A method and a device for determining a device parameter of a hearing device to be worn at the ear of a user, the method comprising: obtaining image data of one or more images, the image data including first image data of a first image of the outer human ear at a first angle； identifying, based on the first image data, a first anatomical landmark and a second anatomical landmark of the outer human ear using a processor； identifying the position of the first anatomical landmark and the second anatomical landmark in the first image； determining the device parameter of the hearing device based on the first anatomical landmark and the second anatomical landmark； and outputting the device parameter.
