Abstract: Devices and techniques are generally described for computer vision techniques for safety hazard detection. A frame of image data representing a physical environment is received. In some examples, a first object represented in the frame of image data may be detected. A determination may be made that the first object is of a first class. A first zone represented in the frame of image data may be identified. The first zone may correspond to a ground surface of the physical environment. A determination may be made that the first object at least partially overlaps with the first zone. A first rule associated with the first zone may be determined. The first rule may restrict objects of the first class from being present within the first zone. Output data may be generated indicating that the first object is at least partially within the first zone, in violation of the first rule.