计算机与数字工程
計算機與數字工程
계산궤여수자공정
Computer and Digital Engineering
2015年
9期
1662-1667
,共6页
H.264帧间模式选择%降采样%SKIP宏块检测%UM HexagonS
H.264幀間模式選擇%降採樣%SKIP宏塊檢測%UM HexagonS
H.264정간모식선택%강채양%SKIP굉괴검측%UM HexagonS
H .264 inter mode selection%down-sampling method%SKIP macroblock detection%UM HexagonS
针对 H ．264中帧间模式选择算法复杂度过高的问题，论文提出一种快速帧间模式选择算法。算法采用降采样方式对 SKIP 宏块进行检测与预判，有效降低宏块全零检测的计算量；改进 UM HexagonS 算法，对宏块与宏块分割使用降采样的方式进行运动搜索，大大减少原算法中块匹配的计算量；根据子宏块运动同质性来缩小最优模式的选择区间。与采用 UM HexagonS 的 x264帧间模式选择算法比较，所提的算法在维持原有码率与峰值信噪比基本不变的情况下，使编码时间平均减少40％，显著提高了编码效率。
針對 H ．264中幀間模式選擇算法複雜度過高的問題，論文提齣一種快速幀間模式選擇算法。算法採用降採樣方式對 SKIP 宏塊進行檢測與預判，有效降低宏塊全零檢測的計算量；改進 UM HexagonS 算法，對宏塊與宏塊分割使用降採樣的方式進行運動搜索，大大減少原算法中塊匹配的計算量；根據子宏塊運動同質性來縮小最優模式的選擇區間。與採用 UM HexagonS 的 x264幀間模式選擇算法比較，所提的算法在維持原有碼率與峰值信譟比基本不變的情況下，使編碼時間平均減少40％，顯著提高瞭編碼效率。
침대 H ．264중정간모식선택산법복잡도과고적문제，논문제출일충쾌속정간모식선택산법。산법채용강채양방식대 SKIP 굉괴진행검측여예판，유효강저굉괴전령검측적계산량；개진 UM HexagonS 산법，대굉괴여굉괴분할사용강채양적방식진행운동수색，대대감소원산법중괴필배적계산량；근거자굉괴운동동질성래축소최우모식적선택구간。여채용 UM HexagonS 적 x264정간모식선택산법비교，소제적산법재유지원유마솔여봉치신조비기본불변적정황하，사편마시간평균감소40％，현저제고료편마효솔。
Aiming at the problem that complexity of H .264 inter frame mode decision algorithm is high ,a fast inter frame mode selection algorithm is proposed in this paper .The algorithm employs down‐sampling method to detect and antici‐pate the SKIP macroblocks ,which can effectively reduce the computation of all‐zero macroblock detection .Meanwhile ,the proposed algorithm applies down‐sampling method to the motion estimation search procedure of macroblaock and its segmen‐tations ,which can greatly reduce the computation of block matching in original algorithm .And also ,the proposed algorithm narrows the range of optimal mode ,according to sub‐macroblock motion homogeneity .When compared with the x264 inter frame mode selection algorithm using UM HexagonS ,the proposed algorithm reduces about 40% encoding time on average , while keeping the original stream bit rate and the peak signal to noise ratio substantially unchanged ,and significantly im‐proves the coding efficiency .
