[Paper Keywords]Multimedia Technology Audio Video Image
[Paper Abstract]Multimedia technology is the fastest growing and most active technology in the field of information technology today, and it is the focal point of the new generation of electronic technology development and competition. Multimedia technology combines computer, sound, text, images, animation, video and communications and other functions in one, with the growing popularity of high-speed information network, can realize the global networking of computers and information resources *** enjoy, so it is widely used in consulting services, books, education, communications, military, finance, medical and many other industries, and is subtly changing the face of our lives.
Multimedia includes
(1) text: data files composed of linguistic and symbolic characters.
(2) Image: a data file composed by describing the brightness, color, etc. of individual pixels in a picture. It is also called a bitmap or bitmap image.
(3) Graphics: Short for vector graphics. That is, the generation of a graphic by mathematical methods composed of data files. Graphics can generally be viewed as an abstraction of an image.
(4) animation: the static images, graphics and serial drawings, etc. Displayed in a certain time sequence to form a continuous moving picture.
(5) audio: sound signals, i.e., corresponding to the frequency within the perceptible range of human hearing.
(6) video: visual signals, i.e., dynamic information displayed on the computer screen, such as motion graphics, moving images, animation, etc.. Multimedia technology, on the other hand, refers to the use of computer technology, a variety of media in a digital way integrated together, so that the computer has the ability to acquire, process, edit, store and display multiple bodies of information at the same time.
I. The development process of multimedia technology
Before the birth of the computer, people have mastered many single-media utilization technology, such as text printing and publishing, telegraph/telephone communication, broadcasting and film, etc., but with the characteristics of multimedia technology to measure, these are not multimedia technology. After the birth of computers in the 1950s, computers evolved from binary codes that could only recognize combinations of 0's and 1's to systems that handled text and simple geometric shapes, and had the potential to handle more complex information technologies. With the development of technology, by the mid-1970s, there was a trend towards the integration of broadcasting, publishing and computers in the development of electronic media, which created favorable conditions for the rapid formation of multimedia technology. Usually, people put the United States in 1984 Apple launched the Macintosh machine as a sign of the arrival of the computer multimedia era.
In this process many representative ideas and systems appeared, which further promoted multimedia technology to maturity. With the development of computer technology, the need for standardization of related technologies has arisen, and the development of these standards more conducive to promote the rapid development of multimedia technology. After the development of these standards, the current multimedia computer system mainly has two kinds: one is Apple's PowerMax system, strong functions, high performance; another is the windows series operating system as a platform for MPC, is also the most widely used multimedia personal computer system.
In the development of multimedia technology at the same time, computer network technology and optical storage technology and so on are also developing. The emergence of large-capacity CD-ROM and DVD, to solve the problem of low-cost storage of multimedia information; and broadband multimedia networks to solve the problem of real-time and synchronization of information transmission of different media; broadcasting and television technology has also evolved from the previous analog technology to the stage of digital technology. With the expansion of multimedia applications and the further development of multimedia technology will accelerate the process of computer Internet, public **** communication network and broadcasting network, thus forming a fast, efficient multimedia information integrated network, to provide more humanized integrated multimedia information services. Broadband multimedia integrated network, high-performance MPC and interactive television technology integration, marking the multimedia technology has entered the multimedia network era.
Application of multimedia technology
The development of multimedia technology makes the information processing of computer more diversified and humanized on the basis of standardization and normalization, especially the combination of multimedia technology and network communication technology, which makes it possible to stay away from multimedia applications, and accelerates the application of multimedia technology in the fields of economy, science and technology, education, medical care, culture, media, entertainment and so on. Widely used. Multimedia technology has become one of the leading technologies of the information society.
The application of multimedia technology in business is mainly embodied in the aspects of commercial advertisement, product display, business training, multimedia commodity management and e-commerce.
The combination of multimedia technology and network communication technology has produced video telephony, video conferencing, multimedia e-mail, information on demand, and computing a collaborative work light application technology, the application of these technologies has changed people's lifestyles and habits of life to a certain extent, and will continue to have a profound impact on human life, learning and work.
