摘要
针对突变和渐变的特点,提出了一种适合突变检测的二次帧差法和适合渐变检测的窗口最大值法.二次帧差法通过计算相邻帧差之间的二次帧差,有效地突出了突变的特征,而窗口最大值法通过计算非相邻帧之间的帧差有效地突出了渐变的特征.利用窗口最大值准确地找到了渐变的中心位置,两种方法的有机结合可有效地检测出几乎所有的突变和渐变.该方法不用设置全局阈值,适应性强,实验结果表明了该算法的有效性.
According to the characters of abrupt change and gradual change, a twice difference based method and a window-difference maximum based method are proposed for abrupt change detection and gradual change detection separately. Characters of abrupt change are revealed effectively by computing twice frame difference between two neighbor frame differences. Characters of gradual change are revealed effectively by computing non-neighbor frame difference between two non-neighbor frames and the center position of gradual change is discovered by computing non-neighbor frame difference maxima within a window. Integrating the two methods can almost detect all shot boundaries no matter what the shot boundary type is. The method does not need to set global threshold and has high adaptability. Experimental results show that the method is efficient.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第11期949-953,共5页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(60271018)
关键词
视频检索
镜头边界检测
突变
渐变
二次帧差
video retrieval
shot boundary detection
abrupt change
gradual change
twice difference
