a field of view of the camera without detection by the moving vehicles;
a mobile surveillance unit positioned in proximity to the license plate reader for receiving the extracted character string from the reader, comparing each extracted character string with a list of target plate numbers, and generating an audible alarm and a visual display when a match is found; and
an operations center for communicating with the mobile surveillance unit to receive each extracted character string from the mobile surveillance unit and to update the list of target plate numbers stored at the mobile surveillance unit.
2. The surveillance system for monitoring vehicle license plates of claim 1 wherein the portable license plate reader comprises:
a camera for imaging of vehicle license plates;
an illuminator cooperative with the camera to provide illumination of the vehicle license plates; and
an image acquisition and processing device coupled to the camera to acquire images of the vehicle license plates from the camera and to extract character strings of each detected license plate.
3. The surveillance system for monitoring vehicle license plates of claim 2 wherein the portable license plate reader further comprises a lighting control device to time and synchronize infrared emissions from the illuminator with each license plate imaging.
4. The surveillance system for monitoring vehicle license plates of claim 2 wherein the portable license plate reader further comprises a wireless communications device for transmitting extracted license plate character strings to the mobile surveillance unit.
5. The surveillance system for monitoring vehicle license plates of claim 1 wherein the mobile surveillance unit comprises:
a wireless communications device for receiving extracted license plate character strings from each license plate reader;
a display device for displaying each received license plate character string;
a storage device for storing the list of target plate numbers and the captured license plate character strings from each license plate reader; and
an onboard processing unit for comparing each received license plate character string with the list of target plate numbers and displaying each license plate character string that matches an entry from the target list.
6. The surveillance system for monitoring vehicle license plates of claim 1 wherein the portable license plate reader is mounted in a transportable structure positioned adjacent to a roadway.
7. The surveillance system for monitoring vehicle license plates of claim 6 wherein the transportable structure is a traffic channelizer or a traffic barrel.
8. A surveillance system for monitoring a plurality of vehicle license plates comprising:
a license plate reader, mounted in a transportable traffic channelizer device, including a camera for automatically imaging a license plate and extracting a character string from the image for each of a plurality of moving vehicles that pass through a field of view of the camera in the reader without detection by the moving vehicles;
a processing unit for receiving each character string extracted by the reader and comparing each received character string with a list of target plate numbers; and
a display device for displaying each license plate character string that matches an entry from the target list.
9. The surveillance system for monitoring a plurality of vehicle license plates of claim 8 wherein the processing unit generates an audible alarm and a visual display on the display device when a match is found.
10. The surveillance system for monitoring a plurality of vehicle license plates of claim 8 wherein the license plate reader comprises:
an illuminator cooperative with the camera to provide illumination of the license plate; and
an image processing device coupled to the camera to acquire images from the camera and to extract the character string of the license plate.
11. The surveillance system for monitoring a plurality of vehicle license plates of claim 8 wherein the license plate reader further comprises a lighting control device to synchronize an infrared emission from the illuminator with the license plate imaging.
12. The surveillance system for monitoring a plurality of vehicle license plates of claim 8 further comprising a storage device for storing the character string and the list of target plate numbers.
13. The surveillance system for monitoring vehicle license plates of claim 8 wherein the transportable traffic channelizer device comprises a traffic channelizer or a traffic barrel.