In the second part : the emphasis of this part lies in discussing subband coding , wavelet transform coding and fractal coding , whose coding functions are better than the coding of having dct as the core 因此本文第二部分重点讨论了编码性能要优于离散余弦编码的子带编码、小波变换编码和分形编码。
An advantage of wavelet - based video compression is that it offers more graceful image degradation at high compression ratios , and it also eliminates the block artifacts seen in dct compression 由小波变换编码实现的视频压缩在具备高压缩比的基础上,仍拥有较高的主观视觉效果,避免了由分块dct变换引起的方块效应。
Thirdly dct is implemented using chen fast dct algorithm . we transform float - point arithmetic into fixed - point arithmetic , which meeting the precision requirements of the ieee 1180 standard , to accord with fixed - point c6201 dsps 随后在dct变换编码中,采用chen快速dct算法,在保证idct精度符合ieee1180标准条件下,将浮点dct系数转化为与c6201定点dsps运算单元相适应的定点系数。
This paper introduces the process of transform coding and the principle of still picture & moving picture compression and the standards of jpeg / mpeg - 2 and practical skill of the standards from the angle of the application and network in the development of dvd in front 本文前半部分主要从dvd的应用及未来网络化发展的角度,论述了变换编码、静止与活动图像压缩原理、 jpeg mpeg - 2标准和实用技术。
Digital image processing techniques have been being used more and more widely in many fields such as multimedia , the internet , television and fax , etc . image compression is one of the most important key techniques in image processing 数字图像处理技术在多媒体、因特网、电视、传真等领域的应用越来越广泛。图像压缩是数字图像处理中最重要的关键技术之一,传统的图像压缩方法有预测编码、变换编码和矢量量化等。
Vorbis coding algorithm can provide high quality audio compression with advanced perceptual coding and transform coding technologies ; and because of its completely open and non - patent , vobis has attracted more and more attentions by music industrial and audio users Vorbis编解码算法利用先进的感知编码和变换编码等技术提供高质量的音乐压缩,同时因为其完全开源和无专利版权费用的特点而逐渐受到音乐工业和用户的重视。
There is no motion compensation in the proposed scheme , so the method is simple and can be easily implemented in hardware . through the optimization of the quantization volume and scanning order , the 3d - dct based video coding scheme can obtain satisfactory results both in compression ratio and in psnr 3d - dct变换编码,没有运动补偿,运算复杂度低,通过优化量化表和扫描顺序,使3d - dct达到了令人满意的压缩比和图像质量。
Nowadays , video standards were established one by one , such as the series of h . 26x and the series of mpeg . although they belong to the different organization and adopt different codec schemes , the basic theories and technologies are same , such as both of their transform code technique adopt dct 相关视频通信标准相应提出,例如h . 26x系列, mpeg系列,它们虽然属于不同标准、采用了不同技术,但他们有着相通的地方,比如它们的变换编码都采用了dct 。
The survey of vidio compressed coding is introduced in this paper at first . then the vidio compressed method based on transform coding and the content of mpeg - 2 standard are presented . the hardware realization method of mpeg - 2 vidio compressed decoder is given in detail 本文首先介绍视频压缩编码发展的概况;然后介绍基于变换编码的视频压缩方法,并简要阐述mpeg - 2标准的内容;随后给出了一种基于专用芯片的mpeg - 2视频压缩编解码器硬件实现方法。
This scheme is based on the combination of traditional transform coding and prediction coding on motion compensation . and then rtp / rtcp is adopted to conduct information feedback , which makes associated error control in the coder and decoder 该视频编码方案以传统的变换编码与基于运动补偿的预测编码相结合的混合编码模式为基础,将信源编码与差错掩盖相结合的差错控制方法应用于其中,采用rtp / rtcp协议进行网络信息反馈,在编码端与解码端进行联合差错控制。