2:2 and 3:2 pull-down detection techniques
AssigneeZoran Corporation
InventorWing-Chi Chow
Life of this patent
Estimating the term…
Abstract
The present disclosure describes improved 2:2 and 3:2 pull-down detection techniques. The techniques of the present invention can, for example, be used when converting an interlaced video signal into a progressive video signal.
Claims114
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising determining whether the interlaced video signal includes two or more characteristics.
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising:
- determining whether the interlaced video signal includes a 2:2 pull-down field pattern;
- and
- determining whether the interlaced video signal includes a 2:2 pull-down frame pattern.
A system for determining whether the interlaced video signal was generated using 2:2 pull-down, the circuit comprising:
- a field motion detector circuit coupled to receive an interlaced video signal;
- and
- a frame motion detector circuit coupled to receive the interlaced video signal.
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising:
- generating comparison values using consecutive fields of an interlaced video signal having the same parity;
- generating difference values using consecutive comparison values;
- and
- detecting a sequence of one small difference value followed by one large difference value.
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising:
- generating comparison values using consecutive fields of an interlaced video signal having the same parity;
- generating difference values using consecutive comparison values;
- and
- determining whether every other difference value is a small difference value.
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising:
- detecting an initial sequence of one small difference value followed by one large difference value;
- and
- if the initial sequence is detected, detecting whether every other difference value is a small difference value.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising determining whether the interlaced video signal includes two or more characteristics.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising:
- generating comparison values using consecutive fields of the interlaced video signal having the same parity;
- and
- detecting a sequence of one small comparison value followed by two pairs of similar large comparison values.
A system for determining whether an interlaced video signal was generated using 3:2 pull-down, the circuit comprising a 3:2 pull-down frame motion detector circuit, wherein the 3:2 pull-down frame motion detector circuit is operable to generate comparison values using consecutive fields of the interlaced video signal having the same parity and is operable to detect a sequence of one small comparison value followed by two pairs of similar large comparison values.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising:
- generating comparison values using successive even fields of the interlaced video signal and successive odd fields of the interlaced video signal;
- and
- determining whether the comparison values include a repeating pattern of one small comparison value followed by a pair of similar large comparison values and then another pair of similar large comparison values.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising:
- detecting an initial sequence of one small comparison value followed by a pair of similar large comparison values and then another pair of similar large comparison values;
- and
- if the initial sequence is detected, detecting a sequence of one small comparison value followed by a pair of similar comparison values and then another pair of similar comparison values.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising:
- generating comparison values using consecutive fields of the interlaced video signal having the same parity;
- and
- detecting a sequence of one small comparison value followed by a pair of similar large comparison values and then a pair of dissimilar large comparison values.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising:
- generating comparison values using consecutive fields of the interlaced video signal having the same parity;
- and
- detecting a sequence of one small comparison value followed by a pair of dissimilar large comparison values and then a pair of similar large comparison values.
A method for determining whether an interlaced video signal was generated using 3:2 pull-down, the method comprising:
- generating comparison values using consecutive fields of the interlaced video signal having different parities;
- and
- detecting a sequence of a pair of small comparison values, a don't care comparison value, a small comparison value, and a don't care comparison value.
Dependencies are inferred from the claim text.