Like television sets, tape recorders, stereos and other equipment into the family, MPC, digital video cameras, digital cameras, MP3 players, digital audio recorders and other multimedia products have become a necessity of life in the modern family, especially with the development of information residential neighborhoods, broadband network access, with multi-functional MPCs and various types of digital products can be both office, creation, learning, but also Games, entertainment. The use of interactive audio-visual features, the user can connect to the network according to their own preferences on-demand or release audio-visual programs.
The establishment of multimedia communication network for telemedicine has opened up a wide world of application. Hospitals in modern medical centers can provide medical services for patients in distant places through multimedia communication networks. The current telemedicine system includes remote diagnosis, remote consultation, remote consultation, remote surgery and other remote medical services.
Multimedia communication technology is also widely used in the military, the more typical is the C4I system. In the actual C4I system, multimedia technology can be used to record the whole process of combat command, control and analyze the development of the battlefield, digital encryption in order to achieve confidential communication. The application of multimedia technology in the military accelerates the process of army informatization.
Multimedia technology to the publishing industry has brought great impact, electronic publications have a large capacity, small size, low cost, fast retrieval, wide dissemination, easy to save and reproduce, can store audio-visual graphic information, etc., so the electronic publications are becoming more and more popular.
To the mid-1990s of this century, multimedia as a new technology to attract people's attention, a multimedia fever is heating up.
Development of multimedia technology, make full use of multimedia computers, primary and secondary education in various subjects, especially to improve the efficiency of learning, stimulate students' interest in learning is extremely beneficial.
Currently, an emerging discipline - multimedia teaching is being generated. In fact, for many years, people have been eager to receive and process all kinds of information through one of the most self-personal way. Into the 80s of this century, with the rapid development of digital technology, modern communications technology and computer technology, and the resulting birth of multimedia technology ultimately realized this desire of mankind - through multimedia devices, text, sound, images are converted into a computer can deal with the binary language "0", "1" after digitizing the way, data, text, sound and images can be integrated together to deal with the realization of a variety of media information transfer.
1, the characteristics of multimedia teaching Multimedia technology, so that the teaching content of the shape of the sound, diversification of presentation methods, multi-channel stimulation of the student's senses, to carry out situational teaching, thus creating a pleasant, lively and lively teaching atmosphere, is that the students are in a kind of light cuts in the scenario. In this way, to a certain extent, to eliminate the fatigue and tension caused by students listening to the lesson, so that the students' intellectual factors and non-intellectual factors interact to promote, *** with the development: so that students can be in a good state, independent, active learning, so as to achieve better teaching results.
2, suitable for intensive education, conducive to the realization of learning individualization. Multimedia computer video input to the students to provide a completely real photo of the object and its movement process, the teacher can use the "forcing the right prototype" of the repetition, slow play, framing and other special means to make the content of the teaching of the image; through the audio-visual, so that the students observe and perceive in a timely manner, to find the problem, discuss and analyze the learning from shallow to deep, so as to Reinforcement of education. In addition, teachers can also be based on the intellectual status and thinking characteristics of students, the cognitive structure of the class level, learning ability to design teaching software, control the number of times the content of the textbook display, time and order of teaching, teaching, in order to achieve individualized learning.
3. It can provide the conditions to cultivate students' self-learning ability. Modern quality education emphasizes that giving students learning methods is more important than teaching them knowledge itself. He requires teaching to be student-centered, according to the purpose of teaching and students' actuality, constructing problematic situations, designing the teaching process in line with the law of students' self-learning, arranging the necessary exercises, and guiding students to explore independently, in order to gradually improve their self-learning ability. Researchers in the design of multimedia teaching software really follow this principle, this software not only focuses on the wisdom of the education experts, including the details of the teaching content, the scientific nature of the knowledge, the level of explanation, reasoning rigor; and from the basic knowledge, pay attention to the connection between the previous and the previous knowledge, there are quantitative exercises, timely testing and appropriate evaluation, which can stimulate students to learn actively and inspire students to create learning. Positive, enlightened students to create learning thinking, in the training of students' self-learning ability at the same time also improves the students' ability to deal with practical problems. 4, conducive to the implementation of dual teaching, improve teaching efficiency. In traditional teaching, teachers and students are difficult to communicate one by one, and multimedia teaching can fully utilize the interactivity of the computer to implement dual teaching, so that the machine to provide timely and high-quality feedback through the human-computer dialogue, to understand the current status of each student's learning. In the content of the knowledge learned, multimedia teaching can make the abstract into concrete, complex into simple, difficult to easy. Sometimes it is difficult to say with a lot of language problems, through the microcomputer will soon be able to reveal the substance, thus improving the efficiency of teaching.
