Pull-down detection apparatus and pull-down detection method
AssigneeNEC Electronics Corporation
InventorKazuhiro Fuji
Life of this patent
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Abstract
A pull-down detection apparatus includes a pixel comparator at least performing pixel comparison between a subsequent field and a present field and horizontal pixel comparison in the subsequent field and the present field to determine a presence of a pixel change between the subsequent field and the present field, a field comparator determining a presence of an image change between the subsequent field and the present field based on a determination result in the pixel comparator, 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.
Claims24
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 horizontal pixel comparison in the first field and/or the second 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 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;
- measuring a difference in pixel horizontally in the first field and/or the second field and comparing the difference with a second 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 and the second threshold value;
- determining a presence of an image change between the first field and the second field based on a determination result of a presence of a pixel change;
- 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.
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 pixel comparison between the first field and a third field that is two-field before the first field to determine a presence of an 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 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;
- measuring a difference in pixel between the first field and a third field that is two-field before the first field and comparing the difference with a second threshold value;
- determining a presence of a pixel change between the first field and the second field based on a comparison result between the first threshold value and the second threshold value;
- compiling a determination result of a presence of a pixel change for one field and determining a presence of an image change between the first field and the second field based on a compiling 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.