Noise reduction apparatus

Details Noise reduction apparatus Noise reduction apparatus

1993-06-21

1995-06-13

Moore, David K.

Image analysis

Image enhancement or restoration

382199, 382281, 348618, 348620, 348622, G06K 940, H04N 521

Patent

active

054251141

ABSTRACT:
A field recursive type noise reduction apparatus is disclosed in which the field difference is divided into a plurality of frequency components by means of the Hadamard transformation and the existence of a boundary of an oblique line in the proximity of pixels to be processed is detected from frequency components remaining by removing minimum and maximum horizontal frequency components by an oblique line detection circuit. In the location where the existence of the boundary of oblique line is detected, a feedback rate of the apparatus is reduced to avoid deterioration of the image quality by nonlinear processing means and in other locations the feedback rate is increased to improve the S/N, so that a noise reduction apparatus is realized having excellent improvement of the S/N as compared with a conventional field recursive type noise reduction apparatus.

REFERENCES:
patent: 4242705 (1980-12-01), Ebihara
patent: 4860104 (1989-08-01), Katsuyama
patent: 4901150 (1990-02-01), Klingelhofer et al.
patent: 5247354 (1993-09-01), Nakajima
Patent Abstracts of Japan, vol. 16, No. 150 (E-1189) 14 Apr. 1992 & JP-A-04 004 676 (Matsushita Electric Industrial Co., Ltd.) 9 Jan. 1992.

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