针对像素域和MPEG压缩域镜头边界检测方法的不足，充分利用H.264/AVC视频编码标准的新特性，提出一种从H.264/AVC压缩码流中直接检测镜头边界的方法。首先，对图像帧做4×4块划分，然后，统计相邻帧对应块的帧内预测模式差异或帧间预测模式差异，最后，通过自适应阈值判决，实现对不同类型的视频镜头边界检测。实验结果表明，该方法具有良好的查全率和查准率。

Aiming at some defect in pixel domain and the MPEG compressed domain for shot boundary detection，making full use of new characteristics of the H.264/AVC video coding standard，in this paper，we present a shot boundary detection method based on the H.264/AVC compressed domain.Firstly，the frame should be decomposed into 4×4 blocks，and then the difference information between the corresponding blocks in the intra-prediction mode or the inter-prediction mode is counted up.At last，the shot boundary detection is accomplished for different types of video by using adaptive threshold decision.Experimental results show that the proposed method achieves satisfactory performance of recall and precision.