Second, the development trend of multimedia technology
In general, multimedia technology is developing in two directions:
One is the development trend of networking, and broadband network communications and other technologies combined with each other, so that the multimedia technology into the design of scientific research, business management, office automation, distance learning, telemedicine, retrieval of consulting, culture and entertainment, automation and control of the field;
The second is the development of multimedia technology into the design and development of the multimedia technology into the design and development of the multimedia industry. /p>
The second is the multimedia terminal components, intelligent and embedded, improve the multimedia performance of the computer system itself, the development of intelligent home appliances.
And PC technology in the media program processing has also made great breakthroughs, video and audio streaming capabilities to strengthen the search engine, online TV watching and other technologies accordingly appeared, compared to send and receive E-Mail, chat and video conferencing terminal function is the PC and TV technology is the point of dissolution, and the digital set-top box technology adapted to the development trend of the dissolution of the TV and the PC, extend the The digital set-top box technology adapts to the development trend of TV and PC integration and extends the concept of "information home appliance platform", which makes the multimedia terminals integrate the all-round applications such as home shopping, home office, home medical care, interactive teaching, interactive games, video mails and video-on-demand and so on, and represents the development direction of today's embedded multimedia terminals. Embedded multimedia system can be applied in all aspects of people's life and work, in the field of industrial control and business management, such as intelligent industrial control equipment, POS/ATM machines, IC cards, etc.; in the family field, such as digital set-top boxes, digital TV, WebTV, network refrigerators, network air conditioning and other consumer electronic products, in addition, embedded multimedia system is also in the medical electronic equipment, multimedia cell phones, In addition, embedded multimedia systems also have great application prospects in medical electronic devices, multimedia mobile phones, PDAs, car navigators, entertainment, military and other fields.
Three, on the graphics/image processing technology in multimedia technology
Graphics and image processing technology, including the bitmap image and vector graphics processing content. Graphics processing refers to the computer environment to achieve the representation, detection, drawing, processing, output, etc.; and image processing includes sampling, quantization and coding of non-digitized graphic image information to achieve digitization, and then digital editing and processing of digitized information, compression, storage, transmission, and then decompressing and restoring the image when it needs to be output. One of the digital editing process mainly refers to the image information has been digitized by the specific technical processing, in order to achieve the desired application effect. Commonly used graphics and image processing software are AutoCAD, 3dmax, photoshop and so on.
Graphic image technology is mainly used for plane composition, three-dimensional composition, color composition, web design, computer advertising design, pattern design, multimedia publication design, three-dimensional animation design, computer graphics, image production technology, advertising design and production, computer graphics and so on.
On the development prospects of graphics and imaging technology we can only say that he will become more and more mature, more and more popular. In this colorful world now, people are increasingly pursuing visual feelings, no doubt graphic imaging technology plays an important role here. For graphics and imaging is also a very good professional now, the current state is very encouraging the development of this profession, the market is also in short supply proficient in the international popular graphics / image production tools (such as CorelDraw, Photoshop, Pagemaker, etc.). Employment direction: advertising production companies, architectural design companies, packaging and decoration design companies, home decoration companies, publishing and printing companies.
Four, the significance of multimedia technology learning
Currently, multimedia technology has entered thousands of households, regardless of industry and field, people are concerned about the development of multimedia technology and market changes, and unknowingly joined the ranks of multimedia technology promotion and application. Multimedia technology is changing our way of life and becoming one of the leading technologies in the information society. Mastering one or more of the multimedia technologies will not only benefit us in our daily life, but also our performance of catching up with the trend so that we do not fall behind!
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