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多媒体信息主要包括文本、语音、图像三大类.语音信息主要有声音和音乐等不同种类的音频,而图像信息主要有静止图片和运动图形等不同种类的视频,这两种信号的信息量之大是传统的文字信息所不能比拟的.例如语音信息,它需要同时表达语音的内容、声强和音调,所以信息量和文本信息相比就显得庞大得多.对多媒体信息的处理一般包括常规信号的采集、数字化、滤波、重建等过程,也包括信息压缩、编码、存储等处理.其中信息压缩技术是多媒体通信中的关键环节.信息的压缩技术按照压缩前后信息量的变化来分,大体可分为无损压缩和有损压缩两大类:无损压缩:信息恢复后与压缩前一致,故又称之为可逆压缩,其中信息熵不能因为压缩而有任何改变.该压缩常用在那些对信息准确度要求较高的多媒体信息处理中,如计算机文本或程序.
The multimedia information mainly includes three categories of text, voice and image, and the voice information mainly includes different types of audio such as sound and music, and the image information mainly includes different kinds of videos such as still pictures and moving pictures, and the two types of information Large is the traditional text information can not match.For example, voice information, it needs to express the voice of the content, sound intensity and pitch, so the amount of information and text information is much larger compared to the processing of multimedia information, including general Signal acquisition, digitization, filtering, reconstruction and other processes, including information compression, encoding, storage, etc. Among them, information compression technology is the key link in multimedia communication.Compression technology of information is divided according to the change of information before and after compression Can be divided into two categories of lossless compression and lossy compression: lossless compression: information recovery and compression before the same, it is also known as reversible compression, in which the information entropy can not be any change due to compression.The compression is commonly used in those information Accurately demanding multimedia information processing, such as computer text or program.