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Browse Prior Art Database

Motion Following Apparatus

IP.com Disclosure Number: IPCOM000105611D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Apel, A: AUTHOR [+2]

Abstract

This system is to be used to automatically position a video camera to follow motion and to adjust the focal length of the camera lens such that the motion detected occupies a specific portion of the video image. The system consists of a video camera or camcorder mounted on an electric pan/tilt head, and a remote control zoom lens, and an image digitizing circuit, and a set of computer controlled switches which can control the pan/tilt head and the zoom lens focal length. The image digitizing circuit should be programmable to sample and measure specific regions of the total image area. Typical of such devices is the Tecmar PC-Mate Video Van Gogh* digitizing board. A typical electric pan/tilt head is the MVH-2D manufactured by Daiwa, Japan.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Motion Following Apparatus

      This system is to be used to automatically position a video
camera to follow motion and to adjust the focal length of the camera
lens such that the motion detected occupies a specific portion of the
video image.  The system consists of a video camera or camcorder
mounted on an electric pan/tilt head, and a remote control zoom lens,
and an image digitizing circuit, and a set of computer controlled
switches which can control the pan/tilt head and the zoom lens focal
length.  The image digitizing circuit should be programmable to
sample and measure specific regions of the total image area.  Typical
of such devices is the Tecmar PC-Mate Video Van Gogh* digitizing
board.  A typical electric pan/tilt head is the MVH-2D manufactured
by Daiwa, Japan.  All these components can be used with a personal
computer or the programming functions to be described can be embodied
in a dedicated device.

      The above figure shows the overall image, M, which is viewed by
the video camera.  The equal area regions A, B, C, D, E, F, G, and H
are continually measured by the video digitizing circuit.  The
absolute change in image intensity of each region is calculated and
stored over short periods of time, typically over one half of a
second.

      The changes in image intensity in the various measured regions
can be compared to determine how the remote control pan/tilt head and
the zoom lens should be adjusted.  The logic of control is as
follows:

      If the momentary sum of changes in regions A and B are greater
than the momentary changes in regions C and D then the video camera
should be moved slightly higher to turn into the motion detected.  If
the opposite is true then...