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US 2009/0153732 A1Published application
Method and apparatus for adaptive selection of yc separation
AssigneeRealtek Semiconductor Corp.
InventorHsin Chieh TU
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Abstract
A method for adaptive selection of YC separation is provided. While a video decoder is re-sampling, a frequency of a re-sampling signal and a pixel rate of an output signal have a fixed relation, which is used to determine if a sampling frequency of the signal is deviated. And, accordingly, an appropriate Y/C separation is selected and then performed to obtain a better image quality.
Claims24
A method for YC separation, comprising:
- obtaining a first frequency value according to a subcarrier frequency of a chrominance signal of an image signal;
- obtaining a second frequency value according to a synchronizing signal of the image signal;
- generating a ratio value according to the first frequency value and the second frequency value;
- determining whether a sampling frequency of the image signal is deviated in order to generate a resultant signal in accordance with the ratio value;
- and
- performing a YC separation on the image signal according to the resultant signal.
3 more elements
A YC separator, comprising:
- a first clock generator for generating a first frequency value according to a subcarrier frequency of a chrominance signal of an image signal, wherein the first frequency value is related to the subcarrier frequency;
- a second clock generator for generating a second frequency value according to a synchronizing signal of the image signal, wherein the second frequency value is related to the frequency of the synchronizing signal;
- a detecting module for generating a control signal after determining whether a sampling frequency value of the image signal is deviated according to the first frequency value and the second frequency value;
- and
- a YC separation circuit for performing a YC separation on the image signal, wherein the inter-frame YC-separation of the YC separation circuit is disabled if the control signal is at a first state and the inter-frame YC-separation of the YC separation circuit is enabled if the control signal is at a second state.
2 more elements
A YC separator, comprising:
- a first re-sampling circuit for re-sampling a digital image signal according to a first clock and generating a re-sampling signal;
- a YC separation circuit for performing a YC separation on the re-sampling signal according to a control signal and generating a Y signal and a C signal, wherein an inter-frame YC-separation of the YC separation circuit is disabled if the control signal is at a first state and the inter-frame YC-separation of the YC separation circuit is enabled if the control signal is at a second state.
- a second re-sampling circuit for re-sampling the Y signal and the C signal according to a second clock and generating an output signal;
- and
- a detecting module for generating the control signal after determining whether a sampling frequency value of the digital image signal is deviated according to the re-sampling signal and the output signal.
2 more elements
Dependencies are inferred from the claim text.