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US 7,599,095 B2Granted
Wavelet-based image processing path
AssigneeRicoh Company, Ltd.
InventorsKathrin Berkner, Edward L. Schwartz, Michael J. Gormish
Life of this patent
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Abstract
A system is described. In one embodiment, the system comprises an image processing path and a print engine coupled to the image processing path. The image processing path processes an input image in a wavelet domain.
Claims72
A system comprising:
- a wavelet-based image processing path to enhance an input image in a wavelet domain, wherein the processing path includes a unit to sharpen or smooth text and image regions of the image data corresponding to the input image, wherein the unit is operable to perform denoising by thresholding coefficients generated from the application of a forward wavelet transform to generate denoised coefficients, and rescale the denoised coefficients with a level-dependent parameter to sharpen or smooth the denoised coefficients.
A method comprising:
- processing an input image by enhancing the input image, including applying a forward wavelet transform to create a plurality of coefficients and filtering coefficients with a coefficient domain operator in a wavelet domain, including sharpening or smoothing text and image data in the wavelet domain corresponding to the input image, wherein the sharpening or smoothing is accomplished by performing denoising by thresholding coefficients generated by applying the forward wavelet transform to generate denoised coefficients, and rescaling the denoised coefficients with a level-dependent parameter to sharpen or smooth the denoised coefficients.
A method comprising:
- applying, using a processor, a forward wavelet transform to image data;
- performing denoising, based on a classification of coefficient regions of the image data, by thresholding coefficients generated by applying the forward wavelet transform;
- and
- rescaling coefficients by filtering coefficients after thresholding, wherein rescaling coefficients comprises performing sharpening or smoothing by multiplying coefficients with a level dependent parameter.
1 more element
Dependencies are inferred from the claim text.