Document Type and Number:
Japanese Patent JPS4886558
Kind Code:
A
Abstract:
A mechanization employing digital techniques locates and tracks the centroid of an image produced by television (TV) scanning techniques. The TV video signal is processed for changes in level, corresponding to contrast differences between an image and background, and all level changes are stored digitally with coordinate information related to vertical and horizontal positions. Each level change is weighted as a function of displacement from the coordinate axes and summed each scan frame to yield the mean of all level changes recorded. The image as a target is tracked by sensing, digitally, the change of position of the image mean level-change, or centroid, in subsequent TV frames and providing positioning information to the TV camera tracking servomechanism so as to center the image on the TV display.
Application Number:
JP872073A
Publication Date:
November 15, 1973
Filing Date:
January 22, 1973
Export Citation:
International Classes:
G01S3/78; H04N5/30; G01S3/782; G01S3/786; G05D1/00; G05D1/12; G05D3/00; H04N7/18; (IPC1-7): G01S3/78