Automated recalibration of sensors for monitoring an area of real space

A system including one or more processors and memory accessible by the processors, the memory loaded with computer instructions recalibrating cameras in a real space for tracking puts and takes of items by subjects between inventory caches which can act as at least one of sources and sinks of inventory items in exchanges of inventory items, which computer instructions, when executed on the processors, implement actions comprising:

• first processing one or more images selected from a plurality of sequences of images received from a plurality of cameras, in which selected images in the plurality of sequences of images have respective fields of view in the real space, to:
• obtain, based upon one or more features (i) corresponding to points located at displays or relatively immobile structures extracted from the selected images using a trained neural network classifier and (ii) matched with features from a set of calibration images, transformation information between the selected images and the set of calibration images;
• and
• update calibration of a camera with the transformation information whenever the transformation information for the camera meets or exceeds a first threshold.

A method for recalibrating cameras in a real space for tracking puts and takes of items by subjects, the method including:

• first processing one or more images selected from a plurality of sequences of images received from a plurality of cameras, in which selected images in the plurality of sequences of images have respective fields of view in the real space, to:
• obtain, based upon one or more features (i) corresponding to points located at displays or relatively immobile structures extracted from the selected images using a trained neural network classifier and (ii) matched with features from a set of calibration images, transformation information between the selected images and the set of calibration images;
• and
• update calibration of a camera with the transformation information whenever the transformation information for the camera meets or exceeds a threshold;
• and
• second processing sequences of images of the plurality of sequences of images, to track puts and takes of items by subjects within respective fields of view in the real space;
• and
• wherein first processing and second processing occur substantially contemporaneously, thereby enabling cameras to be calibrated without clearing subjects from the real space or interrupting tracking puts and takes of items by subjects.