Pattern-based video coding representing moving regions inmacroblock has very good potential for improved coding efficiency overexisting standard H.264/AVC in the very low bit-rate range. However, thecoding efficiency diminishes compared to H.264 with the bit rates becausevariable block sizes of H.264 for motion estimation and compensation aresuccessfully selected for any bit rates using weighting between bit rate andimage quality. The existing pattern-based video coding scheme could nothandle this flexibility with bit rates due to its fixed size and lack of verificationwith other modes of H.264. In this paper we propose two large and one smallpre-defined pattern sets and treat them as extra modes of H.264. We alsoinvestigate the weighting factor between bit rate and image quality compared tothe existing one. The experimental results confirm the superiority of ourapproach compared to H.264 and other existing pattern-based video coding fornot only the very low bit rate range but also wide range of bit rates.
|Number of pages||10|
|Publication status||Published - 2007|