US 7,321,698 B2
Methods and apparatus for transform coefficient filtering
Fang Wu, San Jose, Calif. (US); Ke Shen, Sunnyvale, Calif. (US); Yi Tong Tse, San Jose, Calif. (US); and Sangeeta Ramakrishnan, San Jose, Calif. (US)
Assigned to Cisco Technology Inc., San Jose, Calif. (US)
Filed on Aug. 30, 2006, as Appl. No. 11/514,122.
Prior Publication US 2006/0291729 A1, Dec. 28, 2006
This patent is subject to a terminal disclaimer.
Int. Cl. G06K 9/46 (2006.01)
U.S. Cl. 382—250 23 Claims
OG exemplary drawing
 
1. An apparatus for filtering transform coefficients associated with an input bitstream, the apparatus comprising:
an input interface for receiving transform coefficients associated with input bits;
a filtering stage coupled to the input interface, wherein the filtering stage selects transform coefficients for filtering, wherein the transform coefficients associated with the input bitstream are selected differentially on a per block or a per macroblock basis,
and wherein the method selectively filters fewer transform coefficients in a macroblock according to the number of the macroblock in a frame; and
an output interface coupled with the filtering stage for providing modified transform coefficients associated with output bits, wherein the number of output bits is less than the number of input bits.