帧内压缩

视频DV记录格式及其帧内压缩原理

DV record format and the principle of frame data compression

其次，分别研究了帧内压缩的DCT技术和帧间压缩的各种运动估计算法，分析了它们的技术关键、测试了各种算法的实际性能，验证了各自的技术特点。

Second , the DCT technology of compression in frame and the motion-estimation of compression between frames is researched separately . The article analyses the key technology of them , tests the actual capability of arithmetic and validates the technology characteristic of each arithmetic .

Motion-JPEG采用帧内压缩方式，处理费用很低，但缺少帧间预测和运动补偿所具有的高效率编码；

Motion-JPEG adopts intra-frame compress , the expense is quite low , but it lacks highly efficient compression possessed by inter-frame prediction and motion compensation .

目的了解数字视频信号的分量记录格式基础&DV记录格式及其帧内压缩原理。

Aim To find out the base of component track record format of the digital video signal , the DV-record format and the compressed principle in a single frame .

MPEG-2的标准具有开放性、实用性，它利用视频节目的空间和时间相关性，进行了帧内和帧间压缩，利于存储和传输，并保证了图像的质量。

MPEG-2 is an open , practical standard , it uses space and time correlation , carried out inter-frame and intra compression , which helps storage and transmission and ensures the image quality .

在以往视频压缩编码标准的算法中，I帧的压缩算法都是只利用帧内信息的帧内压缩算法，只有B帧和P帧利用的是帧间的信息。

For I-frame coding , existing coding standards only take use of information of itself , and for P-frame and B-frame , inter-frame information is used .

经过大量实验，结果显示三种关键帧提取方法与视频水印算法的结合可以使视频水印算法较好的抵抗MPEG-2帧内压缩、抗剪切攻击。

After a large number of experiments , the results show that the method which combinates the method of three types of key frame extraction and video watermarking algorithm can resist MPEG-2 interframe compression attack .