Abnormal Crowd Behavior Detection Based on the Energy Model(5)

Thecrucialattributeoftheimagepotentialenergymodelisthatimagepotentialenergyrelatedtotheobjectisalmostinvariablenomatterhowfartheobjectisfromthecamera.Let denotetheaverage ofonepersonand denotetheestimationofthecrowddensity.Wecanestimatethecrowddensityasfollows:

=

.

(2)

(a)Original

frame(b)

Foreground

(c) (

)

Fig.4.

(d) ( )

Foregroundhistogram.

Thecalculatedhistogramsindicatestheforegrounddis-tributiononthehorizontalandverticaldirection.Fig.4isanexampleofforegroundhistograms.Theframesizeis320*240.

497

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