Video processing for human occupancy detection

A computer-readable non-transitory medium comprising one or more instructions for determining occupancy in a video stream, that when executed on a processor, configure the processor to:

• process a plurality of frames of the video stream, wherein for a given frame, processing comprises localizing one or more foreground areas in a foreground map and generating a motion map;
• wherein:
• localizing the one or more foreground areas in the foreground map comprises integrating, on a per pixel basis, foreground pixel values in the foreground map over a moving window of foreground maps, and
• integrating the foreground pixel values comprises computing, using a first order infinite impulse response filter, an integrated value for a given pixel based on a weighted sum of a previous integrated value and a present foreground pixel value for the given pixel;
• generate a time-series signal based on the localized one or more foreground areas and the motion map;
• and
• determine whether there is occupancy in the video stream based on temporal analysis of the time-series signal, wherein the temporal analysis determines whether peaks of the time-series signal are uncorrelated that indicates occupancy.

A method for determining occupancy in a video stream, comprising:

• processing a plurality of frames of the video stream, wherein for a given frame, processing comprises localizing one or more foreground areas in a foreground map and generating a motion map, wherein generating the motion map comprises accumulating, on a per pixel basis, difference pixel values over a moving window of difference maps, and summing motion pixel values of the motion map in the one or more foreground areas to generate a sample of a time-series signal;
• generating the time-series signal based on a plurality of samples of the time-series signal generated by the processing of the plurality of the frames of the video stream;
• and
• determining whether there is occupancy in the video stream based on temporal analysis of the time-series signal, wherein the temporal analysis determines whether peaks of the time-series signal are uncorrelated that indicates occupancy.

A computer-readable non-transitory medium comprising one or more instructions for determining occupancy in a video stream, that when executed on a processor, configure the processor to:

• process a plurality of frames of the video stream, wherein for a given frame, processing comprises localizing one or more foreground areas in a foreground map and generating a motion map;
• generate a time-series signal based on the localized one or more foreground areas and the motion map;
• and
• determine whether there is occupancy in the video stream based on temporal analysis of the time-series signal, wherein the temporal analysis determines whether peaks of the time-series signal are uncorrelated that indicates occupancy.