M PEG-4 SP仅支持IVOP和PVOP两种视频对象平面,因而在M PEG-2 M P到M PEG-4 SP的实时视频转码器中,必须将M PEG-2 M P中的B帧进行类型转换以及相应的运动矢量映射.在不考虑分辨率采样的情况下,提出了帧类型转换与运动矢量映射的具体方法...M PEG-4 SP仅支持IVOP和PVOP两种视频对象平面,因而在M PEG-2 M P到M PEG-4 SP的实时视频转码器中,必须将M PEG-2 M P中的B帧进行类型转换以及相应的运动矢量映射.在不考虑分辨率采样的情况下,提出了帧类型转换与运动矢量映射的具体方法,实验结果表明,在保证一定视频质量的情况下,该方法能够有效实现帧类型转换.展开更多
In this paper,in order to increase the amount of hiding information,we choose MPEG sequences as carriers and present a practical method focus on the steganographic method in MPEG compressed video sequences.Generally,t...In this paper,in order to increase the amount of hiding information,we choose MPEG sequences as carriers and present a practical method focus on the steganographic method in MPEG compressed video sequences.Generally,there are many B-frames in each GOP.We utilize the B-frames to hide information so that we can increase the amount of hiding information and decrease the tamper of the carriers.Hiding and extracting are performed in compressed video sequences without requiring original video.The experimental results show that the proposed method has the characteristics of less tampering on the visual effect and larger hiding capacity without increasing the volume of the carrier file.展开更多
基金Supported by the National Natural Science Youth Foundation of China (60903197)the National Natural Science Foundation of China (61173138)
文摘In this paper,in order to increase the amount of hiding information,we choose MPEG sequences as carriers and present a practical method focus on the steganographic method in MPEG compressed video sequences.Generally,there are many B-frames in each GOP.We utilize the B-frames to hide information so that we can increase the amount of hiding information and decrease the tamper of the carriers.Hiding and extracting are performed in compressed video sequences without requiring original video.The experimental results show that the proposed method has the characteristics of less tampering on the visual effect and larger hiding capacity without increasing the volume of the carrier file.
