US 2006/0187301 A1 · Pull-down detection apparatus and pull-down detection method

Abstract

A pull-down detection apparatus includes a pixel comparator at least performing pixel comparison between a subsequent field and a present field and determining a presence of a pixel change between the subsequent field and the present field, a field comparator compiling a determination result in the pixel comparator and determining a presence of an image change between the subsequent field and the present field based on the determination result in the pixel comparator, and a pull-down determinater determining if the input video signal is a pull-down signal based on a determination result in the field comparator. The pull-down determinater changes a condition for determining a difference in pixel in the pixel comparator and/or a condition for determining a change in image in the field comparator based on a history of determination if the input video signal is a pull-down signal.

Claims14

Dependent claims

A pull-down detection apparatus for detecting that an input video signal is a pull-down signal generated by pull-down processing, comprising:

a pixel comparator at least performing pixel comparison between a first field contained in the input video signal and a second field that is one-field before the first field and determining 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 if the input video signal is a pull-down signal based on a determination result in the field comparator,
wherein a condition for determining a presence of a pixel change in the pixel comparator and/or a condition for determining a presence of an image change in the field comparator are changed based on a history of determination if the input video signal is a pull-down signal.

2 more elements

A pull-down detection method for detecting that a video signal is a pull-down signal generated by pull-down processing, comprising:

measuring a difference in pixel between a first field contained in the video signal and a second field that is one-field before the first field and comparing the difference with a first threshold value;
determining a presence of a pixel change between the first field and the second field based on a comparison result with the first threshold value;
determining a presence of an image change between the first field and the second field based on the determination result of a presence of a pixel change;
determining if the input video signal is a pull-down signal based on the determination result in the presence of an image change;
and
changing a condition for determining a presence of a pixel change and/or a condition for determining a presence of an image change based on a history of determination if the input video signal is a pull-down signal.

3 more elements

Dependencies are inferred from the claim text.

Pull-down detection apparatus and pull-down detection method

Life of this patent

Pull-down detection apparatus and pull-down detection method

Life of this patent

Abstract

Claims14