1. Low-power object detection hardware, comprising: a hardware scanning window array for storing data based on a two-dimensional sample window of an image; computer vision feature computation hardware configured to compute one or more computer vision features based on the data stored in the hardware scanning window array; and a hardware classifier configured to receive the one or more computer vision features computed by the computer vision feature computation hardware and to determine whether a reference object is detected within the two-dimensional sample window of the image.