Adaptive updating processor for use in an area correlation video

Details Adaptive updating processor for use in an area correlation video Adaptive updating processor for use in an area correlation video

1978-09-21

1980-10-07

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250203CT, H04N 718

Patent

active

042272122

ABSTRACT:
In an area correlation video tracker, a reference subarray of picture elements acquired from a selected track window array of picture elements of an acquisition video frame is cross-correlated in accordance with a predetermined metric function with the picture elements of the selected track window array of each of a number of video frames generated subsequent the acquisition video frame. From these cross-correlations, a minimum cross-correlation value is derived and a subarray of picture elements associated therewith is identified in the track window array of the subsequently generated video frames. An adaptive threshold processor performs autocorrelations in accordance with the predetermined metric function with the video information of the acquisition frame to derive a reference threshold correlation value and with the video information of each of the number of subsequently generated frames to correspondingly derive another threshold correlation value each. An update condition is rendered in the video frame having a derived one cross-correlation value greater than the reference threshold correlation value. The update condition causes the values of the picture elements of the reference subarray to be replaced with the values of the picture elements of the identified subarray corresponding to the one cross-correlation value and causes the reference threshold correlation value to take on the value of the another threshold correlation value derived in the video frame associated with the one cross-correlation value, whereby subsequent cross-correlations will be performed with the updated values until another update condition is rendered.

REFERENCES:
patent: 3828122 (1974-08-01), McPhee et al.
patent: 3829614 (1974-08-01), Ahlbom et al.
patent: 3903357 (1975-09-01), Woolfson et al.
patent: 3955046 (1976-05-01), Ingham et al.
patent: 4133004 (1979-01-01), Fitts

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