Technique for estimation of displacement and/or velocity of obje

Details Technique for estimation of displacement and/or velocity of obje Technique for estimation of displacement and/or velocity of obje

1979-03-16

1980-08-19

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, 358108, 375 28, H04N 712

Patent

active

042187036

ABSTRACT:
A technique for estimation of displacement and/or velocity of objects in television scenes is recursive, in that each displacement calculation is made using the results of the previous calculation. In a first embodiment, a displaced frame difference DFD (i.e., the intensity difference between a spatial location in the present video frame and a location in the previous frame displaced from that location by an initial displacement estimate) is updated using the initial value of DFD normalized by a measure of local picture activity. In a second embodiment, the update is a multiplicative function of DFD and the intensity gradient at the displaced location in the previous frame.

REFERENCES:
patent: 3603725 (1971-09-01), Cutler
patent: 3632865 (1972-01-01), Haskell et al.
patent: 3716667 (1973-02-01), Conner et al.
patent: 3723644 (1973-03-01), Haskell et al.
patent: 3890462 (1975-06-01), Limb et al.

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