公开(公告)号：US3829614A

公开(公告)日：1974-08-13

申请号：US32581473

申请日：1973-01-22

Applicant: SAAB SCANIA AB

Inventor： AHLBOM S ,  HANSSON S

IPC: G01S3/786 ,  H04N7/18

CPC classification number: G01S3/7865 ,  G01S3/7864

Abstract: In a video tracker, each scan line is broken into a predetermined number of uniform short segments. An electronic tracking window thus comprises a matrix of data points, each a line segment, and its edges are on coordinates defined by data points. Video signal content of each line segment in the window area is digitized by comparison to automatically adjustable reference level signals and generation of either a ''''one'''' or a ''''zero'''' bit, depending upon relationship of video signal content to reference levels. For each frame scanned, data points in the window are compored, set by set, with a bit pattern preselected for best correspondence to target configuration, comparisons being made sequentially across and down the window. A correlation number is obtained for each comparison. Location and value of the highest correlation number for each scan is stored and used for tracking.