Raster scan and random scan display ppt on tv

© 2005 Pearson Education Chapter2 Overview of Graphics Systems.

Display principle –Raster Scan Display Principle –Random Scan Display Principle © 2005 Pearson Education CRT Display Principles Raster-Scan Displays –Based on TV technology Electron beam swept across screen one row at a time from top to bottom Each row is referred to as a scan line © 2005 Pearson Education CRT Display Principles Raster-Scan Displays/ vs. wired –headset Traditional Input Device (4/4) Digital still and video cameras, scanners MIDI devices –input from electronic musical instruments –more/


Computer Graphics Chapter 2 Graphics Systems Andreas Savva.

the 1920s, motion picture film rates increased to 24 frames per second removing flickering. – Today TV refresh rate is 25 frames per second in Europe and 30 frames per second in the USA. 16 The depth (or intensity) of the frame /handling approximately 100,000 lines at this refresh rate. They are designed for line drawing applications and cannot display realistic shaded images. 23 Raster Scan Vs Random Scan Random scan Raster scan Ideal line drawing 24 The Bit-map The Bit-map 1-bit-deep frame-buffer 11111100 /


Blanking Interval https://store.theartofservice.com/the-blanking-interval-toolkit.html.

data that is transmitted during the blanking intervals of the TV signal and extracts the random seed value needed for controlling the random number generation https://store.theartofservice.com/the-blanking-interval-/and before drawing the next line) https://store.theartofservice.com/the-blanking-interval-toolkit.html Horizontal blanking interval 1 Horizontal blanking interval refers to a part of the process of displaying images on a computer monitor or television display device|screen via raster scanning/


Graphics Device System

X,Y with vertical/horizontal plate voltage Often used intensity as Z Vector Display Architecture Display Technologies: CRTs Raster Displays Black and white television: an oscilloscope with a fixed scan pattern: left to right, top to bottom Paint entire screen 30 times/sec Actually, TVs paint top-to-bottom 60 times/sec, alternating between even and odd scanlines This is called interlacing. It’s a hack. To paint/


1 In the name of God Computer Graphics. 2 Image Mathematical Model Image Analysis (pattern recognition) Image Synthesis (Rendering) ModelingImage processing.

-map) Pixel = Picture element Raster-Scan Display 27 A raster-scan system displays an object as a set of points across each screen scan line (a)(b) (d)(c) 28 1 2 3 4 5 6 7 8 Interlacing 29 Liquid crystal displays Smaller, lighter, and … no radiation problems. Found on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones How/


1 Graphics Device System. 2 Acknowledgement I’d like to thank Pradondet Nilagupta who creates such a good work on these lecture notes.

/Slide11.html Name two disadvantages Just does wireframe Display needs constant update to avoid fading 30 Vector Display Architecture 31 Display Technologies: CRTs Raster Displays Black and white television: an oscilloscope with a fixed scan pattern: left to right, top to bottom Paint entire screen 30 times/sec Actually, TVs paint top-to-bottom 60 times/sec, alternating between even and odd scanlines This is called interlacing. It’s/


Computer Graphics Chapter 2 Graphics Systems. 2 Development of Hardware Hardware evolution had a greater influence in the development of Computer Graphics.

the 1920s, motion picture film rates increased to 24 frames per second removing flickering. – Today TV refresh rate is 25 frames per second in Europe and 30 frames per second in the USA. 15 The depth (or intensity) of the frame /handling approximately 100,000 lines at this refresh rate. They are designed for line drawing applications and cannot display realistic shaded images. 19 Raster Scan Vs Random Scan Random scan Raster scan Ideal line drawing 20 The Bit-map The Bit-map 1-bit-deep frame-buffer 11111100 /


1 Graphics Device System Pradondet Nilagupta. 2 Graphical System 5 major elements for a computer graphic system Processor Memory Frame buffer Input devices.

/Slide11.html Name two disadvantages Just does wireframe Display needs constant update to avoid fading 23 Vector Display Architecture 24 Display Technologies: CRTs Raster Displays Black and white television: an oscilloscope with a fixed scan pattern: left to right, top to bottom Paint entire screen 30 times/sec Actually, TVs paint top-to-bottom 60 times/sec, alternating between even and odd scanlines This is called interlacing. It’s/


CS 450: Computer Graphics INTRODUCTION TO COMPUTER GRAPHICS

displays Raster-scan displays CRT: VECTOR DISPLAYS Also called random-scan, stroke-writing, or calligraphic displays Electron beam actually draws points, lines, and curves directly List of things to draw stored in display list (also called refresh display file, vector file, or display program/color looks right Advantages: Glasses are lightweight Image is brighter than active 3D Disadvantages: Need special TV Only seeing HALF the vertical resolution! Left: Passive 3D through glasses - Middle: Passive 3D /


CGMB214: Intro. To Computer Graphics

prevent flicker Cathode Ray Tube (CRT) Two ways of beam been shot at the screen Raster-Scan Random-Scan Cathode Ray Tube (CRT) Raster-Scan Display Based on TV technology The electron beam is swept across the screen one row at a time, from / cycling through the display list drawing one line at a time Random-scan also known as vector display or stroke-writing display or calligraphic displays Electron beam is focussed only where lines need to be drawn Higher resolution than raster-scan and draw a smoother line/


I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam September 7, 2004 Introduction 1/56 Introduction.

C S Andries van Dam September 7, 2004 Introduction 41/56 Display Hardware: Raster scan vs. random scan Drawing primitives by scan conversion –lines –polygons –circles and ellipses –characters –attributes (color, line style, fill pattern…) Clipping to clip rectangle:/van Dam September 7, 2004 Introduction 42/56 Vector (calligraphic, stroke, random-scan) –still used in some plotters Raster (TV, bitmap, pixmap), used in displays and laser printers Graphics Display Hardware I N T R O D U C T I O /


Computer Graphics- SCC 342

– pixel or dot per inch 2.1 Video Display Devices Raster-Scan Pattern: Horizontal scan rate: # scan lines per second Interlaced (TV) vs. non-interlaced displays 2.1 Video Display Devices Random-Scan Display Also called Vector-scan display Pictures are generated as line drawings 2.1 Video Display Devices Flat-Panel Display A class of video devices that have reduced volume, weight and power Two categories: Emissive displays: convert electrical energy to light (e.g. Plasma/


MULTIMEDIA COMPRESSION TECHNIQUES. UNIT I INTRODUCTION.

and 525 (interlaced) scan lines per frame at 30 fps. Figure 5.4 shows the effect of “vertical retrace and sync” and “horizontal retrace and sync” on the NTSC video raster. What is Raster Graphics? 42 a raster graphics image is a dot matrix data structure representing a generally rectangular grid of pixels, or points of color, viewable via a monitor, paper, or other display medium. A raster/ thrust of High-Definition TV (HDTV) is not/ Conditional entropy Example: two random variables X and Y X : College major/


Computer Graphics By : Pcti Group

Random Scan System A Random scan system draws the Component lines of an object in any order Specified. Presentation Title | March 25, 2017 | Presentation Title | March 25, 2017 | Raster Scan System A Raster Scan system displays an Object as a set of discrete points Across each scan lines. Presentation Title | March 25, 2017 | Presentation Title | March 25, 2017 | Interlacing In Some raster scan Systems(TV/Graphics. Overview of Display Devices. Monitors Tubes CRT’s Random and Raster Scan Presentation Title | /


Graphics Device Principles B.Sc. (Hons) Multimedia ComputingMedia Technologies.

Technologies Vector Displays (Random Scan) Raster Displays (Raster Scan) Vector Scan Displays Vector Displays Often referred to as Random Scan Devices, stroke- writing or calligraphic displays Picture definition stored as a set of line drawing commands Draws each component line in turn Originally designed for architectural and engineering layouts High resolutions with smooth point-to-point line drawing functions Not able to display photo-realistic images Raster Scan Displays Based on TV Technology Electron/


Graphics System Overview Kulraj Singh IP university.

random path, a so- called vector scan. Raster displays (TVs etc) drive the beam in a regular pattern called a raster scan. Vector displays are almost extinct. Scan conversion: convert geometric primitives from vector scan descriptions (endpoints etc.) to raster scan/ Package Graphics Library such as Core, OpenGL, DirectX Provide primitives for graphic description Build and maintain graphic representation models Provide primitives for viewing operations Support user interaction with application program /


I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam September 4, 2008 Introduction 1/59 Introduction.

Introduction 44/59 2D Hardware/Algorithms Outline Display Hardware: Raster scan vs. random scan Drawing primitives by scan conversion –Lines, polygons, circles and ellipses, characters, attributes (color, line style, fill pattern…) / Introduction 45/59 Graphics Display Hardware Vector (calligraphic, stroke, random-scan) –still used in some plotters Raster (TV, bitmap, pixmap), used in displays and laser printers Ideal Drawing Vector Drawing Raster Outline primitives Filled primitives I/


Graphics System Overview Sang Il Park Sejong University Most of the slides are taken from Jehee Lee’s.

random path, a so- called vector scan. Raster displays (TVs etc) drive the beam in a regular pattern called a raster scan. Vector displays are almost extinct. Scan conversion: convert geometric primitives from vector scan descriptions (endpoints etc.) to raster scan/ Package Graphics Library such as Core, OpenGL, DirectX Provide primitives for graphic description Build and maintain graphic representation models Provide primitives for viewing operations Support user interaction with application program /


University College Dublin1 Output devices COMP 3003.

College Dublin9 Vector (Random) Scan System (cont) u Advantages are high resolution, easy animation, and requires little memory (just display program), e.g: u Disadvantages are limited colour capability and flicker occurs as complexity of image increases. b a Turn e beam off, move to a. Turn e beam on and draw to b. Repeat move draw sequence. University College Dublin10 Raster Scan Devices u Scans the screen from/


Introduction CS423: Computer Graphics Still from Pixar’s Inside Out, 2015.

operations into ‘cloud’, get back results, don’t care how  Rendering even available as internet service! Enabling Modern Computer Graphics (5/5) 10 Vector (calligraphic, stroke, random-scan) Raster (TV, bitmap, pixmap) used in displays and laser printers  Driven by display commands  (move (x, y), char(“A”), line(x, y)…)  Survives as “scalable vector graphics”  Driven by array of pixels (no semantics, lowest form of representation)  Note/


Images/Graphics Vector GraphicsVSRaster Graphics –1. Vector Graphics –mathematically expressed shapes –compositions of basic shapes: rects, polygons –always.

raster –Often create by vector graphics –and scan-convert to raster graphics (pixmap) –eg for animation frames –but need to go back to vector model –for another view etc. –raster ==> vector –more difficult –need computer vision –line detectors etc. 3D Apps. vector ==> raster –Often create by vector graphics –and scan-convert to raster/2. Screen Grab from displayed image (eg PSP) 3. Capture and digitise real image –/ graphics Animation Frame Rate –Movie24 fps –tv video30 fps –animation>15 fps –Techniques /


Rajamangala Institute of Technology 1 Computer Graphics Hardware Input/Output Technologies.

Rajamangala Institute of Technology 10 Vector Display Devices A.K.A. Vector Scan Displays, Random Scan Devices, Line Plotters The electron /and shapes. Example: postscript files (PS/EPS) To display on a RASTER device the graphic needs to be rasterized Rajamangala Institute of Technology 13 Raster Graphics An image made up of many small regularly placed cells (pixels) Stored as an array of numerical values commonly called a pixelmap (or bitmap) Rajamangala Institute of Technology 14 Raster Scan Devices Scans/


C O M P U T E R G R A P H I C S Guoying Zhao 1 / 46 C O M P U T E R G R A P H I C S Guoying Zhao 1 / 46 Computer Graphics Introduction II.

O M P U T E R G R A P H I C S Guoying Zhao 38 / 46 Graphics Display Hardware Vector (calligraphic, stroke, random-scan) –still used in some plotters Raster (TV, bitmap, pixmap), used in displays and laser printers Ideal Drawing Vector Drawing Raster Outline primitives Filled primitives C O M P U T E R G R A P H I C S Guoying/


MULTIMEDIA TECHNOLOGIES. What is Multimedia ?? Multimedia is the field concerned with the computer-controlled integration of text, graphics, drawings,

and graphics (and some images) are mainly generated directly by computer/device (e.g. drawing/painting programs) and do not require digitizing: They are generated directly in some (usually binary) format. Printed text and some handwritten text can be scanned/and storing digital images. Image files are composed of either pixel or vector (geometric) data that are rasterized to pixels when displayed (with few exceptions) in a vector graphic display/ (on-line video, Internet TV) with low bandwidths. Because of/


Computer Graphics- SCC 342 Chapter 2: Overview of Graphics Systems Chapter 3: Graphics Output Primitives.

