Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2005-07-29
2010-12-28
Philippe, Gims S (Department: 2482)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C382S260000
Reexamination Certificate
active
07860167
ABSTRACT:
An efficient and non-iterative 3D post processing method and system is proposed for mosquito noise reduction, block localization and correction in DCT block-based decoded images. The 3D post processing is based on a simple classification that segments a picture in multiple regions such as Edge, Near Edge, Flat, Near Flat and Texture regions. The proposed technique comprises also an efficient and shape adaptive local power estimation for equivalent additive noise and provides simple noise power weighting for each above cited region. Temporal filtering configurations using Minimum Noise Variance Criterion are proposed for reducing temporally varying coding artifacts. A Minimum Mean Square Error or Minimum Mean Square Error-like noise reduction with robust and effective shape adaptive windowing is utilized for smoothing mosquito and/or random noise for the whole image, particularly for Edge regions. The proposed technique comprises also signal domain histogram analysis based Block Localization and adaptive edge based Block artifact correction. Finally, is also proposed an optional adaptive detail enhancer which can enhances the luminance signal in eight directions differently.
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Dinh Chon Tam Le
Nguyen Duong Tuan
Nguyen Ngoc Lan
Nguyen Thi Thanh Hien
Viet Ha Do
Abecassis Alexandre
Algolith Inc.
Fasken Martineau DuMoulin LLP
Philippe Gims S
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