Assisting method and docking assistant for coupling a motor vehicle to a trailer

An assist method for coupling a motor vehicle to a trailer, wherein the motor vehicle is embodied with a trailer coupling, at least one camera, a display and an electronic unit, and wherein the trailer is embodied with a tow bar for the trailer coupling, the method comprising:

• a) capturing a first image of at least one tow bar of a trailer by the camera;
• b) displaying the first image on the display;
• c) selecting a first region in the first image in which the tow bar is located, wherein a coordinate-dependent locating accuracy for the tow bar is allocated to the first region;
• d) enlarging the selected first region to produce a second image;
• e) displaying the second image on the display;
• f) selecting a second region in the second image in which the tow bar is located, wherein an increased coordinate-dependent locating accuracy for the tow bar with respect to the locating accuracy allocated to the first region is allocated to the second region;
• and
• g) determining a trajectory of the motor vehicle for coupling the trailer assuming that the tow bar is located in the second region.