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    • 6. 发明专利
    • DE602005008427D1
    • 2008-09-04
    • DE602005008427
    • 2005-05-04
    • KONINKL PHILIPS ELECTRONICS NV
    • VAN LEEST ADRIAAN JLANGELAAR GERRIT C
    • G06T1/00
    • There is described a method of determining a measure of scale factor (MSF) by detecting a watermark included in a sequence ( 10 ) of images ( 20 ). The watermark is included in several mutually changed forms in the sequence ( 10 ). In a first step, the method involves receiving the sequence ( 10 ) of images ( 20 ). In a second step, the images ( 2 ) are sorted substantially into a plurality of corresponding groups depending upon one or more relative changes applied to their included watermarks. In a third step, the method involves accumulating for each group at least a portion of one or more images thereof into corresponding buffers. In a fourth step, the method involves mutually analyzing contents of the buffers ( 130, 180 ) to determine one or more changes applied to the watermark included in the sequence ( 10 ). In a fifth step, information concerning the one or more changes is processed in relation to an expected scale factor to determine said measure of scale factor (MSF).