11. The method according to claim 1 , wherein: the step of constructing the respective second lattice(s) includes determining a parameter of each respective second lattice using a lexicon having one or more lexicon parameter(s); the determining step includes determining a discrimination score for the video using at least one of the aggregate score(s); and the method further includes adjusting one or more of the lexicon parameter(s) using the determined discrimination score and repeating the constructing-second-lattice, constructing-aggregate-lattice, and determining steps using the lexicon having the adjusted parameter(s).
11. The method according to claim 1 , wherein: the step of constructing the respective second lattice(s) includes determining a parameter of each respective second lattice using a lexicon having one or more lexicon parameter(s); the determining step includes determining a discrimination score for the video using at least one of the aggregate score(s); and the method further includes adjusting one or more of the lexicon parameter(s) using the determined discrimination score and repeating the constructing-second-lattice, constructing-aggregate-lattice, and determining steps using the lexicon having the adjusted parameter(s). 13. The method according to claim 11 , further including repeating the detecting, constructing-first-lattice(s), constructing-second-lattice(s), constructing-aggregate-lattice, and determining steps for each of a plurality of videos and respective textual queries, wherein the adjusting-parameters step includes forming a composite score from the discrimination scores determined for each of the videos and adjusting the one or more of the lexicon parameter(s) based on the composite score.