电子设计工程
電子設計工程
전자설계공정
ELECTRONIC DESIGN ENGINEERING
2015年
8期
132-135,139
,共5页
HEVC%帧内预测%模式选择%梯度
HEVC%幀內預測%模式選擇%梯度
HEVC%정내예측%모식선택%제도
HEVC%intra prediction%mode selection%gradient
高效视频编码(High Efficiency Video Coding，HEVC)相较于H.264/AVC,帧内预测模式有35种，编码性能得到提高的同时也引起了算法复杂度的增加，本文提出了一种基于Canny彩色算子的快速帧内预测模式选择算法。该算法基于图像物理边缘的梯度方向提前分析预测块（Prediction Unites，PU）的方向，预先确定帧内预测的模式，避免算法遍历35种帧内预测模式。实验结果表明，该算法能够有效地降低帧内编码的复杂度，算法编码时间平均减少23.36%而仅损失0.69%的BD-Rate，且率失真性能良好。
高效視頻編碼(High Efficiency Video Coding，HEVC)相較于H.264/AVC,幀內預測模式有35種，編碼性能得到提高的同時也引起瞭算法複雜度的增加，本文提齣瞭一種基于Canny綵色算子的快速幀內預測模式選擇算法。該算法基于圖像物理邊緣的梯度方嚮提前分析預測塊（Prediction Unites，PU）的方嚮，預先確定幀內預測的模式，避免算法遍歷35種幀內預測模式。實驗結果錶明，該算法能夠有效地降低幀內編碼的複雜度，算法編碼時間平均減少23.36%而僅損失0.69%的BD-Rate，且率失真性能良好。
고효시빈편마(High Efficiency Video Coding，HEVC)상교우H.264/AVC,정내예측모식유35충，편마성능득도제고적동시야인기료산법복잡도적증가，본문제출료일충기우Canny채색산자적쾌속정내예측모식선택산법。해산법기우도상물리변연적제도방향제전분석예측괴（Prediction Unites，PU）적방향，예선학정정내예측적모식，피면산법편력35충정내예측모식。실험결과표명，해산법능구유효지강저정내편마적복잡도，산법편마시간평균감소23.36%이부손실0.69%적BD-Rate，차솔실진성능량호。
Compared with H.264/AVC, High Efficiency Video Coding (HEVC) has 35 kinds of intra prediction modes and coding performance is improved while the complexity also has been added. An algorithm based on color Canny operator is proposed for fast intra prediction mode choice. The algorithm is according to the physical edge direction in Prediction Unites (PU), intra prediction modes are advanced analyzed and decided. The 35 kinds of intra prediction modes’ cost calculation have been avoided in this algorithm. Experimental results show that the proposed algorithm can effectively reduce the complexity of intra coding. The average encode speed is accelerated about 23.36%, while the BD-Rate has only about 0.69%gain and the RDO performance is well.
