| 摘要 |
PROBLEM TO BE SOLVED: To speed up thedetection/non-detection of a 24-frame source included in a 60-frame interlace signal. SOLUTION: The 24-frame signal detection circuit includes: a field correlation detection circuit 10 for outputting an inter-field difference discrimination value C indicating "1" only once and "0" four times per five consecutive fields when the 60-frame interlace signal includes the 24-frame source; a 24-frame detecting circuit 20 for summating the inter-field difference discrimination value C obtained by the field correlation detection circuit 10 by five consecutive fields and outputting a 24-frame detection signal D denoting that the summated signal indicates "1"; an integration discrimination circuit 40 that subtracts a sum resulting from applying a prescribed weight to "0s" of the 24-frame detection signals D from the sum of "1s" of the 24-frame detection signals D and setting "1" to a 24-frame discrimination signal E when the result of subtraction exceeds a prescribed value; and a scene switching detection circuit 30 for bringing "0" to the 24-frame discrimination signal E when a scene of the video image is subject to change. COPYRIGHT: (C)2006,JPO&NCIPI
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