Method of determining parking lot occupancy from digital camera images

摘要

Described herein is a method of determining parking lot occupancy from digital images, including a set-up procedure that includes receiving a layout of a parking lot and estimating parking space volume for at least one viewing angle and the probability that an observed pixel belongs to the parking space volume. The method further includes acquiring one or more image frames of the parking lot from at least one digital camera; performing pixel classification using a vehicle detector on the acquired image frames to determine a likelihood that a pixel belongs to a vehicle; computing a probability that a parking space is occupied by a vehicle based on a spatially varying membership probability density function and a likelihood of vehicle pixels within a region of interest; and determining parking lot vacancy via a comparison of the computed probability that a parking space is occupied by a vehicle to a pre-determined threshold.

主权项

1. A method of determining parking lot occupancy from digital images, the method comprising:
obtaining a layout of a parking lot having a plurality of parking spaces; estimating parking space volume for at least one viewing angle of at least one parking space and the probability that an observed pixel belongs to the parking space volume; acquiring one or more image frames of the parking lot from at least one digital camera; performing pixel classification using at least one vehicle detector on the acquired one or more image frames to determine a likelihood that a pixel corresponds to a vehicle; computing a probability that the at least one parking space is occupied by a vehicle based on a weighted sum of the probability of vehicle pixels within the region of interest of each parking space, wherein the region of interest refers to pixels that can potentially belong to a vehicle parked in a given parking space, wherein the weighted sum comprises a weighting function which gives larger weight to pixels located towards a center of the region of interest of each parking space, the weighting function decreasing the weight of a particular pixel as a distance of the particular pixel to the center increases; and determining parking lot vacancy via a comparison of the computed probability that the at least one parking space is occupied by a vehicle to a pre-determined threshold.