Multimedia
What is Multimedia?
The answer is neither simple nor easy,Multimedia is the combination of computer and video technology,In fact,Multimedia is just two media,sound and pictures,It is made from a mix of hardware and software,or machine and ideas,
Actually,some people see multimedia is the combination of PCs and video,Multimedia PC needs to be more powerful than mainstream computer,At least the multimedia PC defines the mainstream,If you want separate a ordinary computer from multimedia,the only things are a soundboard and a CD-ROM driver,The CD serves as multimedia's chief storage and exchange medium.
So what is multimedia? Now you should agree that multimedia isn't any one thing,but it is a complex entity,It involves the many things,hardware,software,and the interface where they meet,But we've forgotten the most important thing,The thing is multimedia involves you,You don' t have to be a passive recipient with multimedia,You can control,You can interact,You can make it do what you want it to do,That's the strength of multimedia.
What does multimedia do? It presents information,shares ideas and educes emotions,It enables you to see,hear,and understand the thoughts of others,In other words,it is a form of communication.
参考译文什么是多媒体？
要回答这个问题不那么容易。多媒体是计算机和视频技术的结合，实际上它只是两个媒体：声音和图像。它由硬件和软件，或机器和思想混合组成。
事实上，有人就认为多媒体是电脑和电视的结合。多媒体电脑需要比主流电脑功能强大，多媒体电脑决定了主流电脑的发展。区别普通电脑和多媒体电脑的主要东西是声卡和只读光盘驱动器。光盘是多媒体的主要存储和交换媒体。
那什么是多媒体？现在就可以回答了。它不只是一件东西，而是一个包括许多东西的复杂的实体：硬件、软件和这两者相遇时的界面。我们还忘了一件最重要的事情。多媒体还包括你。对于多媒体，你不再是一个被动的观众，你可以控制，可以交互作用，可以让它按你的需要去做。这就是多媒体的力量。
多媒体能做什么？它可以展示信息、交流思想和抒发情感。它让你看到、听到和理解其他人的思想。也就是说，它是一种通信的方式。
Uses for Multimedia
Now we advocated one thing,The thing is that use multimedia to expand the uses of computers,Let's take a look at some certain areas,Multimedia could have a direct impact to these areas:
Computer-based training (CBT)
Many companies are turning to multimedia applications to train their employees,They found it has saved expenses and trained employees more effectively by using a multimedia application.
Education
The essence of multimedia is to make computers more interesting,Multimedia can make the learning process more interesting,So it will help the learning process,
Entertainment
In many cases,today’s best games use the graphics technology,In addition,writing entertainment applications (that is,games) can be a lot of fun,
Information access
This is the age of information,We often find nothing with so much information,Multimedia provides effective ways to organize information and search for facts,
Business presentations
To many companies,presenting information to business professionals is a required form of communication,Applications are already available for creating great-looking presentations,and through multimedia these applications will become even better and more effective,
Obviously,multimedia has many uses,and the only limitation is your imagination.
参考译文多媒体的使用现在所提倡的是用多媒体来扩大计算机的使用范围。让我们看一下多媒体对其有直接影响的领域：
(1) 基于计算机的培训（CBT）。许多公司正转向使用多媒体应用程序培训其职员。他们发现这既节省开支，又更加成效。
(2) 教育。多媒体的本质是使计算机变得更有意思。多媒体让学习过程更加趣味化并有助于学习。
(3) 娱乐。在许多情况下，当今最好的游戏软件中使用的图形技术将被用于明天的商业软件。另外，编写娱乐（即游戏）软件本身也很有趣。
(4) 信息获取。人们常说现在是信息时代。这么多信息让人难以查找。多媒体为迅速而有效地组织信息和查找信息提供了多种有效的方法。
(5) 商业演示。在许多公司中，向商业人员演示信息是一种必需的通信形式。应用软件已经可以制作出十分漂亮的演示文稿，而通过多媒体，这些应用软件也变得更好、更有效。
显然多媒体有许多用途，惟一的局限是你的想像力。
Digital Video
A major goal of the MPEG-2 video standard is to define the format of the video data which is to be transmitted,This data format is the result of a compression and encoding process,If the compression techniques are used in MPEG-2,then they are to a large extent based on the some knowledge,The knowledge is that we have about how the human eye and the visual centers in the brain recognize images.
So far,the human eye has been described,And its capabilities to recognize images have been described,too,But how are the images described and structured in digital equipment? Video applications deal with so called color spaces in order to define images,
There are two major color spaces types used in digital video,RGB and YUV/YCrCb,RGB is commonly used in computer environments,while YUV/YCrCb is related more to the television world.
