| US 7,586,541 B2 | ||
| Method and system for enhanced modulation of video signals | ||
| Christopher E. Chupp, St. Louis, Mo. (US); Michael S. Gramelspacher, St. Louis, Mo. (US); Jesse J. Chounard, II, Ballwin, Mo. (US); James G. Withers, Chesterfield, Mo. (US); Yousri H. Barsoum, St. Louis, Mo. (US); and Michael C. Reynolds, Ballwin, Mo. (US) | ||
| Assigned to Koplar Interactive Systems International, L.L.C., St. Louis, Mo. (US) | ||
| Filed on Mar. 31, 2005, as Appl. No. 11/95,334. | ||
| Application 11/095334 is a division of application No. 10/888919, filed on Jul. 09, 2004, granted, now 7,116,374. | ||
| Claims priority of provisional application 60/498039, filed on Aug. 26, 2003. | ||
| Claims priority of provisional application 60/502136, filed on Sep. 10, 2003. | ||
| Claims priority of provisional application 60/554151, filed on Mar. 18, 2004. | ||
| Prior Publication US 2005/0195327 A1, Sep. 08, 2005 | ||
| Int. Cl. H04N 7/084 (2006.01) | ||
| U.S. Cl. 348—473 | 16 Claims |
| 1. A method comprising:
reading a plurality of scan lines of a selected portion of a video signal into a signal matrix, the signal matrix having a
plurality of rows that correspond to the plurality of scan lines, a row of the plurality of rows having a plurality of positions
that correspond to the plurality of pixels;
obtaining a plurality of difference values by subtracting each of the plurality of positions on the plurality of rows with
a corresponding plurality of positions in a subsequent row of the selected portion;
adding a difference value of the plurality of difference values to a line accumulator when the difference value is below a
threshold value associated with the row;
incrementing an in-range line count for the row when the line accumulator is within a range for the selected portion; and
outputting a carrier absence for the selected portion when the in-range line count is less than or equal to an in-range threshold
or a carrier presence for the selected portion when the in-range line count is greater than the in-range threshold.
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