1. An apparatus comprising: an input for receiving a video signal comprising a first image and a second image wherein said second image is received after said first image; a processor operative to determine a first probable location of a first caption within a first image, analyze said first image to identify a first region of said first image comprising said probable location of said first caption, determine a second probable location of a second caption with a second image, analyze said second image to identify a second region of said second image comprising said probable location of said second caption, determine a spatial overlap between said first region and said second region, and generate a data representing said spatial overlap; a memory for storing data concerning the probable locations of said first caption wherein said data is stored in said memory and updated with the determination results of said second image, the data representing a two dimensional analysis of the spatial overlap and a temporal representation of the spatial overlap; and an output for coupling said data to a video processor.