Video signal content indexing and linking to information sources

1. A method for generating an overlay directory for a video signal, the method comprising employing a computer having stored thereon computer-executable instructions for:

displaying static images of candidate objects on a screen;

assigning for each of said static images a respective index with an initial value;

initializing an interruption period;

producing a display of said video signal on said screen;

in response to pointing to both a position within each of selected appearances of an object image in said display and a respective static image:

entering information relevant to said object image in a specific section of said overlay directory provided that a particular index corresponding to said respective static image equals said initial value;

determining, for each appearance of said object image, a pointing time based on said interruption period and a current time indication at which said computer detects said pointing;

interrupting said display;

determining respective coordinates of a spatial contour overlapping said object image;

entering said pointing time and respective coordinates in said specific section;

updating said particular index;

resuming said display; and

increasing said interruption period by a time gap between said interrupting and said resuming.

2. The method of claim 1 further comprising a step of selecting said spatial contour from a set of standardized contours.

3. The method of claim 2 wherein said spatial contour encircles said image.

4. The method of claim 2 wherein said spatial contour has a predetermined size independent of a size of said image.

5. The method of claim 2 wherein said spatial contour is of a rectangular shape and said coordinates of said spatial contour comprise coordinates of two diagonal points defining said rectangular shape.

6. The method of claim 1 further comprising steps of:

acquiring a global object directory from a video-overlay server; and

verifying that said candidate objects belong to said global object directory.

7. The method of claim 1 further comprising using interpolation to determine a spatial contour between two selected appearances of a moving object image.

8. The method of claim 1 further comprising sending said overlay directory to a video-overlay server for distribution to at least one viewing computer.

9. A method for generating an overlay directory for a video signal, the method comprising employing a computer having stored thereon computer-executable instructions for:

displaying, on a screen, static images, each identifying an object from a set of designated objects;

initializing tracking records having a one-to-one correspondence to said designated objects;

initializing a cumulative interruption period;

producing a display of said video signal on said screen;

in response to a user of said computer pointing to both a position within each of selected appearances of an object image and a corresponding static image:

interrupting said display;

determining, for each appearance of said object image:

a pointing time derived from said cumulative interruption period and a current time indication of said computer; and

an enclosing contour for said each image;

adding said pointing time and said enclosing contour to a tracking record corresponding to said each image;

resuming said display; and

updating said cumulative interruption period, accounting for a time gap between said interrupting and said resuming;

and

displaying contents of said tracking records, and for each tracking record having at least one entry:

acquiring further information relevant to a designated object of said each tracking record; and

inserting said each tracking record and said further information in a section of said overlay directory corresponding to said designated object.

10. The method of claim 9 further comprising:

determining a frame number of said video signal corresponding to said pointing time, said video signal being organized into frames; and

inserting said frame number to a respective tracking record to facilitate identifying a respective object image in a replay of said signal.

11. The method of claim 9 further comprising:

acquiring a global object directory from a video-overlay server; and

extracting said set of designated objects from said global object directory according to instructions of said user of said computer.

12. The method of claim 9 further comprising linking said computer to a search engine to acquire said further information.

13. The method of claim 9 further comprising:

acquiring network addresses of servers providing information on a designated object corresponding to said object identifier;

retrieving said relevant information from said servers; and

annotating said relevant information by said user of said computer.

14. A system for generating an overlay directory for a video signal, the system comprising a plurality of computers each computer having a memory device storing computer-executable instructions which cause said each computer to:

display static images of candidate objects;

assign for each of said static images a respective index with an initial value;

initialize an interruption period;

producing a display of said video signal on a screen;

in response to pointing to both a position within each of selected appearances of an object image in said display and a respective static image:

enter information relevant to said object image in a specific section of said overlay directory provided that a particular index corresponding to said respective static image equals said initial value;

determine, for each appearance of said object image, a pointing time based on said interruption period and a current time at which said each computer detects said pointing;

interrupt said display;

determine respective coordinates of a spatial contour overlapping said object image;

enter said pointing time and said respective coordinates in said specific section;

update said particular index;

resume said display at a subsequent time; and

increase said interruption period according to said current time and said subsequent time.

15. The system of claim 14 further comprising a video-overlay server accessed by said each computer and containing:

said computer-executable instructions;

a global object directory including object information;

video-source directory containing network addresses of video sources;

a set of standardized spatial contours; and

a video-content directory.

16. The system of claim 15 wherein said each computer accesses said video-overlay server to:

acquire a network address of said video signal;

acquire said information relevant to said object image;

acquire a standardized contour; and

add said overlay directory to said video-content directory.

17. The system of claim 14 wherein said computer-executable instructions further cause said each computer to include in said overlay directory information provided by a user of said computer, said information comprising:

a description of an object represented by said object image; and

a list of network addresses of sites providing further information on said object.

18. A system for generating overlay directories for a plurality of video signals, the system comprising a plurality of computers each computer having a memory device storing computer-executable instructions which cause said each computer to:

acquire a video signal;

display, on a screen, static images, each identifying an object from among a set of designated objects;

initialize tracking records having a one-to-one correspondence to said designated objects;

initialize a cumulative interruption period;

produce a display of said video signal on said screen;

in response to a user of said computer pointing to both a position within each of selected appearances of an object image and a corresponding static image:

interrupt said display;

determine, for each appearance of said object image:

a pointing time derived from said cumulative interruption period and a current time of said computer; and

an enclosing contour for said each image;

add said pointing time and said enclosing contour to a tracking record corresponding to said each image;

resume said display at a subsequent time; and

update said cumulative interruption period according to said current time and said subsequent time;

and

display contents of said tracking records and for each tracking record having at least one entry:

acquire further information relevant to a designated object of said each tracking record; and

insert said each tracking record and said further information in a section of said overlay directory corresponding to said designated object.

19. The system of claim 18 wherein said computer-executable instructions further cause said each computer to:

determine a frame number of said video signal corresponding to said pointing time, said video signal being organized into frames; and

insert said frame number to a respective tracking record to facilitate identifying a respective object image in a replay of said signal.

20. The system of claim 18 wherein said computer-executable instructions further cause said each computer to:

acquire a global object directory from a video-overlay server; and

extract said set of designated objects from said global object directory according to instructions of said user of said computer.