Interframe noise reduction for video
AssigneeTexas Instruments Incorporated
InventorsKarl Renner, Shereef Shehata, Jason Meiners, Weider Chang
Life of this patent
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Abstract
A system to reduce noise includes a noise measurement device that provides a measure of noise associated with a digital input video signal. A noise reduction filter provides a noise-reduced digital output video signal corresponding to the luma and chroma of the digital input video signal. The noise reduction filter has a parameter that varies on a pixel basis for the component of the digital input video signal as a function of the measure of noise. The range and sensitivity of the noise reduction can be user programmable.
Claims20
A system to reduce noise comprising:
- a noise measurement device that provides a measure of noise associated with a digital input video signal;
- and
- a noise reduction filter that provides a noise-reduced digital output video signal corresponding to a component of the digital input video signal, the noise reduction filter having a parameter that varies on a pixel basis for the component of the digital input video signal as a function of the measure of noise.
A video noise reduction system, comprising:
- a separator that separates a digital input video signal into a luma component signal, a first chroma component signal and a second chroma component signal;
- a noise measurement device that provides a measure of noise associated with the digital input video signal;
- a luma noise reduction filter configured to recursively filter the luma component signal and provide a corresponding noise-reduced luma component signal, the luma noise reduction filter having noise reduction characteristics that adaptively vary according to a luma noise reduction filter parameter that is computed based on the measure of noise;
- a first chroma noise reduction filter configured to recursively filter the first chroma component signal and provide a corresponding noise-reduced first chroma component signal, the first chroma noise reduction filter having noise reduction characteristics that adaptively vary according to a first chroma noise reduction filter parameter that is computed based on the measure of noise;
- and
- a second chroma noise reduction filter configured to recursively filter the second chroma component signal and provide a corresponding noise-reduced second chroma component signal, the second chroma noise reduction filter having noise reduction characteristics that adaptively vary according to a second chroma noise reduction filter parameter that is computed based on the measure of noise.
A system to reduce noise in a digital input video signal, comprising:
- means for quantifying a level of noise in the digital input video signal;
- means for recursively filtering a digital input video signal component according to a filter parameter to provide a noise-reduced component output signal;
- and
- means for adaptively determining the noise reduction filter parameter based on the level of noise.
Dependencies are inferred from the claim text.