A virtual reality, VR, system, comprising: a VR headset; a VR controller; a plurality of monitoring stations disposed at different locations, each of the monitoring stations comprising a distinct image sensor (104, 304) to capture images of the VR headset and an environment in which the VR headset is used; an image processing device to: process the images captured by the monitoring stations to detect a plurality of objects in the environment; prioritize the plurality of detected objects according to a risk of collision between the object and the user of the VR headset; transmit, to the VR headset, information comprising notification of the plurality of detected objects in order of the highest determined collision risk; identify an area about the VR headset and the VR controller as corresponding to the user by defining an area extending from above the VR headset to the floor and to a predetermined extension of the VR controller about a central axis corresponding to the user as representing the area occupied by the user of the VR system, wherein the image processing device is to disregard motion detected within the area when detecting objects in the VR operating environment; and detect the objects by detecting movement outside of the area. a VR headset; a VR controller; a plurality of monitoring stations disposed at different locations, each of the monitoring stations comprising a distinct image sensor (104, 304) to capture images of the VR headset and an environment in which the VR headset is used; an image processing device to: process the images captured by the monitoring stations to detect a plurality of objects in the environment; prioritize the plurality of detected objects according to a risk of collision between the object and the user of the VR headset; transmit, to the VR headset, information comprising notification of the plurality of detected objects in order of the highest determined collision risk; identify an area about the VR headset and the VR controller as corresponding to the user by defining an area extending from above the VR headset to the floor and to a predetermined extension of the VR controller about a central axis corresponding to the user as representing the area occupied by the user of the VR system, wherein the image processing device is to disregard motion detected within the area when detecting objects in the VR operating environment; and detect the objects by detecting movement outside of the area. process the images captured by the monitoring stations to detect a plurality of objects in the environment; prioritize the plurality of detected objects according to a risk of collision between the object and the user of the VR headset; transmit, to the VR headset, information comprising notification of the plurality of detected objects in order of the highest determined collision risk; identify an area about the VR headset and the VR controller as corresponding to the user by defining an area extending from above the VR headset to the floor and to a predetermined extension of the VR controller about a central axis corresponding to the user as representing the area occupied by the user of the VR system, wherein the image processing device is to disregard motion detected within the area when detecting objects in the VR operating environment; and detect the objects by detecting movement outside of the area.