×

Methods and apparatus for automatically identifying programs viewed or recorded

  • US 4,697,209 A
  • Filed: 04/26/1984
  • Issued: 09/29/1987
  • Est. Priority Date: 04/26/1984
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of identifying a signal received by an audience member'"'"'s television receiver for determining audience ratings comprising the steps of:

  • detecting the occurence of a first event in the functional operations of he audience namber'"'"'s televison receiver;

    detecting the occurence of a second event after the detected first event in the signal to be identified;

    extracting a signature from a single frame of the video signal to be identified after the occurrence of the second event;

    storing the signature and the time of occurence thereof; and

    comparing the stored signature with reference signatures that occurred at approximately the same time as the stored signature.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×