First, the teaching objectives
1. Knowledge and skills: Understand the process of information digitization; Master simple information (text, images, sounds,
Video, etc. ); Stimulate students' interest in learning through cutting-edge information digitization means.
2. Process and method: Through the combination of teaching and demonstration, let students understand the learning content and do it themselves.
Practice, and then master the method of information digitization.
3. Emotion, attitude and values: through learning, we can understand the advantages of information digitization, before information digitization technology.
Follow the knowledge to stimulate students' interest in the course; Improve students' ability to process information.
Second, the content analysis
This section mainly teaches students how to digitize the obtained information, and students focus on the digitization methods of text, image, sound and video. Different types of information can be digitized. Planned class 1 class hour.
Third, student analysis.
Senior high school students learned basic information technology in junior high school and mastered basic computer operation methods. The first chapter also introduces the related knowledge of information. In this section, teachers will demonstrate and students practice learning to use simple information digitization software, so that students can master new operation skills.
Fourth, teaching methods.
Teaching method, demonstration method.
Five, the teaching emphasis and difficulty.
Students not only need to understand the process of information digitization, but more importantly, they can choose appropriate equipment and software to digitize information by analyzing the types of information.
Sixth, teaching AIDS and instruments
Textbooks, multimedia instruments, teaching courseware.
Seven. teaching process
Flowchart:
1. Review the old lesson:
The acquisition of information mainly includes 1. Determine the demand and source of information; 2. The party receiving the information
Types and channels.
2. Import new lessons:
By watching the scene simulation of the water drop football match, this paper puts forward the question: what will spread information?
How to drive?
The information derived from the answer can be spread through electronic devices because the information is counted.
Word processing, and then began a new course of information digitization.
3. Explain in class:
I. Definition of information digitalization
(By analyzing the similarities and differences of the collected information, the definition of digital information is obtained)
1. Digital information: information that can be directly processed by a computer, which we call digital information.
2. Digitization process: using some necessary instruments and equipment, all kinds of non-digital data are collected into physical signals such as sound, light and electricity, and then converted into digital information represented by binary numbers through sampling, quantization and digital coding, and finally stored in a computer.
Second, the advantages of information digitization
(Through examples: U disk saves information, word document search, information release, etc. Summarize the advantages of information digitalization. )
1. Easy to represent and store.
2. Easy to handle and retrieve
3. Easy to spread and integrate
Third, the types of non-digital information.
Pictures, words, videos, sounds.
Fourth, all kinds of information digitization methods
1. Digitization of picture information
(1) Digitization mode: First, digitize the image data (photos, magazine covers, etc.). ) use a scanner.
Stored as a digital image.
Second, digital equipment (digital cameras, mobile phones, tablets, etc.). ) are all obtained by taking pictures.
Digital image.
(2) Digital image types: bitmap, magnification distortion and discrete pixel representation; Vector diagram, amplification will not be distorted,
A series of points connected by lines are calculated by mathematical formulas.
Bitmap: 1. RGB (additive principle of red, green and blue) and CMYK (subtractive principle of cyan, magenta and yellow).
Color indicates introduction.
2. Color depth: color information of each pixel (2 bits, 4 bits, 8 bits, 16 bits, 24 bits).
Wait).
3. Resolution: horizontal pixels * vertical pixels
4. Size calculation: horizontal pixel number * vertical pixel number * color depth /8 (unit byte)
(3) Image format: bmp, jpg, png, gif, etc.
(In the form of homework, let students consult the materials and understand the characteristics of each image format.)
(4) Small expansion of knowledge: introduction of binary image and gray image.
(5) Operation demonstration: simply edit the image and change the format through simple software operation.
(Take making 1 inch and 2-inch photos as examples to demonstrate the actual operation and let students learn simple photo resizing and format conversion. )
2. Digitization of text information
(1) Digitization mode: 1. Keyboard input.
Second, handwriting input, OCR optical character recognition and speech recognition.
(Demonstration with simple mobile phone handwriting input method, speech recognition software and OCR software)
(2) Knowledge expansion: introduction of handwriting board, scanner and pattern recognition technology.
This paper focuses on pattern recognition technology, including words, sounds and images, to stimulate students' interest. )
(3) Student Practice: Use OCR software to convert the prepared materials into words.
3. Digitization of voice information
(1) voice digitization mode: first, send the analog sound source to the computer through the sound card input, and use the sound.
The frequency processing software is converted into a digital audio file.
Secondly, the digital recording pen is used to directly record the live sound and generate a digital audio format file.
(2) Compression format: MP3, WMA, RA, etc.
(3) Knowledge expansion: introduction of sound track. Monophonic, multichannel.
(4) Teacher demonstration: By mixing and cutting the prepared music materials, the processed music will be displayed to the students.
4. Digitization of video information
The combination of image, text and voice leads to the digitization of video information.
(1) Digitization of video information: First, the video acquisition card inputs the analog video obtained by the video signal source into.
Line capture and conversion bit digital signal;
Second, digital cameras and other devices directly generate digital video.
(2) video formats: AVI, MPEG, FLV, WMV.
(Ask students to consult the materials and find out the characteristics of each format by homework)
(3) Teacher's demonstration: The video material is converted into a format by demonstrating the format factory software.
Verb (abbreviation for verb) is free to practice.
Students practice digitizing the materials prepared by the teacher, and the teacher gives corresponding instructions on the computer.