压缩标准

• Next , one of the key technologies of digital image process - image compression is analyzed . and one of the standard of joint photographic experts group - jpeg is chosen
  然后，对该方案中数字图像处理的关键技术之一? ?图像压缩进行了分析，并确定将静态图像视频压缩标准? ? jpeg作为本方案中的视频压缩方式。
• - ii - moreover , we deal with the same images according to jpeg standard . finally , we compared the results of image compression by jpeg and jpeg2000 respectively
  同时，我们对这些图像采用了jpeg标准进行处理，对处理结果进行比较，从而验证了在pacs系统中采用jpeg2000图像压缩标准的优越性和可行性。
• This text compares and analyses various kinds of compression standards of the digital audio and video at first , has chosen mpeg - 4 compressed scheme as the video of monitoring system of video finally
  本文首先对数字音视频的各种压缩标准进行比较和分析，最终选取了mpeg - 4作为视频监控系统的视频压缩方案。
• And it has soon been used widely in the field of digital video encoder , because compared with special video encoder chip ; it has greater agility and potential of upgrade
  在dsp上用软件实现视频压缩成为数字视频压缩标准应用的一个亮点,因为与专门的视频压缩芯片相比,这种应用具有更大的灵活性和升级的潜力。
• The itu - t recommendation h . 263 + is widely used in this field for its high coding efficiency and strong error resilience . so research on it has significantly theoretic and practical importance
  263 +视频压缩标准以其高效的压缩效率和强的信道容错能力，在这类应用中获得了广泛使用，因此，对其进行研究具有重要的理论和实用价值。
• Now , the standards of speech compression coding provide a way of transporting speech signals efficiently . in fact , all of them are to reduce the baud rate of data under definite speech quality
  相继出现的语音信号压缩标准为语音信号的高效传输提供了一种有效方法，其实质就是在相当的语音质量指标下，降低数字化语音的数码率。
• Region - of - interest ( roi ) image coding is a new feature in the newly published jpeg2000 still image compression standard , which allows rois to be coded with better quality than the rest of an image , i . e . , background
  感兴趣区域（ roi ）图像编码处理，是联合图像专家组（ jpeg ）新推出的jpeg2000静态图像压缩标准中提供的一种新特性。
• Jpeg2000 is the next generation image compression standard . being different from the jpeg standard , it adopts the two - dimensional discrete wavelet transform ( 2d dwt ) while the jpeg adopts the discrete cosine transform
  Jpeg2000是新一代图像压缩标准,它放弃了传统的jpeg标准所采用的离散余弦变换,而采用了二维离散小波变换( 2ddwt ) 。
• H . 264 faces to the ip and wireless environment and its compression ratio is higher than existed ones . however , the complexity of the algorithm is very high . so the old standards are still working with the new one together
  H . 264标准是一个面向未来ip和无线环境下的视频压缩标准,其在视频压缩比方面比目前所有的视频压缩标准都要高。