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The document discusses digital media such as audio, images, and video. It explains that these media are stored as files with different extensions, like BMP, JPG, PNG for images and WAV, MP3 for audio. It describes how media is captured using devices like cameras and microphones, and how the continuous analog signals are converted to discrete digital formats through sampling and digitization. Key concepts covered include the Nyquist sampling theorem, bit depth, color spaces, and gamma correction.
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Multimedia Object - Audio
The document discusses MPEG audio compression standards. It provides details on MPEG-1 audio layers including:
- MPEG-1 audio layers 1, 2, and 3 have increasing complexity and performance with layers 1 being the simplest and layers 3 providing the best quality.
- All layers use a filterbank and quantization while layer 3 adds an MDCT transform and improved quantization.
- Layers are decoded using frame unpacking, reconstruction, and inverse mapping processes.
- Frames contain header, allocation, and sample data with headers being more error resistant.
Image processing
This document discusses digital image processing using MATLAB. It begins by defining digital images and how they are represented by arrays of pixels in computer memory. It then discusses how images can be read into MATLAB and converted between color, grayscale, and binary representations. Various image processing operations are described such as morphology, edge detection, dilation, filling, and filtering. Region properties like centroids and bounding boxes are also extracted. Finally, intensity adjustments on RGB images using imadjust are demonstrated.
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7. evalution of interactive system
The document discusses different methods for evaluating interactive systems, including both a priori and experimental evaluations. A priori evaluations include heuristic evaluations, where experts review systems according to usability guidelines, and predictive models like Fitts' law. Experimental evaluations involve usability testing with users, and can be done in laboratories or field studies. Both objective metrics and subjective user feedback are important in evaluation.
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5. ergonomic of www interface
The document discusses various ergonomic considerations for designing effective web interfaces. It notes that 62% of buyers give up during online transactions and 40% of consumers do not return to websites where their first visit failed. Good web design with usability testing is important. The document outlines recommendations for targeting intended users, structuring content through card sorting, enabling easy navigation, organizing web pages, designing effective forms, and considerations for intranet design.
4. ergonomic of wimp interface
The document discusses various aspects of graphical user interface (GUI) design including windows, widgets, icons, menus, pointers, and other WIMP objects. It provides recommendations for designing these elements according to ergonomic principles like direct manipulation, feedback, organization, identification, task analysis, and order of representation. Examples are given of different interface styles, window opening/closing strategies, multi-window approaches, menu structures, and mouse button assignments.
Multimedia outline
This document provides an overview of topics to be covered in a multimedia course including lossless and lossy image and audio compression techniques, standards like JPEG and MPEG, image and audio processing, video compression, multimedia interfaces, content retrieval over networks, and references for further reading on fundamentals of multimedia, data compression, digital image processing, JPEG, MPEG video compression, audio and video networking protocols, and more.
Introduction
Developing successful multimedia systems is challenging as it involves integrating different media types into a coherent framework. Continuous media like video require large storage and bandwidth while automatic analysis of audio, image and video content is difficult. Multimedia computing draws from many areas and requires complex algorithms and efficient hardware. Example multimedia systems at MIT's Project Athena included applications for real estate, navigation, learning and photos sharing. Key techniques in multimedia include data compression, processing and analysis, delivery over networks, and database indexing and retrieval.
Concept ofinternet web_f2010211
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Lec2
- 1. Digital Audio, Image and Video Sethserey SAM Computer Science Department
- 4. An image contains a header and a bunch of (integer) numbers.
- 7. Sampling for an Audio Signal Sampling period Ts, fs =1/Ts Signal Period T, f = 1/T Intuitively T should >= 2Ts
- 8. fs = 2.5f fs = 1.67f Original signal A new component is added This is denoted as aliasing.
- 9. fs = 2f There are infinite number of possible sin waves going through the sampling points
- 13. The image of Barbara
- 14. Aliasing due to sampling
- 17. Digital Images An image contains 2D samples of a surface, which can be represented as matrices. Each sample in an image is called a pixel.
- 20. Bit Plane [ b7 b6 b5 b4 b3 b2 b1 b0] MSB LSB Each bit plane is a binary image.
- 23. Color Image r g b There are other color spaces Like YUV, HSV etc. 24 bit image
- 24. Color Table Image with 256 colors r g b Clusters of colors It is possible to use much less colors To represent a color image without much degradation.
- 25. Human Vision Human eye has two kinds of light sensitive cells. The rods and The cones. Rods response curve (black and white vision) Cones response curve (color vision) R = s E( ) S r ( )d G = s E( ) S g ( )d B = s E( ) S b ( )d
- 29. Gamma Correction Linearly increasing intensity Without gamma correction Linearly increasing intensity with gamma correction
- 31. Digital Video Frame N-1 Frame 0 time Digital video is digitized version of a 3D function f(x,y,t)