| 摘要 |
THE INVENTION CONCERNS A METHOD AND SYSTEM FOR IDENTIFYING COMMERCIAL MESSAGE SEGMENTS OF A VIDEO SIGNAL.A SET OF RULES IS APPLIED FOR DETERMINING THE OCCURRENCE OF COMMERCIAL MESSAGES WITH A HIGHER DEGREE OF ACCURACY AS COMPARED TO CONVENTIONAL METHODS. IN GENERAL, METHOD INCLUDES THE STEPS OF MONITORING A DIGITAL BIT STREAM COMPRISING THE VIDEO SIGNAL, DETECTING A CHANGE IN A CONTROL FIELD OF THE DIGITAL BIT STREAM (208),AND THEN SELECTIVELY GENERATING A COMMERCIAL EVENT NOTIFICATION (410) RESPONSIVE TO THE DETECTING STEP. ACCORDING TO ONE ASPECT OF THE INVENTION,A CHANGE IN AT LEAST ONE OF A VIDEO SEQUENCE HEADER AND A SEQUENCE DISPLAY EXTENSION CAN BE DETECTED. ALTERNATIVELY, OR IN ADDITION TO CHECKING FOR A CHANGE IN CONTROL FIELD, THE METHOD CAN COMPRISE THE STEP OF DETECTING A CHANGE IN AN INFORMATIONAL PARAMETER OF THE VIDEO SIGNAL EXCLUSIVE OF THE AUDIO-VISUAL CONTENT.
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