Method of processing digital images for low-bit rate...

Details Method of processing digital images for low-bit rate... Method of processing digital images for low-bit rate...

2006-10-17

2006-10-17

Tran, Phuoc (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S233000, C382S268000

Reexamination Certificate

active

07123776

ABSTRACT:
The present invention relates to a method of processing digital images comprising pixel blocks, said method comprising a step of detecting blocking artifacts (41) between two adjacent blocks (Bj,bk), and a step of filtering (43) the pair of adjacent blocks. The method according to the invention further comprises a filter decision step (42) based on a comparison between luminance values of the pixels of the two adjacent blocks and a reference function representing a difference of minimum luminance values that can be seen by an observer as a function of an average luminance area of the image in order to determine whether a difference of luminance between the blocks is either or not visible to an observer.

REFERENCES:
patent: 6636645 (2003-10-01), Yu et al.
patent: 7003174 (2006-02-01), Kryukov et al.
ISO/IEC 14496-2:2000(E), pp. 432-436.
Derviax et al: “A Postprocessing Technique For Block Effect Elimination Using A Perceptual Distortion Measure” 1997 IEEE International Conference On Acoustics, Speech, And Signal Processing. Multidimensional Signal Processing, Neural Networks. vol. 4, 1997, pp. 3001-3004.
Derviaux et al: “Blocking Artifact Reduction Of DCT Coded Image Sequences Using A Visually Adaptive Postprocessing” Proceedings Of The International Conference On Image Processing (ICIP) vol. 2, Sep. 16, 1996, pp. 5-8.
ISO/IEC 14496-2:2000 (E).

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