|United States Patent||7,620,258|
|Chen , et al.||November 17, 2009|
Extended amplitude coding for clustered transform coefficients
Coding quantized transform coefficients as occur in image compression combines a position coding method to code the position of clusters of consecutive non-zero-valued coefficients with an amplitude coding method to code the amplitudes of a concatenation of a plurality of the clusters. The amplitude coding method exploits that runs of amplitude 1 coefficients are more likely in the clusters than runs of other coefficient amplitudes.
|Inventors:||Chen; Wen-hsiung (Sunnyvale, CA), Toebes; John A. (Cary, NC)|
|Assignee:|| Cisco Technology, Inc. (San Jose, CA) |
|Filed:||November 9, 2005|