Patent ID: 7050088

Claim:
A method for a 3:2 pull-down film source detection, comprising the steps of: receiving a source; calculating field differences FieldDiff of two fields F(n) and F(n+2) of the same type in the source; comparing the FieldDiff to a threshold Fi_th and an adaptive threshold Adap_th; calculating an average field difference aveDiff according to the field difference FieldDiff and the Adap_th corresponding to at least one prior field in the source; obtaining the Adap_th from multiplying the aveDiff and a coefficient K if the FieldDiff is not smaller than the Fi_th or Adap_th; and determining if the source is a 3:2 pull-down film source by checking whether a 3:2 pull-down signature is in the source according to the Fi_th and Adap_th.