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US 5,708,693 AGranted
Image processing for noise reduction
AssigneeU.S. Philips Corporation
InventorsTil Aach, Dietmar W. Kunz, Stefan H. E. Ludeke
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Abstract
An image processing method includes multi-resolution decomposition to decompose an input image into frequency-band images, which are subsequently filtered according to an order statistics filtering. Preferably, a finite impulse response median hybrid is employed. The filtered frequency-band images are synthesized to form the filtered output image.
Claims20
An image processing steps comprising the steps of:
- dividing an input image into several frequency-band images by means of a multi-resolution decomposition method,
- processing the separate frequency-band images to derive processed frequency-band images, the processing comprising filtering the frequency-band images to form filtered frequency-band images, and
- performing a multi-resolution synthesis method to said processed frequency-band images to form a filtered output image, characterized in that
- the filtering comprises an order statistics filtering.
1 more element
An image processor comprising:
- a decomposition unit for dividing an input image signal into several frequency-band image signals,
- a converter unit for processing the frequency-band image signals, the converter unit comprising a filter for filtering said frequency-band image signals to form processed frequency-band image signals, and
- a synthesizer for forming an filtered output image signal from said processed frequency-band image signals,
- characterized in that the filter comprises an order statistics filter.
1 more element
Dependencies are inferred from the claim text.