Video-based parking garage monitoring

A method, comprising:

• obtaining an image captured by a camera installed in a garage, a field of view of the camera including an edge of a doorway of a garage door;
• obtaining data indicating a current time of day;
• determining, for a condition of the garage door being open, an expected illumination level of the image based on the current time of day;
• determining an illumination level of the image;
• based on comparing the illumination level of the image to the expected illumination level of the image, determining that the garage door has opened;
• in response to determining that the garage door has opened, determining that a vehicle position relative to the edge of the doorway satisfies alert criteria based on the image captured by the camera;
• and
• in response to determining that the vehicle position satisfies the alert criteria based on the image captured by the camera, providing to a signaling device installed in the garage, an instruction that causes the signaling device to display a visual alert for a driver of the vehicle, the visual alert indicating a direction in which to steer the vehicle.

A non-transitory computer-readable medium storing software comprising instructions executable by one or more computers which, upon such execution, cause the one or more computers to perform operations comprising:

• obtaining, by the one or more computers, an image captured by a camera installed in a garage, a field of view of the camera including an edge of a doorway of a garage door;
• obtaining, by the one or more computers, data indicating a current time of day;
• determining, by the one or more computers and for a condition of the garage door being open, an expected illumination level of the image based on the current time of day;
• determining, by the one or more computers, an illumination level of the image;
• based on comparing the illumination level of the image to the expected illumination level of the image, determining, by the one or more computers, that the garage door has opened;
• in response to determining that the garage door has opened, determining, by the one or more computers, that a vehicle position relative to the edge of the doorway satisfies alert criteria based on the image captured by the camera;
• and
• in response to determining that the vehicle position satisfies the alert criteria based on the image captured by the camera, providing, by the one or more computers and to a signaling device installed in the garage, an instruction that causes the signaling device to display a visual alert for a driver of the vehicle, the visual alert indicating a direction in which to steer the vehicle.