Image analysis – Image enhancement or restoration – Edge or contour enhancement
Reexamination Certificate
2007-10-02
2007-10-02
Mehta, Bhavesh M (Department: 2624)
Image analysis
Image enhancement or restoration
Edge or contour enhancement
C382S233000, C382S252000, C382S275000, C375S240290
Reexamination Certificate
active
10605695
ABSTRACT:
A de-blocking method smoothes pixels along a row or column that crosses a block boundary. Smoothing is performed to remove quantization or compression artifacts that appear on block edges when pixels in adjacent blocks are separately compressed. A maximum-allowed edge-pixel difference is generated from the quantization parameter QP. For each edge-crossing row or column, an edge difference is generated as half the difference between adjacent edge pixels in two blocks. This edge difference is compared to the maximum-allowed edge-pixel difference. When the edge difference is larger than the maximum-allowed edge-pixel difference, then the difference is limited to the maximum-allowed edge-pixel difference, since the pixel difference may be a real edge in the image. The limited or edge difference is then added or subtracted in decreasing amounts for several pixels in the row or column near the edge, smoothing the edge difference across several pixels, such as seven pixels.
REFERENCES:
patent: 5454051 (1995-09-01), Smith
patent: 5590064 (1996-12-01), Astle
patent: 5629778 (1997-05-01), Reuman
patent: 5796875 (1998-08-01), Read
patent: 5883983 (1999-03-01), Lee et al.
patent: 5949908 (1999-09-01), Sugahara
patent: 5974196 (1999-10-01), Chang et al.
patent: 6040879 (2000-03-01), Park
patent: 6115503 (2000-09-01), Kaup
patent: 6144700 (2000-11-01), Kim et al.
patent: 6160503 (2000-12-01), Andrews et al.
patent: 6225923 (2001-05-01), Andrews
patent: 6240135 (2001-05-01), Kim
patent: 6298161 (2001-10-01), Koo et al.
patent: 6456394 (2002-09-01), Gwaltney et al.
patent: 6529638 (2003-03-01), Westerman
patent: 6539060 (2003-03-01), Lee et al.
patent: 6859499 (2005-02-01), Hashimoto
patent: 7215823 (2007-05-01), Miura et al.
patent: 2001/0020906 (2001-09-01), Andrews et al.
patent: 2001/0021276 (2001-09-01), Zhou
patent: 2003/0035586 (2003-02-01), Chou et al.
Chou et al “Simple Alogrithm for Removing Blocking Artifacts in Block-Transform Coded Images”; Jim Chou, Matthew Crouse, and Kannan Ramchandarn; IEEE Signal Processing Letters, vol. 5, No. 2, Feb. 1998.
Fununaga et al., “MPEG-4 Video Verification Model version 13.3”, ISO/IEC JTC1/SC29/WG11, MPEG99/4960. Oct. 1999, section 9.1 DeBlocking Filter, pp. 1, 257-259.
Auvinen Stuart T.
g Patent LLC
Lavin Christopher
Mehta Bhavesh M
Redrock Semiconductory Ltd.
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