Patent ID: 7999876

Claim:
A pull-down detection apparatus for detecting that an input video signal is generated by a pull-down processing, the pull-down detection apparatus comprising: a pixel comparator performing at least a pixel comparison between a first field included in the input video signal and a second field that is one-field before the first field and a pixel comparison between the first field and a third field that is two-fields before the first field to determine a presence of a pixel change between the first field and the second field; a field comparator compiling a determination result in the pixel comparator and determining a presence of an image change between the first field and the second field based on the determination result in the pixel comparator; and a pull-down determinater determining that the input video signal is generated by the pull-down processing based on a history of a determination result in the field comparator, wherein the pixel comparator measures a difference in pixel value between a first pixel included in the first field and a third pixel included in the third field and located in the same coordinate as the first pixel and, when the difference is less than a predetermined threshold value, the pixel comparator excludes the first pixel from the determination of a presence of a pixel change.