Image analysis – Image enhancement or restoration – Artifact removal or suppression
Reexamination Certificate
2006-04-18
2006-04-18
Chawan, Sheela (Department: 2623)
Image analysis
Image enhancement or restoration
Artifact removal or suppression
C382S264000, C375S240290
Reexamination Certificate
active
07031552
ABSTRACT:
A technique to reduce ringing artifacts in highly compressed block-based image/video coding is applied to each reconstructed frame output from the decoder. For each pixel block of a reconstructed frame, low-pass filtering is then adaptively applied according certain calculated differences between adjacent pixel values. For each pixel, a determination is made as to what type of horizontal filter, if any, is to be applied. Depending on the results of that determination, the pixel may remain unfiltered or may have a 2- or 3-tap horizontal filter applied to it. A similar process is undertaken to determine what type of vertical filter, if any, is to be applied, no filter, a 2-tap or a 3-tap vertical filter.
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Chawan Sheela
Gabrik Michael T.
Seiko Epson Corporation
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