Picture enhancement in video and block-coded image sequences

Author

Scognamiglio, Gaetano ; Rizzi, Andrea ; Albani, Luigi ; Ramponi, Giovanni

Author_Institution

Dipt. di Elettrotecnica, Elettronica ed Inf., Trieste Univ., Italy

Volume

45

Issue

3

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

680

Lastpage

689

Abstract

We propose a sharpness enhancement technique for video and decoded image sequences. Basically, the enhancement is accomplished by adding overshoot to luminance edges in an unsharp masking-like way. However, the optimal amount of overshoot added for a high image quality depends on the local image statistics. For this purpose, controls are introduced, to improve the performances and to adapt the operator to moving sequences with different characteristics. Both spatial and temporal information is used to enhance details, avoiding blocking artifacts and noise

Keywords

image coding; image enhancement; image sequences; video signal processing; block-coded image sequences; blocking artifacts; decoded image sequences; high image quality; local image statistics; luminance edges; moving sequences; noise; overshoot; picture enhancement; sharpness enhancement technique; unsharp masking-like method; video; Decoding; Electronic mail; Image quality; Image sequences; Image storage; Noise level; Noise reduction; Nonlinear filters; Statistics; TV;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.793569

Filename

793569