NDLI: Post- and pre-processing in coding of image sequences using filters with motion compensated history

Content Provider	IEEE Xplore Digital Library
Author	Kronander, T.
Copyright Year	1988
Description	Author affiliation: Linkoping Univ., Sweden (Kronander, T.)
Abstract	To increase the performance of image coding of sequences it is beneficial to apply temporal prefiltering before coding to increase redundancy. To reduce the subjective impact of coding artifacts also temporal postfiltering can be applied after decoding. A problem with both of these techniques however (and of the more general techniques of image sequence enhancement using temporal filters) is that severe distortion may appear in moving objects. The author presents a method to avoid these artifacts of temporal filtering by introducing movement compensated temporal filtering. This technique yields an anisotropic, non-stationary 3-dimensional transfer function, which locally 'tracks' moving objects. The effect is that the problem of unsharp moving objects is significantly reduced, which allows for much lower cut-off frequencies than stationary filters do. The approach works both with FIR- and IIR-type filters. If a linear phase FIR filter is used for postfiltering, combined with a sampling rate increase, it can be seen as a motion compensated interpolator.<>
Starting Page	1104
Ending Page	1107
File Size	332747
Page Count	4
File Format	PDF
ISSN	15206149
DOI	10.1109/ICASSP.1988.196788
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-04-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image coding Image sequences History Finite impulse response filter Filtering Decoding Anisotropic magnetoresistance Motion compensation Transfer functions Cutoff frequency
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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