H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/32
H04N 7/00 (2006.01) G01S 3/786 (2006.01) G01S 13/72 (2006.01)
Patent
CA 1118092
ABSTRACT OF THE DISCLOSURE The present invention provides a correlation follower for tracking an object, comprising an image sensor with a limited field of view and arranged to cyclically scan the said field of view, and a video correlator with two addressable memories one of which has the function of storing in digital form for each scanning cycle a section of the field of view while the other memory is arranged to be updated with the contents of the first memory, the said video correlator being arranged to furnish, once the image sensor has been so aligned that an object is encompassed within the section, an error signal controlling the alignment of the image sensor with the object, the said error signal corresponding to a displacement of the section in the former memory in relation to the section in the latter memory for which a maximum correlation is achieved between the contents of the memories, whereby the updating is made at said displacement, characterized in that the video correlator (3) har means (21, 22) designated to select randomly or according to a predetermined selection rule, with a view to updating the latter memory (14), addresses of positions in the said memory so that said memory (14) at each scanning cycle is updated only partly and in positions that are distributed over the area of the memory (14).
315734
Jonsson Rune
Ludvigsson Georg
Warnstam Lars-Ake
Marks & Clerk
Saab-Scania Aktiebolag
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