CAMERA CALIBRATION FOR UNDEREXPOSED CAMERAS USING TRAFFIC SIGNAL TARGETS
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United States of America Patent
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Issued Date -
Jan 11, 2024
app pub date -
Jul 7, 2022
filing date -
Jul 7, 2022
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status (Latency Note)
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Abstract
The present technology pertains to determining whether traffic signal cameras of an AV are miscalibrated. One technique for determining if a given traffic signal camera is miscalibrated includes obtaining an image from a traffic signal camera, marking the location of a traffic signal in the image with a bounding box, and determining if the light sources of the traffic signal are within the bounding box. If not, an alternate reason check is performed to determine whether an alternate reason exists for why the light source of the traffic signal is not within the bounding box. If no such reason exists, then the traffic signal camera may be miscalibrated. An additional calibration check may be performed using images from two traffic signal cameras of the AV each having four common light sources, and performing a homographic computation using the location of the light sources in the images.
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