In the RGB color spaces,each pixel on the screen has a corresponding RGB value,The RGB value is composed of three components,They define a value for the red,the green and the blue parts of the color.
YUV separates color information differently than RGB,YUV doesn’t break the color down to red,green,and blue components,It divides into intensity (Y) and two color components (U and V),The Y component is basically black and white information,It is also called luminance,The U and V components are called chrominance,This color space has some important advantages,A black and white display only uses the luminance component of the signal,The color display will use both luminance and chrominance information,The video compression technique,used in MPEG-1 and MPEG-2,works with YUV color space,
If video is represented digitally,there are quite a few options,They include,the horizontal and vertical resolution of the picture,the number of pictures per second,and the number of bits used to store the color information.
参考译文数字视频
MPEG-2视频标准的主要目的是定义要传输的视频数据格式。该数据格式是经压缩和编码处理后的结果。用于MPEG-2中的压缩技术在很大程度上是以目前一些知识为基础的。这些知识是我们拥有的、有关人眼与大脑视觉中心识别图像原理的知识。
迄今为止，人眼及其识别图像的能力已有所论述。但在数字化设备中图像是如何被描述的？其结构又如何呢？视频应用软件用所谓的色彩空间来定义图像。
在数字视频中，主要使用两类色彩空间：RGB和YUV/YCrCb。RGB常用于计算机环境，而YUV/YCrCb则更多与电视领域有关。
在RGB色彩空间中，屏幕上的每一个像素对应一个RGB值。RGB的值由3个分量组成，它们分别定义了红、绿、蓝3个颜色。
YUV分离颜色信息与RGB不同。它不是把颜色分成红、绿、蓝3个分量，而是分成明度Y和两个颜色分量U、V。Y分量主要是黑、白信息，也称为亮度。U和V分量被称为色度。对电视应用而言，这个色彩空间有其重要的优势。黑、白显示时仅用信号的亮度分量，而彩色显示时则用亮度和色度两个信息。使用在MPEG-1、MPEG-2中的视频压缩技术就运用了YUV色彩空间。
如果将视频数字化，有几点要考虑，它们包括：画面的水平和垂直方向的分辨率，每秒钟显示的画面数以及用来存储色彩信息的比特数。
What is Multimedia?
The answer is neither simple nor easy,Multimedia is the combination of computer and video technology,In fact,Multimedia is just two media,sound and pictures,It is made from a mix of hardware and software,or machine and ideas,
Actually,some people see multimedia is the combination of PCs and video,Multimedia PC needs to be more powerful than mainstream computer,At least the multimedia PC defines the mainstream,If you want separate a ordinary computer from multimedia,the only things are a soundboard and a CD-ROM driver,The CD serves as multimedia's chief storage and exchange medium.
So what is multimedia? Now you should agree that multimedia isn't any one thing,but it is a complex entity,It involves the many things,hardware,software,and the interface where they meet,But we've forgotten the most important thing,The thing is multimedia involves you,You don' t have to be a passive recipient with multimedia,You can control,You can interact,You can make it do what you want it to do,That's the strength of multimedia.
What does multimedia do? It presents information,shares ideas and educes emotions,It enables you to see,hear,and understand the thoughts of others,In other words,it is a form of communication.
参考译文什么是多媒体？
要回答这个问题不那么容易。多媒体是计算机和视频技术的结合，实际上它只是两个媒体：声音和图像。它由硬件和软件，或机器和思想混合组成。
事实上，有人就认为多媒体是电脑和电视的结合。多媒体电脑需要比主流电脑功能强大，多媒体电脑决定了主流电脑的发展。区别普通电脑和多媒体电脑的主要东西是声卡和只读光盘驱动器。光盘是多媒体的主要存储和交换媒体。
那什么是多媒体？现在就可以回答了。它不只是一件东西，而是一个包括许多东西的复杂的实体：硬件、软件和这两者相遇时的界面。我们还忘了一件最重要的事情。多媒体还包括你。对于多媒体，你不再是一个被动的观众，你可以控制，可以交互作用，可以让它按你的需要去做。这就是多媒体的力量。
多媒体能做什么？它可以展示信息、交流思想和抒发情感。它让你看到、听到和理解其他人的思想。也就是说，它是一种通信的方式。
Uses for Multimedia
Now we advocated one thing,The thing is that use multimedia to expand the uses of computers,Let's take a look at some certain areas,Multimedia could have a direct impact to these areas:
Computer-based training (CBT)
Many companies are turning to multimedia applications to train their employees,They found it has saved expenses and trained employees more effectively by using a multimedia application.
