Method of noise detection and noise apparatus

Details Method of noise detection and noise apparatus Method of noise detection and noise apparatus

1992-09-15

1994-10-11

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 22, G06K 940, G06K 948

Patent

active

053554213

ABSTRACT:
A method for identifying and removing noise from digitized images includes the steps for judging whether or not a group of black pixels represents a noise by analyzing the number of pixels in the group, the degree of flattening of the group and the curvature of the region. According to the inventive method, since the entire region is scanned at once, allowing the detection of various sized pixel groups, the black pixel groups meeting a predetermined level can be selected and removed from a corresponding predefined region. Thus, noise can be removed from several predefined regions using a different noise level for each region.

REFERENCES:
patent: 3700797 (1972-10-01), Wernikoff
patent: 3980870 (1976-09-01), Kawahara
patent: 4691366 (1987-09-01), Fenster et al.
patent: 4703512 (1987-10-01), Saka et al.
patent: 4769849 (1988-09-01), Alsing
patent: 5029226 (1991-07-01), Klein et al.
patent: 5048096 (1991-09-01), Beato
patent: 5189710 (1993-02-01), Holt

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