Digital image noise reduction of luminance and chrominance based on overlapping planar approximation
October 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesNoise cleaner for binary images Character reading device Digital image correction Image data processing method and device therefor Unsharp masking for image enhancement Image signal filtering Method of smoothing image signals Binarizing apparatus Method and apparatus for recognizing pattern of gray level image System and method for reducing digital image noise Patent #: 5091972 InventorsApplicationNo. 781467 filed on 10/23/1991US Classes:382/266, Edge or contour enhancement358/463, Noise elimination382/275Artifact removal or suppression (e.g., distortion correction)ExaminersPrimary: Boudreau, Leo H.Assistant: Johns, Andrew W. Attorney, Agent or FirmInternational ClassG06K 009/40AbstractThe present invention reduces noise in digital photographic images based on the assumption that images may be decomposed into two types of regions, smooth regions and edge regions. Smooth regions are areas of the image lacking any sharp detail, such as blue sky. Edge regions are regions containing sharp detail, such as edges and textured regions (such as grass). The present method reduces noise in the smooth regions by a mathematical blurring technique based on least squares regression. The blurring does not degrade the sharpness of the image, because there are no sharp details in the smooth regions. Edge regions are left undisturbed to maintain sharpness, but the noise is less noticeable in those regions than in the smooth regions. The method operates upon the luminance and chrominance component of a digital image.Other References
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