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US 7,068,851 B1Granted
Multiscale sharpening and smoothing with wavelets
AssigneeRicoh Company, Ltd.
InventorKathrin Berkner
Life of this patent
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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.
Claims76
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;
- 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, wherein each of the different scale dependent parameters is determined according to the following formula:
- μj=2jα
- where the value of α indicates whether sharpening or smoothing is applied to coefficients and j indicates the scale.
2 more elements
A method for processing input data that comprises image data, the method comprising:
- decomposing the input data into a plurality of decomposition levels by applying a wavelet transform to the input 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;
- performing renormalization on coefficients;
- and
- inverse transforming the coefficients, wherein each of the different scale dependent parameters is determined according to the following formula:
- μj=2jα
- where the value of α indicates whether sharpening or smoothing is applied to coefficients and j indicates the particular scale.
5 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;
- 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, wherein each of the different scale dependent parameters is determined according to the following formula:
- μj=2jα
- where the value of α indicates whether sharpening or smoothing is applied to coefficients, and j indicates a particular scale.
2 more elements
An article of manufacture having one or more recordable media 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;
- 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, wherein each of the different scale dependent parameters is determined according to the following formula:
- μj=2jα
- where the value of α indicates whether sharpening or smoothing is applied to coefficients and j indicates a particular scale.
2 more elements
An apparatus for processing input data comprising:
- a forward wavelet filter to convert the input data into coefficients in a plurality of decomposition levels;
- 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;
- and
- an inverse wavelet filter coupled to the scaling unit, wherein each of the different scale dependent parameters is determined according to the following formula:
- μj=2jα
- where the value of α indicates whether sharpening or smoothing is applied to coefficients and j indicates a particular scale.
3 more elements
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 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,
- an inverse wavelet filter coupled to the scaling unit;
- and
- a printer coupled to the scaling unit, wherein each of the different scale dependent parameters is determined according to the following formula:
- μj=2jα
- where the value of α indicates whether sharpening or smoothing is applied to coefficients and j indicates a particular scale.
7 more elements
Dependencies are inferred from the claim text.