Localized content adaptive filter for low power scalable image processing
First Claim
1. A localized content adaptive filter system, comprising:
- a tile buffer having an output providing first image information;
a frequency analyzer, coupled to said tile buffer, providing a frequency information signal based on frequency content of said first image information;
an adaptive filter, coupled to said frequency analyzer, which is adjusted based on said frequency information signal; and
a sampler, coupled to said adaptive filter, wherein said adaptive filter and said sampler collectively modify spatial resolution of second image information.
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Abstract
A localized content adaptive filter system including a tile buffer having an output providing first image information, a frequency analyzer providing a frequency information signal based on frequency content of the first image information, and an adaptive filter which is adjusted based on the frequency information signal. The frequency analyzer may include a wavelet transform filter and a frequency content analyzer. The adaptive filter may include filter select logic which receives the frequency information signal and second image information associated with the first image information, and which provides filtered image information. The filter select logic determines a filter based on the frequency information signal and the determined filter filters the second image information to provide the filtered image information. The filter select logic may include preconfigured filters in which a filter is selected by the frequency information, or a programmable filter which is programmed according to the frequency information.
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Citations
24 Claims
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1. A localized content adaptive filter system, comprising:
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a tile buffer having an output providing first image information; a frequency analyzer, coupled to said tile buffer, providing a frequency information signal based on frequency content of said first image information; an adaptive filter, coupled to said frequency analyzer, which is adjusted based on said frequency information signal; and a sampler, coupled to said adaptive filter, wherein said adaptive filter and said sampler collectively modify spatial resolution of second image information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image processing system, comprising:
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an up sampler having an input receiving first image information at a first spatial layer and an output providing up sampled image information; and a first localized content adaptive filter, comprising; a first tile buffer which stores said first image information; a first wavelet transform filter having an input coupled to said first tile buffer and an output; a first frequency content analyzer having an input coupled to said output of said first wavelet transform filter and an output providing a first frequency information signal indicative of frequency content of said first image information; and first filter select logic having a first input receiving said first frequency information signal, a second input receiving said up sampled image information, and an output providing first filtered image information for a second spatial layer; wherein said first filter select logic determines a first filter based on said first frequency information signal and wherein said first filter filters said up sampled image information to provide said first filtered image information. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method of adaptively configuring a filter, comprising:
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localizing input image information; determining frequency content of the localized input image information; adjusting an adaptive filter based on the determined frequency content; and sampling and filtering the input image information using the adaptive filter to change spatial resolution of the input image information. - View Dependent Claims (22, 23, 24)
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Specification