Human-body detecting device, image forming apparatus, human-body detecting method, and computer program product

摘要

A human-body detecting device includes a first sensor and a control unit. The first sensor outputs a first signal according to a distance between the human-body detecting device and a user. The control unit finds a first weighted average of first signals weighted with a first weight and a second weighted average of the first signals weighted with a second weight different from the first weight, and detects, when a difference between the first weighted average and the second weighted average has exceeded a predetermined value, that the user is located within a predetermined range from the human-body detecting device.