Abstract
H.264/AVC achieves low bit-rate video stream which meets the requirement of video communication. The problem of H.264/AVC is the large computation burden. Thus fast algorithm should be adopted to reduce the computation burden to meet the limited power of the mobile device. This paper uses region-of-interest (ROI) detector to locate an “important” region and apply unequally coding in the encoder engine according ROI. Several coding parameters including quantization parameter (QP), candidates for mode decision, number of referencing frames and the search range of motion estimation are adaptively adjusted at the macroblock (MB) level. This design is decoding-friendly. Experimental result shows a large amount computation is saved and the subjective visual quality is kept or even improved.
