System and method for multi-scale sigma filtering using quadrature mirror filters
First Claim
1. A method for improving the quality of a digital image comprising:
- (a) obtaining a digital image;
(b) sigma filtering the digital image to produce a sigma filtered input image;
(c) analysis processing the sigma filtered input image to produce an approximation part and a detail part;
(d) sigma filtering the approximation part to produce a sigma filtered approximation part; and
(e) synthesizing the sigma filtered approximation part and the detail part to generate a reconstructed filtered image.
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Abstract
A first sigma filtering circuit sigma filters an image to produce a filtered image. An analysis circuit processes the sigma filtered image to produce an approximation part and a detail part. A second sigma filter circuit filters the approximation part to produce a sigma filtered approximation part. Another analysis circuit process the sigma filtered approximation part to produce a second approximation part and a second detail part. A third sigma filter circuit sigma filters the second approximation part to produce a sigma filtered second filtered approximation part. A first synthesizer synthesizes the sigma filtered second filtered approximation part and the second detailed part to produce a first reconstructed image, and a second synthesizer synthesizes the first reconstructed image and the first detail part to produce a final filtered image.
44 Citations
20 Claims
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1. A method for improving the quality of a digital image comprising:
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(a) obtaining a digital image; (b) sigma filtering the digital image to produce a sigma filtered input image; (c) analysis processing the sigma filtered input image to produce an approximation part and a detail part; (d) sigma filtering the approximation part to produce a sigma filtered approximation part; and (e) synthesizing the sigma filtered approximation part and the detail part to generate a reconstructed filtered image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for improving the quality of a digital image comprising:
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a first sigma filtering circuit to sigma filter digital image to produce a sigma filtered image; an analysis circuit to process the sigma filtered image to produce an approximation part and a detail part; a second sigma filter circuit to filter the approximation part to produce a sigma filtered approximation part; and a synthesizer to combine the sigma filtered approximation part and the detail part to generate a reconstructed filtered image. - View Dependent Claims (9, 10, 11, 12)
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13. A system for improving the quality of a digital image comprising:
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a first sigma filtering circuit to sigma filter a digital image to produce a sigma filtered image; a first analysis circuit to process the sigma filtered image to produce an approximation part and a detail part; a second sigma filter circuit to filter the approximation part to produce a sigma filtered approximation part; a second analysis circuit to process the sigma filtered approximation part to produce a second approximation part and a second detail part; a third sigma filter circuit to sigma filter the second approximation part to produce a sigma filtered second approximation part; a first synthesizer to synthesize the sigma filtered second approximation part and the second detail part to produce a first reconstructed image; and a second synthesizer to synthesize the first reconstructed image and the detail part to produce a final filtered image. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification