Multimedia: Types of media: Linear, Non Linear WWW: World Wide Web maintained & developed by World Wide Web Consortium (W3C) HTTP: Hyper Text Transfer Protocol is stateless request/response protocol protocol Request Format: Response Format: METHOD URI Version Version Status-Code Status-Phrase Additional-Headers Additional-Headers Message-Body Message-Body Ex: GET http://www http://www.goog .google.co le.com m HTTP/1.1 HTTP/1.1 HTTP/1.1 HTTP/1.1 200 OK Server Server HTTP methods: GET/ POST HTML: Hyper Text Markup Language, collection of tags with format
params> DHTML: Dynamic HTML with CSS (Cascading Style Sheet) XML: Extensible Markup Language: full structured language using DTD (Document Type Definition) XSL: XML Style Sheet for XML presentation: it is CSS for XML. XSL parts: XSL Transformations (XSLT), XML Path Language (XPath), XSL Formatting Objects SMIL: Synchronized Multimedia Integration Language for multimedia presentation using markup language. SMIL 2.0: is specified by XML using modularization, Language Profiles. SMIL tags:
, ,,, ,,, Multimedia Components: Text, Image, Video, Audio, Graphics; Color components: Red, Blue, Green (Alpha) Types of Graphics/Image Graphics/Image Representation: 1-bit/binary/monochrome 1-bit/binary/monochrome image: 1 pixel or pel takes 1 bit with 2 colors (black (0), white (1)) 8-bit gray/ bitmap scale image: 1 pixel takes 8 bit bits with 256 colors (0-255), Resolution: number of pixels in image; Aspect ration: ratio between width & height of image Ex: 4:3 Frame buffer: used to store image in hardware. 24-bit image: 1 pixel takes 24 bits with (256)3 colors; but it takes 32 bits as R+G+B (24 bits)+ Alpha (8 bits)=32 8-bit color image: 1 pixel takes 8 bits with 256 selected colors using color histogram, with Color Look up Table. Image file formats: GIF: Graphics Interchange Format by UNISYS with GIF87a, GIF89a versions; GIF Components: GIF signature, Screen Descriptor, Global Color Map, Local Color Map, Image Descriptor, Raster Data, GIF terminator. JPEG: Joint Photographic Experts Group by ISO PNG: NG: Por Portab table Netw Netwo ork Graphi aphics cs;; TIFF TIFF:: Tagg Tagged ed Image mage File File For Format; mat; EXIF EXIF:: Exc Exchang hange e Imag Image e File File;; PS: Post Script PDF: Portable Document Format WMF: Windows Meta File BMP: BitMap Color models for Images: RGB (additive) for CRT displays, CMY ( subtractive color model), CMYK for printers Color models for Videos: YUV for PAL video, YIQ for NTSC or TV broadcasting, YCbCr for digital video. Types of Video signals: (Analog and Digital) Component video: 3 lines(R, G, B), used YUV/ YIQ, no crosstalk, with more bandwidth, good synchronization. Composite Video: 2 lines (Chrominance/Color, Luminance/Intensity), uses YUV/YIQ, for VCRs. Super Video: 2 lines (luminance, composite signal), , more cross talk, low band width. Analog video types: NTSC video: by North America & Japan, with 30 fps, 525 scan lines, 6.0 MHz channel width, 4:3 aspect ratio. PAL Video: Phase Altering Line, by Germans, with 25 fps, 625 scan lines, 8.0 MHz channel width, 4:3 aspect ratio. SECAM video: Systeme Electronique Couleur Couleur Avec Memorie, 25 fps, 625 scan lines, 8.0 MHz channel width, 4:3. Digital Video types: Chroma Subsampling: 4:4:4, 4:2:2, 4:1:1, 4:2:0 CCIR: Consultative Committee for International Radio, versions: CCIR 601, CCIR 601, CIF, QCIF; Digitization: Quantization, Sampling Sample Rate: number of samples per second Nyquest therom: f alias alias=f sampling sampling-f true true or f true true 
