Image preprocessing with selective lowpass filtering from...

Details Image preprocessing with selective lowpass filtering from... Image preprocessing with selective lowpass filtering from...

2001-04-25

2008-08-12

Vo, Tung (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

Reexamination Certificate

active

07412002

ABSTRACT:
Preprocessing for motion-compensated video encoding such as MPEG includes lowpass filtering, temporal (310) and/or spatial (312), locally per pixel in response to motion vector analysis and prediction error (304) and temporal change (306). This de-emphasizes image areas of rapid change which corresponds to human perception de-emphasis.

REFERENCES:
patent: 5477272 (1995-12-01), Zhang et al.
patent: 5502510 (1996-03-01), Kim et al.
patent: 5592226 (1997-01-01), Lee et al.
patent: 5990962 (1999-11-01), Ueno et al.
patent: 6037986 (2000-03-01), Zhang et al.
patent: 6396876 (2002-05-01), Babonneau et al.
patent: 6434196 (2002-08-01), Sethuraman et al.
patent: 6560371 (2003-05-01), Song et al.
Ke Shen, “Video preprocessing techniques for real-time video compression-noise level estimation techniques”, 42nd Midwest Symposium on Circuits and Systems, vol. 2, pp. 778-781, Aug. 1999.
Li Yan, “Noise reduction for MPEG type of codec”, IEEE International Conference on Acoustics, Speech, and Signal Processin vol. 5, pp. 429-432, Apr. 1994.
Chiu, Y. J., “A perceptual preprocessor to segment video for motion estimation” Proceedings Data Compression Conference, p. 534, Apr. 1998.

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