Deblocking method and apparatus using edge flow-directed...

Details Deblocking method and apparatus using edge flow-directed... Deblocking method and apparatus using edge flow-directed...

2008-07-22

2008-07-22

Wu, Jingge (Department: 2624)

Image analysis

Image compression or coding

Lossless compression

C382S240000

Reexamination Certificate

active

07403665

ABSTRACT:
A deblocking method and apparatus using an edge flow-directed filter and curvelet transform for deblocking Block Discrete Cosine Transform (BDCT) compressed images. The deblocking method includes: extracting an edge flow vector from a Block Discrete Cosine Transform (BDCT) compressed image to identify a direction of changes in image attributes; performing a dyadic discrete wavelet transform on the BDCT compressed image; selectively filtering a highpass wavelet image among dyadic discrete wavelet transform compressed images according to an edge flow direction of an edge pixel; performing a curvelet transform on an image including the selectively filtered highpass wavelet image and wavelet images other than the highpass wavelet image; and estimating an original image before being BDCT compressed using the curvelet transform.

REFERENCES:
patent: 6678421 (2004-01-01), Daniell et al.
patent: 7054367 (2006-05-01), Oguz et al.
patent: 2003/0142750 (2003-07-01), Oguz et al.
patent: 2005/0013494 (2005-01-01), Srinivasan et al.
patent: 2006/0188013 (2006-08-01), Coimbra et al.

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