计算机应用与软件
計算機應用與軟件
계산궤응용여연건
COMPUTER APPLICATIONS AND SOFTWARE
2015年
4期
191-194,238
,共5页
关键帧%运动目标%三帧差分法%特征向量%零水印
關鍵幀%運動目標%三幀差分法%特徵嚮量%零水印
관건정%운동목표%삼정차분법%특정향량%령수인
Key frame%Moving object%Three frames differencing%Feature vector%Zero-watermarking
为了提高视频水印的鲁棒性和隐蔽性，提出一种将水印与视频内容特征相结合的零水印方案。通过帧间欧氏距离选取关键帧，利用改进帧差法提取视频关键帧中运动目标，对关键帧的运动目标进行子块分割，选择运动目标几何形心所在块构成三维体块；再将三维体块分割成多个大小相等的小三维体块，利用小三维体块中所有子块的离散余弦变换直流系数构造特征向量；最后利用特征向量实现将水印零嵌入到视频内容中。实验表明，该算法未破坏原视频内容，不仅具有很好的隐蔽性，还能有效地抵抗旋转、压缩编码等攻击。
為瞭提高視頻水印的魯棒性和隱蔽性，提齣一種將水印與視頻內容特徵相結閤的零水印方案。通過幀間歐氏距離選取關鍵幀，利用改進幀差法提取視頻關鍵幀中運動目標，對關鍵幀的運動目標進行子塊分割，選擇運動目標幾何形心所在塊構成三維體塊；再將三維體塊分割成多箇大小相等的小三維體塊，利用小三維體塊中所有子塊的離散餘絃變換直流繫數構造特徵嚮量；最後利用特徵嚮量實現將水印零嵌入到視頻內容中。實驗錶明，該算法未破壞原視頻內容，不僅具有很好的隱蔽性，還能有效地牴抗鏇轉、壓縮編碼等攻擊。
위료제고시빈수인적로봉성화은폐성，제출일충장수인여시빈내용특정상결합적령수인방안。통과정간구씨거리선취관건정，이용개진정차법제취시빈관건정중운동목표，대관건정적운동목표진행자괴분할，선택운동목표궤하형심소재괴구성삼유체괴；재장삼유체괴분할성다개대소상등적소삼유체괴，이용소삼유체괴중소유자괴적리산여현변환직류계수구조특정향량；최후이용특정향량실현장수인령감입도시빈내용중。실험표명，해산법미파배원시빈내용，불부구유흔호적은폐성，환능유효지저항선전、압축편마등공격。
In order to improve the robustness and invisibility of video watermarking,we propose a zero-watermarking scheme which com-bines the watermarking with video content characteristics.It selects the key frames through interframe Euclid distance,uses improved frame difference algorithm to extract the moving objects in key frame,and segments the moving objects of key frame into sub-blocks.After selecting the blocks at the geometric centroid of moving object to reconstruct three-dimension block,the scheme then segments the three-dimension block to a couple of small three-dimension blocks in same size,and constructs the feature vector using DC coefficients of discrete cosine trans-form of all blocks in small three-dimension block.Finally,it uses feature vector to realise embedding the zero-watermarking into video con-tents.Experiments show that the algorithm does not damage original video content,apart from having very good imperceptibility,it can also effectively resist the attacks of rotation and compression coding,etc.