Education
The essence of multimedia is to make computers more interesting,Multimedia can make the learning process more interesting,So it will help the learning process,
Entertainment
In many cases,today’s best games use the graphics technology,In addition,writing entertainment applications (that is,games) can be a lot of fun,
Information access
This is the age of information,We often find nothing with so much information,Multimedia provides effective ways to organize information and search for facts,
Business presentations
To many companies,presenting information to business professionals is a required form of communication,Applications are already available for creating great-looking presentations,and through multimedia these applications will become even better and more effective,
Obviously,multimedia has many uses,and the only limitation is your imagination.
参考译文多媒体的使用现在所提倡的是用多媒体来扩大计算机的使用范围。让我们看一下多媒体对其有直接影响的领域：
(1) 基于计算机的培训（CBT）。许多公司正转向使用多媒体应用程序培训其职员。他们发现这既节省开支，又更加成效。
(2) 教育。多媒体的本质是使计算机变得更有意思。多媒体让学习过程更加趣味化并有助于学习。
(3) 娱乐。在许多情况下，当今最好的游戏软件中使用的图形技术将被用于明天的商业软件。另外，编写娱乐（即游戏）软件本身也很有趣。
(4) 信息获取。人们常说现在是信息时代。这么多信息让人难以查找。多媒体为迅速而有效地组织信息和查找信息提供了多种有效的方法。
(5) 商业演示。在许多公司中，向商业人员演示信息是一种必需的通信形式。应用软件已经可以制作出十分漂亮的演示文稿，而通过多媒体，这些应用软件也变得更好、更有效。
显然多媒体有许多用途，惟一的局限是你的想像力。
Digital Video
A major goal of the MPEG-2 video standard is to define the format of the video data which is to be transmitted,This data format is the result of a compression and encoding process,If the compression techniques are used in MPEG-2,then they are to a large extent based on the some knowledge,The knowledge is that we have about how the human eye and the visual centers in the brain recognize images.
So far,the human eye has been described,And its capabilities to recognize images have been described,too,But how are the images described and structured in digital equipment? Video applications deal with so called color spaces in order to define images,
There are two major color spaces types used in digital video,RGB and YUV/YCrCb,RGB is commonly used in computer environments,while YUV/YCrCb is related more to the television world.
In the RGB color spaces,each pixel on the screen has a corresponding RGB value,The RGB value is composed of three components,They define a value for the red,the green and the blue parts of the color.
YUV separates color information differently than RGB,YUV doesn’t break the color down to red,green,and blue components,It divides into intensity (Y) and two color components (U and V),The Y component is basically black and white information,It is also called luminance,The U and V components are called chrominance,This color space has some important advantages,A black and white display only uses the luminance component of the signal,The color display will use both luminance and chrominance information,The video compression technique,used in MPEG-1 and MPEG-2,works with YUV color space,
If video is represented digitally,there are quite a few options,They include,the horizontal and vertical resolution of the picture,the number of pictures per second,and the number of bits used to store the color information.
参考译文数字视频
MPEG-2视频标准的主要目的是定义要传输的视频数据格式。该数据格式是经压缩和编码处理后的结果。用于MPEG-2中的压缩技术在很大程度上是以目前一些知识为基础的。这些知识是我们拥有的、有关人眼与大脑视觉中心识别图像原理的知识。
迄今为止，人眼及其识别图像的能力已有所论述。但在数字化设备中图像是如何被描述的？其结构又如何呢？视频应用软件用所谓的色彩空间来定义图像。
在数字视频中，主要使用两类色彩空间：RGB和YUV/YCrCb。RGB常用于计算机环境，而YUV/YCrCb则更多与电视领域有关。
在RGB色彩空间中，屏幕上的每一个像素对应一个RGB值。RGB的值由3个分量组成，它们分别定义了红、绿、蓝3个颜色。
YUV分离颜色信息与RGB不同。它不是把颜色分成红、绿、蓝3个分量，而是分成明度Y和两个颜色分量U、V。Y分量主要是黑、白信息，也称为亮度。U和V分量被称为色度。对电视应用而言，这个色彩空间有其重要的优势。黑、白显示时仅用信号的亮度分量，而彩色显示时则用亮度和色度两个信息。使用在MPEG-1、MPEG-2中的视频压缩技术就运用了YUV色彩空间。
如果将视频数字化，有几点要考虑，它们包括：画面的水平和垂直方向的分辨率，每秒钟显示的画面数以及用来存储色彩信息的比特数。
