Title :
The effect of a loop filter on circulating noise in interframe video coders
Author :
Hollier, Christopher J. ; Arnold, J.F. ; Cavenor, Michael C.
Author_Institution :
Dept. of Electr. Eng., New South Wales Univ., Canberra, ACT, Australia
fDate :
8/1/1994 12:00:00 AM
Abstract :
An examination of the distribution of signals within the prediction loop of an interframe video codec reveals that small random fluctuations caused by the quantizer build up over a period of time. This quantization noise circulates within the prediction loop causing a gradual decrease in the signal to noise ratio of the reconstructed sequence and an increase in the required data rate. In general, both of these effects can be nullified by the inclusion of a low pass loop filter
Keywords :
codecs; error analysis; filtering and prediction theory; image coding; image reconstruction; image sequences; low-pass filters; motion estimation; parameter estimation; video equipment; video signals; circulating noise; data rate; distribution; interframe video codec; interframe video coders; low pass loop filter; prediction loop; quantization noise; random fluctuations; reconstructed sequence; signal to noise ratio; Codecs; Discrete cosine transforms; Feedback loop; Filtering; Filters; Frequency; Image coding; Image reconstruction; Quantization; Signal to noise ratio;
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
