Method for operating a parking assistance, computer program product, parking assistance system, vehicle and system

A parking assistance system for a vehicle, comprising:

• a receiving unit for receiving an optical image of an environment of the vehicle and a digital environment map representing the environment of the vehicle, the digital environment map including at least one designated parking area,
• a selecting unit for selecting, for each of the at least one designated parking areas, a region of interest in the received optical image corresponding to the respective designated parking area,
• a detecting unit for detecting, in each selected region of interest, lines and/or symbols provided on the ground,
• an assigning unit for assigning one of a plurality of parking slot classes to each selected region of interest based on the detected lines and/or symbols, and
• a determining unit for determining, for each of the at least one designated parking areas, that the respective designated parking area corresponding to the selected region of interest is a potential parking slot based on the parking slot class assigned to the corresponding region of interest.