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US 7,599,570 B2Granted
Multiscale sharpening and smoothing with wavelets
AssigneeRicoh Company, Ltd.
InventorKathrin Berkner
Life of this patent
Estimating the term…
Abstract
A method and apparatus for processing image data are described. In one embodiment, a method of processing image data comprises decomposing the image data into multiple decomposition levels by applying a wavelet transform to the image data, and modifying coefficients in at least two of the decomposition levels by scaling coefficients in theses decomposition levels using different scale dependent parameters for each of the decomposition levels.
Claims21
A method for processing input data comprising:
- decomposing the input data into a plurality of decomposition levels by applying a wavelet transform to the input data, wherein the input data comprises image data;
- and
- modifying coefficients in at least two of the plurality of decomposition levels, by scaling coefficients in the at least two decomposition levels using different scale dependent parameters for each of the decomposition levels, to smooth coefficients for scale dependent parameters greater than a transition value and sharpen coefficients for scale dependent parameters less than the transition value.
A method for processing input data comprising
- decomposing the input data into a plurality of decomposition levels by applying a wavelet transform to the input data, wherein the input data comprises image data;
- performing denoising on coefficients in at least one of the plurality of decomposition levels
- modifying coefficients in at least two of the plurality of decomposition levels, by scaling coefficients in at least two decomposition levels using different scale dependent parameters for each of the decomposition levels, to smooth coefficients for scale dependent parameters greater than a transition value and sharpen coefficients for scale dependent parameters less than the transition value;
- performing renormalization on coefficients;
- inverse transforming the coefficients.
2 more elements
An apparatus for processing input data comprising
- means for decomposing the input data into a plurality of decomposition levels by applying a wavelet transform to the input data, wherein the input data comprises image data;
- and
- means for modifying coefficients in at least two of the plurality of decomposition levels, by scaling coefficients in the at least two decomposition levels using different scale dependent parameters for each of the decomposition levels, to smooth coefficients for scale dependent parameters greater than a transition value and sharpen of coefficients for scale dependent parameters less than the transition value.
An article of manufacture having one or more computer readable medium storing executable instructions thereon which, when executed by one or more processing devices, cause the one or more processing devices to:
- decompose input data into a plurality of decomposition levels by applying a wavelet transform to the input data, wherein the input data comprises image data;
- and
- modify coefficients in at least two of the plurality of decomposition levels, by scaling coefficients in the at least two decomposition levels using different scale dependent parameters for each of the decomposition levels, to smooth coefficients for scale dependent parameters greater than a transition value and sharpen coefficients for scale dependent parameters less than the transition value.
An apparatus for processing input data comprising
- a forward wavelet filter to convert the input data into coefficients in a plurality of decomposition levels, wherein the input data comprises image data;
- a scaling unit to modifying coefficients in at least two of the plurality of decomposition Levels, by scaling coefficients in the at least two decomposition levels using different scale dependent parameters for each of the decomposition levels, to smooth coefficients for scale dependent parameters greater than a transition value and sharpen coefficients for scale dependent parameters less than the transition value;
- and
- an inverse wavelet filter coupled to the scaling unit.
1 more element
A copier comprising
- an image source
- a classifier unit coupled to the image source;
- a scaling unit coupled to the classifier unit comprising
- a forward wavelet filter to convert the image data into coefficients in a plurality of decomposition levels,
- a scaling unit to modify coefficients in at least two of the plurality of decomposition levels, by scaling coefficients in the at least two decomposition levels using different scale dependent parameters for each of the decomposition levels, to smooth coefficients for scale dependent parameters greater than a transition value and sharpen coefficients for scale dependent parameters less than the transition value,
- an inverse wavelet filter coupled to the scaling unit;
- and
- a printer coupled to the scaling unit.
5 more elements
Dependencies are inferred from the claim text.