OBJECT DETECTION USING AUTONOMOUS ROBOT DEVICES

Described in detail herein are methods and systems for detecting absent physical objects using autonomous robot devices. In exemplary embodiments, the system includes shelving units disposed throughout a facility storing sets of physical objects. A first set of machine readable representations can be disposed on the front surface of the shelving unit and a second set of machine readable representations can be disposed on the back wall of the shelving unit. The first and second set of machine readable representations can be encoded with identifiers associated with the sets of physical objects. An autonomous robot device can be configured to detect and read a first set of machine-readable representations in response to successfully detecting and reading the second set of machine readable representations the autonomous robot device can determine the absence of a set of like physical objects.