| 摘要 |
A method and apparatus are provided for detecting human motion. The method includes the steps of a camera collecting video images of a secured area, extracting objects in motion from the collected images; for each extracted object determining an object size, correcting the object size for optical depth perception distortion based upon known or derived geometrical and optical information, for each extracted object determining, an object size, an object aspect ratio, an object speed and object motion path track, comparing the distance corrected object size with a statistical bell curve tuned to nominal human size, comparing aspect ratio to a statistical bell curve tuned to nominal aspect ratio of human proportions including one for walking and one for crawling, comparing object speed to a statistical bell curve tuned to nominal travel speed of a typical human including one for walking and one for crawling and comparing object motion path track against ramp function of absolute distance traveled over time, a method for interactive control to reshape and re-characterize each reference bell curve and motion ramp, determining a respective threat probability for each of the extracted object signatures based upon the corrected object size compared with the bell curve tuned to human size, the aspect ratio compared with the bell curves tuned to both walking and crawling, the object speed compared with the bell curves for walking and crawling and upon sustained motion path over time, summing the respective threat probabilities for each extracted moving object based upon size, aspect ratio, speed and sustained motion path and generating an motion alert upon detecting the summed threat probabilities exceeding a programmable threshold value.
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