The dct was used as the main method of image transform coding for a long time 图像压缩编码长期以来利用离散余弦变换( dct )作为变换编码的主要技术。
The technique of dct - based digital watermarking for copyright protection of static image is studied in this paper 文中研究了基于静态图像的离散余弦变换域的数字水印版权保护技术。
As we all known , the r , g , b components of a frame describes the same texture and margin of the image 本文结合四维矩阵及四维矩阵离散余弦变换理论,提出了一种基于上下文的四维矩阵彩色视频的压缩编码方法。
Therefore , people have shown great concern of image compression . the international compression standard , having dct as the core has formed 为此,人们给予了图像压缩技术广泛的关注,形成了以离散余弦变换编码为核心的多种国际压缩标准。
The emphases of the researches are focused on the dct transform in the video signals processing , the theories of huffman encode and motion compensation algorithms 主要研究了离散余弦变换对视频图像的处理,霍夫曼编码原则和运动补偿的原理。
Data correlation coefficients were calculated and switch regions were analyzed by using two dimension discrete cosine transform ( dct ) in ray - space data compression 在光线空间的数据压缩中,计算了数据的相关系数,采用二维离散余弦变换( dct )进行了变换域分析。
The block - based discrete cosine transform ( bdct ) suffers from visible blocking artifacts between adjacent image blocks at low bit rates , which reduces the image visual quality 摘要块离散余弦变换在低比特率时其恢复图像的块边界上会出现明显可见的方块效应,从而降低了图像的视觉质量。
The image compression standard in pacs now is the jpeg standard based on the dct ( discrete cosine transform ) algorithm , which can only be applied in the limited areas 目前在pacs系统中较多采用的是jpeg图像压缩标准,该标准采用以离散余弦变换算法为主的区块编码方式,但有一定的局限性。
Abstract : the present paper presents a new method for constructing optimal quantisation tables . the method produces optimal rate - distortion performance in a fixed block size dct 文摘:提出一种构造择优量化表的新方法.在一个固定块尺寸的离散余弦变换( dct )中,该方法可产生优化的率失真特性
This method makes use of ti company chip of dm642 . and the algorithm of image compression based on dct transform , adding the digital watermark based on dwt 本方案采用了ti公司的媒体处理器dm642作为核心处理芯片;然后采用以离散余弦变换为基础的压缩算法,并在压缩后的图像中添加数字水印信息。