Vehicle object detection system and method for detecting a target object in a detection area located behind a subject vehicle

A vehicle object detection system (10) for detecting a target object (60) in a detection area (OL) located behind a subject vehicle (50), the vehicle object detection system (10) comprising:

• judging means (20) configured to generate a judgement on whether a target object (60) which has been detected to enter the detection area (OL) is an alert object, and to output the judgement to warning means (30) which is configured to output a warning to a driver of the subject vehicle (50) that a target object (60) is present in the detection area (OL) behind the subject vehicle (50) based on the judgement indicating that the target object (60) is an alert object,
• wherein the judging means (20) is configured to delay generating the judgment until a specified period of time has elapsed from a point in time when the target object (60) is detected to enter a detectable area (DA) included in a field of view of a sensor (401, 402), wherein the detectable area overlaps with only a part of the detection area (OL).