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 perception system for detecting a traffic violation, comprising:
a context camera assembly, comprising:
a context camera housing containing a context camera configured to capture videos of a traffic violation event,
a context camera mount coupled to the context camera housing and 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, wherein the context camera skirt is configured to block unwanted ambient light;
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 the traffic violation event,
an LPR camera mount coupled to the LPR camera housing and configured to mount the LPR camera housing to the interior of the carrier vehicle at an angle, laterally, with respect to a windshield of the carrier vehicle, 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 comprises a first camera skirt lateral side and a second camera skirt lateral side, wherein a length of the first camera skirt lateral side is not the same as the length of the second camera skirt lateral side, wherein the at least one LPR camera skirt is configured to block unwanted light; and
a control unit communicatively coupled to the context camera and the one or more LPR cameras and configured to receive videos captured by at least one of the context camera and the one or more LPR cameras and transmit the videos wirelessly to another device.
2. The perception system of claim 1 , wherein the LPR camera assembly further comprises a daytime LPR camera and a nighttime LPR camera.
3. The perception system of claim 2 , wherein the nighttime LPR camera is an infrared (IR) camera.
4. The perception system of claim 2 , wherein the LPR camera assembly further comprises a plurality of infrared (IR) lights to illuminate an event scene.
5. The perception system of claim 4 , wherein the plurality of IR lights are arranged to surround or partially surround the nighttime LPR camera.
6. The perception system of claim 4 , wherein the plurality of IR lights are configured to be arranged as an IR light array.
7. The perception system of claim 4 , wherein emission of IR light by the plurality of IR lights is synchronized with a rate with which the nighttime LPR camera captures video frames or images.
8. The perception system of claim 7 , wherein the plurality of IR lights are periodically powered off to avoid overheating, wherein the powering off of the plurality IR lights is controlled by a control circuit comprising a current limiter, a capacitor, and at least one bipolar junction transistor.
9. 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, laterally, 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 comprises a first camera skirt lateral side and a second camera skirt lateral side, wherein a length of the first camera skirt lateral side is not the same as the length of the second camera skirt lateral side, wherein the at least one LPR camera skirt is configured to prevent unwanted light from interfering with the videos captured by the one or more LPR cameras.
10. The LPR camera assembly of claim 9 , 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.
11. The LPR camera assembly of claim 9 , wherein the plurality of IR lights are arranged in an array.
12. The LPR camera assembly of claim 9 , wherein the plurality of IR lights are arranged to surround or partially surround at least one of the LPR cameras.
13. The LPR camera assembly of claim 9 , 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.
14. The LPR camera assembly of claim 13 , wherein the outer LPR camera skirt comprises a first outer camera skirt lateral side and a second outer camera skirt lateral side, and wherein a length of the first outer camera skirt lateral side is greater than the length of the second outer camera skirt lateral side.
15. The LPR camera assembly of claim 14 , wherein the inner LPR camera skirt comprises a first inner camera skirt lateral side and a second inner camera skirt lateral side, and wherein a length of the first inner camera skirt lateral side is greater than the length of the second inner camera skirt lateral side.
16. The LPR camera assembly of claim 15 , wherein the length of the first inner camera skirt lateral side is less than the length of the first outer camera skirt lateral side.
17. The LPR camera assembly of claim 9 , further comprising an IR bandpass filter covering the plurality of IR lights.