Method and apparatus for detecting parking space usage condition, electronic device, and storage medium

Patent metadata

Field	Value
Publication number	US-11455805-B2
Application number	US-201917057362-A
Country	US
Kind code	B2
Filing date	May 15, 2019
Priority date	May 25, 2018
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A method and an apparatus for detecting a usage status of a parking space, an electronic device, and a storage medium are disclosed. The method comprises: obtaining a monitored image of a to-be-detected parking space; identifying lane line position information of the to-be-detected parking space from the monitored image; identifying vehicle information from the monitored image, wherein the vehicle information comprises vehicle position information; and determining a usage status of the to-be-detected parking space based on a positional relationship between the lane line position information and the vehicle position information. Determining the usage status of the to-be-detected parking space based on the positional relationship between the lane line position information and the vehicle information is less affected by external environmental factors, which thus may improve the accuracy of a detection result of the usage status of the parking space.

First claim

The invention claimed is:

1. A method for detecting a usage status of a parking space, comprising:
obtaining a monitored image of a to-be-detected parking space;
identifying lane line position information of the to-be-detected parking space from the monitored image;
identifying vehicle information from the monitored image, wherein the vehicle information comprises vehicle position information; and
determining a usage status of the to-be-detected parking space based on a positional relationship between the lane line position information and the vehicle position information,
wherein, the vehicle information further comprises license plate information;
the step of determining a usage status of the to-be-detected parking space based on a positional relationship between the lane line position information and the vehicle position information, comprises:
if an intersection between a parking space range indicated by the lane line position information and a vehicle range indicated by the vehicle position information is larger than a preset parking threshold and a vehicle corresponding to the vehicle position information has a license plate, calculating a distance from a center of the license plate to a left parking space line of the to-be-detected parking space based on the lane line position information and the license plate information as a first left-parking-space-line distance, and calculating a distance from the center of the license plate to a right parking space line of the to-be-detected parking space based on the lane line position information and the license plate information as a first right-parking-space-line distance;
determining whether the first left-parking-space-line distance, the first right-parking-space-line distance, and a width of the license plate meet a preset intersection-line condition;
if the first left-parking-space-line distance, the first right-parking-space-line distance, and the width of the license plate do not meet the preset intersection-line condition, determining that the usage status of the to-be-detected parking space is that a vehicle is being parked normally in the to-be-detected parking space; and
if the first left-parking-space-line distance, the first right-parking-space-line distance, and the width of the license plate meet the preset intersection-line condition, determining that the usage status of the to-be-detected parking space is that a vehicle is being intersection-line parked in the to-be-detected parking space.

2. The method of claim 1 , wherein, determining a usage status of the to-be-detected parking space based on a positional relationship between the lane line position information and the vehicle position information, comprises:
if a parking space range indicated by the lane line position information does not intersect with a vehicle range indicated by the vehicle position information, determining that the usage status of the to-be-detected parking space is that no vehicle is parked in the to-be-detected parking space; and
if the parking space range indicated by the lane line position information intersects with the vehicle range indicated by the vehicle position information, determining that the usage status of the to-be-detected parking space is that a vehicle is being parked in the to-be-detected parking space.

3. The method of claim 2 , wherein, if the parking space range indicated by the lane line position information intersects with the vehicle range indicated by the vehicle position information, determining that the usage status of the to-be-detected parking space is that a vehicle is being parked in the to-be-detected parking space, comprises:
if the parking space range indicated by the lane line position information intersects with the vehicle range indicated by the vehicle position information and the vehicle range does not intersect with a lane line indicated by the lane line position information, determining that the usage status of the to-be-detected parking space is that the vehicle is being parked normally in the to-be-detected parking space; and
if the parking space range indicated by the lane line position information intersects with the vehicle range indicated by the vehicle position information and the vehicle range intersects with the lane line indicated by the lane line position information, determining that the usage status of the to-be-detected parking space is that the vehicle is being intersection-line parked in the to-be-detected parking space.

4. The method of claim 1 , wherein, the vehicle information further comprises license plate information;
the step of determining a usage status of the to-be-detected parking space based on a positional relationship between the lane line position information and the vehicle position information, comprises:
if an intersection between a parking space range indicated by the lane line position information and a vehicle range indicated by the vehicle position information is larger than a preset parking threshold and a vehicle corresponding to the vehicle position information does not have a license plate, determining a simulated center position and a simulated license plate length of a simulated license plate of this vehicle;
calculating a distance from the simulated center position to a left parking space line of the to-be-detected parking space as a second left-parking-space-line distance and calculating a distance from the simulated center position to a right parking space line of the to-be-detected parking space as a second right-parking-space-line distance;
determining whether the second left-parking-space-line distance, the second right-parking-space-line distance and the simulated license plate length meet a preset intersection-line condition;
if the second left-parking-space-line distance, the second right-parking-space-line distance and the simulated license plate length does not meet the preset intersection-line condition, determining that the usage status of the to-be-detected parking space is that a vehicle is being parked normally in the to-be-detected parking space; and
if the second left-parking-space-line distance, the second right-parking-space-line distance and the simulated license plate length meets the preset intersection-line condition, determining that the usage status of the to-be-detected parking space is that a vehicle is being intersection-line parked in the to-be-detected parking space.

5. The method of claim 1 , wherein, determining whether the first left-parking-space-line distance, the first right-parking-space-line distance, and a width of the license plate meet a preset intersection-line condition, comprises:
calculating an absolute value of a difference between the first left-parking-space-line distance and the first right-parking-space-line distance; and
if a ratio of the absolute value of the difference to the width of the license plate is larger than a preset intersection-line threshold, determining that the first left-parking-space-line distance, the first right-parking-space-line distance, and the width of the license plate meet the preset intersection-line condition; if the ratio is not larger than the preset intersection-line threshold, determining that the first left-parking-space-line distance, the first right-parking-space-line distance, and the width of the license plate do not meet the preset intersection-line condition.

6. The method of claim 5 , wherein, when the to-be-detected parking space is a single-parking space, the preset intersection-line threshold is an intersection-line threshold for the single-parking space; when the to-be-detected parking space is a left parking space of a dual-parking space, the preset intersection-line threshold is an intersection-line threshold for the left parking space of the dual-parking space;

Assignees

• Hangzhou Hikvision Digital Tec

Inventors

• Lu Chao

Classifications

• G06V20/625

  License plates · CPC title

• G06V20/586

  of parking space · CPC title

• G06V20/54 Primary

  of traffic, e.g. cars on the road, trains or boats · CPC title

• G08G1/0175 Primary

  by photographing vehicles, e.g. when violating traffic rules · CPC title

• G06T7/70

  Determining position or orientation of objects or cameras (camera calibration G06T7/80) · CPC title