Digital image processing method

Details Digital image processing method Digital image processing method

2007-08-07

2007-08-07

Tran, Phuoc (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

Reexamination Certificate

active

10341910

ABSTRACT:
The present invention relates to a method of post-processing a digital image (Im) comprising pixels, said digital image being encoded and decoded according to a technique of coding by blocks of pixels. Said method comprises a classification step (6) intended to allocate a class (Cli) to a block (Bj) of pixels of said digital image, a step of evaluating the degradation (5) of said digital image delivering a degradation measurement (DM) of said digital image, a filter selection step (9) intended to associate a filter (F1) with a pair of adjacent blocks (Bj, Bk) according to their respective classes (Clm, Cln) and the degradation measurement (DM) of said digital image, a filtering decision step (8) intended to deliver a filtering decision (Dec) for a pair of adjacent blocks (Bj, Bk) according to the degradation measurement (DM) and a filtering step (11) intended to filter a pair of adjacent blocks (Bj, Bk) by means of its associated filter (F1) delivering a filtered digital image (ImF). The advantage of such a method is that it is both of low complexity and very effective.

REFERENCES:
patent: 4849810 (1989-07-01), Ericsson
patent: 5920356 (1999-07-01), Gupta et al.
patent: 7003174 (2006-02-01), Kryukov et al.
Jung: PPL: A Low Complexity MPEG-4 Post-Processing Algorithm, Sep. 2001, pp. 1-8.
ISO/IEC 14496-2:1999/Amd.1:2000(E) , pp. 454-456.

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