An air conditioner and a method for controlling an air conditioner are provided. The method may include acquiring a top view image for an indoor space using an imaging device and calculating a height of a ceiling in which an indoor device may be mounted; determining whether an image is a human body or an obstacle, with respect to at least one image included in the to view image; and performing control of the indoor device to allow air flow to avoid an obstacle and be discharged toward a human body by controlling driving of an indoor fan or one or more discharge vane provided in the indoor device.