Autotracking device designating a target

• US 5,982,420 A
• Filed: 01/21/1997
• Issued: 11/09/1999
• Est. Priority Date: 01/21/1997
• Status: Expired due to Fees

• Current Assignee: Navy Department United States of America The As Represented By The Secretary of The Navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Ratz, Stephen G.
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): Voisinet, John A.
• Application Number:
  US08/790,825
• Time in Patent Office: 1,022 Days
• Field of Search: 348/143, 348/150, 348/151, 348/152, 348/153, 348/154, 348/155, 348/169, 348/170, 348/171, 348/172, 348/214, 244/3.16
• US Class Current: 348/171
• CPC Class Codes: G01S 3/7864 T.V. type tracking systems
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

An automatic tracking device is disclosed that extracts data from the comite video output signal of a camera and uses it to electronically isolate an object in the image information on the video output signal and follows the object with a crosshair added to the video by the autotracking device. The autotracking device generates steering signals that are applied to the camera directing circuits to cause the camera to automatically follow the object as the object moves.

Claims

1. An autotracking device for a video control system that produces composite video signals containing image signals and synchronization signals, said video control system having a display device with directing circuits responsive to steering signals for causing the movement of a camera of said video control system, said autotracking device comprising:

(a) means for receiving and normalizing said composite video signals to a predetermined level;

(b) means for extracting a preselected portion of the composite video signals so as to isolate object information thereof, said information of said preselected portion having a transition rate that exceeds a predetermined value;

(c) means for detecting said transitions of said preselected portion and separating one transition from another;

(d) means for comparing said separated transitions against a reference and generating a corresponding output signal when each of said transitions exceeds said reference;

(e) means for comparing the corresponding output signals against each other to determine the dominant transition therebetween;

(f) means for digitizing the dominant transition value into digital data serving as target data;

(g) means for extracting horizontal and vertical synchronizing signals from said normalized composite video signals;

(h) means for digitizing the extracted horizontal and vertical synchronizing signals;

(i) counter means having a preloaded quantity and responsive to said digitized horizontal and vertical synchronizing signals, said counter means being synchronized to said display device, said counter means providing a fixed pattern corresponding to said preloaded quantity, said fixed pattern being displayed in the central region of said display device; and

(j) processor means for receiving said target data and providing first and second sets of signals with the first set of signals being applied to said counter means to cause said target data to be displayed in correspondence with said fixed pattern and the second set of signals serving as said steering signals to cause said camera to track said object.

2. The autotracking device according to claim 1 further comprising an automatic gain control (AGC) circuit that holds said preselected portion of the normalized composite video signal at a predetermined level.

3. The autotracking device according to claim 1 further comprising means for minimizing step function gating noise from being interpreted as video transitions of said preselected portion of said normalized composite video signals.

4. The autotracking device according to claim 1, wherein said means for detecting said transition further comprises;

differentiating means for receiving said transitions of said preselected portion having rising and falling edges and providing positive and negative peaks corresponding to said rising and falling edges of said preselected portion.

5. The autotracking device according to claim 1, wherein said means for extracting horizontal and vertical synchronizing signals further comprises first filter means for filtering said normalized composite video signals.

6. The autotracking device according to claim 1, wherein said means for extracting horizontal and vertical synchronizing signals further comprises second filter means for filtering said normalized composite signal to remove said horizontal synchronizing signal therefrom resulting in said vertical synchronization signals.