Pull-down detection apparatus and pull-down detection method
AssigneeNEC Electronics Corporation
InventorKazuhiro Fuji
Life of this patent
Estimating the term…
Abstract
A pull-down detection apparatus includes a pixel comparator at least performing pixel comparison between a subsequent field and a present field to determine a presence of a pixel change between the subsequent field and the present field, a field comparator compiles a determination result in the pixel comparator by dividing the result according to pixel location in the fields and determining a presence of an image change between the subsequent field and the present field based on the divided compiled determination result, and a pull-down determinater determining that the input video signal is generated by pull-down processing based on a history of a determination result in the field comparator.
Claims14
A pull-down detection apparatus for detecting that an input video signal is 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 by dividing the result according to pixel location in the fields and determining a presence of an image change between the first field and the second field based on the divided compiled determination result;
- and
- a pull-down determinater determining that the input video signal is generated by pull-down processing based on a history of a determination result in the field comparator.
A pull-down detection method for detecting that a video signal is 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;
- compiling determination results of a presence of a pixel change by dividing the results according to pixel location in the fields and determining a presence of an image change between the first field and the second field based on the divided and compiled determination result;
- and
- determining that the video signal is generated by pull-down processing based on a history of a determination result of a presence of an image change.
Dependencies are inferred from the claim text.