Behind the windshield camera-based perception system for autonomous traffic violation detection
Disclosed herein are systems and apparatus for detecting a traffic violation. In one embodiment, a system for detecting a traffic violation comprises a context camera assembly and a license plate recognition (LPR) camera assembly. The context camera assembly can comprise a context camera housing containing a context camera, a context camera mount configured to mount the context camera housing to an interior of a carrier vehicle, and a context camera skirt coupled to and protruding outwardly from the context camera housing. The license LPR camera assembly can comprise an LPR camera housing containing one or more LPR cameras, an LPR camera mount configured to mount the LPR camera housing to the interior of the carrier vehicle, and one or more LPR camera skirts coupled to and protruding outwardly from the LPR camera housing.
1. A license plate recognition (LPR) camera assembly, comprising:
an LPR camera housing containing one or more LPR cameras configured to capture videos containing one or more license plates of one or more vehicles involved in a traffic violation event;
an LPR camera mount coupled to the LPR camera housing and configured to mount the LPR camera housing to an interior of a carrier vehicle at an angle with respect to a windshield of the carrier vehicle;
a plurality of infrared (IR) lights configured to illuminate an event scene of the traffic violation event; and
at least one LPR camera skirt coupled to and protruding outwardly from the LPR camera housing, wherein the at least one LPR camera skirt is configured to prevent reflected IR light from interfering with the videos captured by the one or more LPR cameras,
wherein the at least one LPR camera skirt comprises an outer LPR camera skirt and an inner LPR camera skirt at least partially shrouded or surrounded by the outer LPR camera skirt,
wherein the outer LPR camera skirt comprises a first outer camera skirt lateral side and a second outer camera skirt lateral side,
wherein the inner LPR camera skirt comprises a first inner camera skirt lateral side and a second inner camera skirt lateral side, and
wherein the length of at least one of the second inner camera skirt lateral side and the first inner camera skirt lateral side is determined based on an angle made by the second outer camera skirt lateral side and a windshield of the carrier vehicle.
2. The LPR camera assembly of claim 1 , wherein the one or more LPR cameras comprises a daytime LPR camera configured to capture videos in a visible spectrum and a nighttime LPR camera configured to capture videos in an IR spectrum.
3. The LPR camera assembly of claim 2 , further comprising an IR blocking filter covering at least part of the daytime LPR camera.
4. The LPR camera assembly of claim 1 , wherein the plurality of IR lights are arranged in an array.
5. The LPR camera assembly of claim 1 , wherein the plurality of IR lights are arranged to surround or partially surround at least one of the LPR cameras.
6. The LPR camera assembly of claim 1 , wherein a length of the first outer camera skirt lateral side is greater than the length of the second outer camera skirt lateral side.
7. The LPR camera assembly of claim 6 , wherein a length of the first inner camera skirt lateral side is greater than the length of the second inner camera skirt lateral side.
8. The LPR camera assembly of claim 1 , wherein the length of the first inner camera skirt lateral side is less than the length of the first outer camera skirt lateral side.
9. The LPR camera assembly of claim 1 , further comprising an IR bandpass filter covering the plurality of IR lights.
10. The LPR camera assembly of claim 1 , wherein the LPR camera mount is configured to mount the LPR camera housing to a ceiling or headliner of the carrier vehicle.
11. The LPR camera assembly of claim 10 , wherein the LPR camera mount is configured to mount the LPR camera housing such that a distal skirt edge of the at least one LPR camera skirt is positioned less than 3.0 cm from a windshield of the carrier vehicle but does not physically contact the windshield of the carrier vehicle.
12. The LPR camera assembly of claim 1 , wherein the at least one LPR camera skirt has a skirt thickness of between 2.00 mm and 2.50 mm.