Method conducting smoothing processing in a linear direction hav

Details Method conducting smoothing processing in a linear direction hav Method conducting smoothing processing in a linear direction hav

1994-06-10

1996-10-01

Boudreau, Leo

Image analysis

Image enhancement or restoration

Image filter

382275, G06K 944

Patent

active

055617247

ABSTRACT:
A noise filtering method including the steps of calculating a magnitude E.sub.i of density change for each of a plurality of linear direction components i in a local region around each of pixels of an inputted two-dimensional image, detecting such a direction as to minimize the magnitude E.sub.i of density change, conducting smoothing processing by deriving an arithmetic mean of densities of pixels in the local region arranged in the detected direction, and thereby reducing noise of the inputted image.

REFERENCES:
patent: 5390264 (1995-02-01), Ishihara et al.
patent: 5408338 (1995-04-01), Koike
Harashima et al., "E-Separating Nonlinear Digital Filter and Its Applications," Trans. of the Inst of Electr. and Comm. Engs. of Japan, vol. J65-A, No. 4, Apr. 1982, pp. 297-304.
Perona et al., "Scale-Space and Edge Detection Using Anistropic Diffusion," IEEE Trans. on Pattern Analysis and Machine Intell., vol. 12, No. 7, Jul. 1990, pp. 629-639.
Lee, "Digital Image Enhancement and Noise Filtering by Use of Local Statistics,"IEEE Trans. on Pattern Analysis and Machine Intell ; vol. PAMI-2, No. 2, Mar. 1980, pp. 165-168.
Toriwaki, "Digital Image Processing for Image Understanding," Shoko-do, Nov. 30, 1989, pp. 112-114.
Mallat, "A Theory for Multiresolution Signal Decomposition: The Wavelet Representation," IEEE Trans. on Pattern Analysis and Machine Intell., vol. 11, No. 7, Jul. 1989, pp. 674-693.
Daubechies, "Orthonormal Bases of Compactly Supported Wavelets," Commun. Pure Appl. Math., vol. XLI, Nov. 1988, pp. 909-996.
English Translation of Japanese Kokai 4-188283, Mita, Jul. 1992.

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