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US 7,612,829 B2Granted
2:2 and 3:2 pull-down detection techniques
AssigneeZoran Corporation
InventorWing-Chi Chow
Life of this patent
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Abstract
Improved 2:2 and 3:2 pull-down detection techniques are presented. These techniques can, for example, be used when converting an interlaced video signal into a progressive video signal. The improved techniques are less susceptible to bad edits. In one embodiment, comparison values are generated using consecutive fields of the interlaced video signal having the same parity, with a sequence of one small comparison value followed four large comparison values, where the four large comparison values include two pairs of similar large comparison values, is used to indicate a 3:2 pull-down.
Claims28
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising:
- determining in a pull-down detection circuit whether the interlaced video signal includes two or more characteristics;
- generating in the pull-down detection circuit a first signal that indicates a 2:2 sequence if the interlaced video signal includes a first characteristic;
- generating in the pull-down detection circuit a second signal that indicates a 2:2 sequence if the interlaced video signal includes a second characteristic;
- and
- generating in a deinterlacer circuit a progressive video signal from the interlaced video signal using a merging technique if the interlaced video signal includes the first characteristic and the second characteristic and the first and second signals indicate the same 2:2 sequence.
2 more elements
A method for determining whether an interlaced video signal was generated using 2:2 pull-down, the method comprising:
- determining in a pull-down detection circuit whether the interlaced video signal includes two or more characteristics;
- generating in the pull-down detection circuit a first signal that indicates a 2:2 sequence if the interlaced video signal includes a first characteristic;
- generating in the pull-down detection circuit a second signal that indicates a 2:2 sequence if the interlaced video signal includes a second characteristic;
- and
- generating in a deinterlacer circuit a progressive video signal from the interlaced video signal using a motion adaptive technique, a motion compensated technique, or an interpolation technique if the interlaced video signal does not include the first characteristic or the interlaced video signal does not include the second characteristic or if the first and second signals do not indicate the same 2:2 sequence.
2 more elements
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 operable to detect a 2:2 pull-down field pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down field pattern has been detected in the interlaced video signal, and generate a first signal indicating a 2:2 sequence if a 2:2 pull-down field pattern has been detected;
- a frame motion detector circuit coupled to receive the interlaced video signal and operable to detect a 2:2 pull-down frame pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down frame pattern has been detected in the interlaced video signal, generate a second signal indicating the 2:2 sequence if a 2:2 pull-down frame pattern has been detected;
- a control circuit coupled to receive the first signal from the field motion detector circuit and the second signal from the frame motion detector circuit;
- and
- a deinterlacer circuit coupled to receive a third signal from the control circuit, wherein the deinterlacer circuit uses a merging technique to generate a progressive video signal from the interlaced video signal if the third signal indicates that the interlaced video signal was generated using 2:2 pull-down.
2 more elements
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 operable to detect a 2:2 pull-down field pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down field pattern has been detected in the interlaced video signal, and generate a first signal indicating a 2:2 sequence if a 2:2 pull-down field pattern has been detected;
- a frame motion detector circuit coupled to receive the interlaced video signal and operable to detect a 2:2 pull-down frame pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down frame pattern has been detected in the interlaced video signal, generate a second signal indicating the 2:2 sequence if a 2:2 pull-down frame pattern has been detected;
- and
- a deinterlacer circuit coupled to receive the first signal from the field motion detector circuit and the second signal from the frame motion detector circuit, wherein the deinterlacer circuit uses a merging technique to generate a progressive video signal from the interlaced video signal if the first signal and the second signal indicate that the interlaced video signal was generated using 2:2 pull-down.
1 more element
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 operable to detect a 2:2 pull-down field pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down field pattern has been detected in the interlaced video signal, and generate a first signal indicating a 2:2 sequence if a 2:2 pull-down field pattern has been detected;
- a frame motion detector circuit coupled to receive the interlaced video signal and operable to detect a 2:2 pull-down frame pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down frame pattern has been detected in the interlaced video signal, generate a second signal indicating the 2:2 sequence if a 2:2 pull-down frame pattern has been detected;
- a control circuit coupled to receive the first signal from the field motion detector circuit and the second signal from the frame motion detector circuit;
- and
- a deinterlacer circuit coupled to receive a third signal from the control circuit, wherein the deinterlacer circuit uses a motion adaptive technique, a motion compensated technique, or an interpolation technique to generate a progressive video signal from the interlaced video signal if the third signal does not indicate that the interlaced video signal was generated using 2:2 pull-down.
2 more elements
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 operable to detect a 2:2 pull-down field pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down field pattern has been detected in the interlaced video signal, and generate a first signal indicating a 2:2 sequence if a 2:2 pull-down field pattern has been detected;
- a frame motion detector circuit coupled to receive the interlaced video signal and operable to detect a 2:2 pull-down frame pattern in the interlaced video signal, generate a signal indicating whether a 2:2 pull-down frame pattern has been detected in the interlaced video signal, generate a second signal indicating the 2:2 sequence if a 2:2 pull-down frame pattern has been detected;
- and
- a deinterlacer circuit coupled to receive the first signal from the field motion detector circuit and the second signal from the frame motion detector circuit, wherein the deinterlacer circuit uses a motion adaptive technique, a motion compensated technique, or an interpolation technique to generate a progressive video signal from the interlaced video signal if the first signal does not indicate that the interlaced video signal was generated using 2:2 pull-down or the second signal does not indicate that the interlaced video signal was generated using 2:2 pull-down.
1 more element
Dependencies are inferred from the claim text.