System and method for multi-scale sigma filtering using quadrature mirror filters

A system for improving the quality of a digital image comprising:

• a first sigma filtering circuit to sigma filter an 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.

A system for improving the quality of a digital image comprising:

• a first sigma filtering circuit to sigma filter an 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 detailed part to produce a first reconstructed image;
• and
• a second synthesizer to synthesize the first reconstructed image and the first detail part to produce a final filtered image.