Tracking operating room phase from captured video of the operating room

A system comprising:

• a plurality of image capture devices positioned at different locations within an operating room and each capturing video of the operating room, wherein each frame of the video comprises objects within the operating room and each object is assigned a state;
• and
• a surgical tracking server coupled to the plurality of image capture devices, the surgical tracking server including a non-transitory computer readable storage medium having instructions encoded thereon that, when executed by a processor, cause the processor to:
• determine a phase of the operating room from a set of predetermined phases by application of one or more phase classification models to the determined states for each identified object, wherein each phase classification model is trained to:
• access a set of rules, each rule corresponding to a phase of the set of predetermined phases and criteria identifying locations of objects within frames of video and a specific state of each object;
• and
• for a frame of the video, determine the phase of the predetermined set corresponding to a rule for which the frame satisfies a maximum number of criteria;
• and
• store the determined phase and a time when the determined phase was determined in association with the operating room.