Raster-Scan Pattern:  Horizontal scan rate: # scan lines per second  Interlaced (TV) vs. non-interlaced displays 11 2.1 Video Display Devices Random-Scan Display  Also called Vector-scan display  Pictures are generated as line drawings 12 2.2 Raster-Scan Systems  Simple raster-graphics system  Video controller (display processor) controls operations of display device. 13  Raster/ Algorithm  The midpoint circle algorithm has been developed and patented by J. Bresenham  Characteristics of MPCA /


1.  The primary output device in a graphics system is a video monitor. These monitors are based on Cathode Ray Tube (CRT) design.  CRT is a vacuum tube/electron.

are used in TV monitors, laptops, calculators, video games, etc. 20  Plasma Panel displays  Thin-film electroluminescent displays  Light emitting diode (LED)  Liquid Crystal Device (LCD) 21 22  Also called gas discharge displays.  It consist/display file to display a picture.  Refresh rate in random scan systems is 30 to 40 times per second. 30 Raster Scan  It is a point plotting device.  It sweeps in a particular order.  It is well suited for realistic display of scenes containing shading and/


—————————————————————————————————————————— Design of Interactive Computational Media Jan.-Apr. 2003 ©1992-2003, Ronald M. Baecker Slide 7.1 The Design.

Random scan: “Connect the dots” Raster scan: “Like a TV” —————————————————————————————————————————— Design of Interactive Computational Media Jan.-Apr. 2003 ©1992-2003, Ronald M. Baecker Slide 7.15 Generating the image Non-interlaced raster scan display (left), interlaced raster scan display (right), random scan display/, or ENTER required? –Single token responses only, or arguments too? Menu display and organization –Menu items displayed as words or pictographs (icons)? –Menu pages simple, pull-down, pop-up/


—————————————————————————————————————————— Design of Interactive Computational Media Sep.-Dec. 2002 ©1992-2002, Ronald M. Baecker Slide 7.1 The Design.

Random scan: “Connect the dots” Raster scan: “Like a TV” —————————————————————————————————————————— Design of Interactive Computational Media Sep.-Dec. 2002 ©1992-2002, Ronald M. Baecker Slide 7.15 Generating the image Non-interlaced raster scan display (left), interlaced raster scan display (right), random scan display/, or ENTER required? –Single token responses only, or arguments too? Menu display and organization –Menu items displayed as words or pictographs (icons)? –Menu pages simple, pull-down, pop-up/


REVIEW LECTURE By Austin Troy

and a number of branches or subdivisions. Problem: linkages in the tables must be known before Groovy 70s TV/way to display point data/consist of systematic and random sources of distortion Radiometric correction:/Scanning Encodes a digital raster image of some surface Three types of scanner: Flat bed: Drum Continuous feed Introduction to GIS Digitizing Head’s up—on screen Tablet digitizing XII. Network analysis: Won’t be on the test Introduction to GIS XII. Network analysis: Won’t be on the test XIII. Projections and/


In the name of God Computer Graphics. Today Introduction Sampling Graphic Output Primitives 1.Line 2.Circle 3.Curve 4.polygon.

a set of discrete integer positions. The line color is loaded into the frame buffer at the corresponding pixel coordinates. Graphic Hardware Display Vector (random-scan) – still used in some plotters Raster (TV, bitmap), used in displays and laser printers Outline primitives Filed primitives 2D Raster Architecture Raster display stores bitmap in refresh buffer, also known as bitmap, frame buffer; can be in separate hardware (VRAM) or in CPU’s/


Chapter 4 -- Graphics Hardware1 Graphics Hardware Chapter 4.

F Hence, these printers are raster output devices, requiring scan conversion of vector images prior to printing. Chapter 4 -- Graphics Hardware10 u Pen Plotters: F moves the pen over the paper in a random, vector- drawing style. / 3. Raster-Scan Display Systems n The basic concepts of raster graphics systems were presented in Chapter1, and Chapter 2 provided further insight into the types of operations possible with a raster display. n This section discusses the various elements of a raster display. Chapter /


Java ThreadsGraphics Programming Graphics Programming: Graphics Devices.

refresh rates. Vector Displays Often referred to as Random Scan Devices, stroke- writing or calligraphic displays Picture definition stored as a set of line drawing commands Draws each component line in turn Originally designed for architectural and engineering layouts High resolutions with smooth point-to-point line drawing functions Not able to display photo-realistic images Vector Displays Raster Scan Displays Based on TV Technology Electron beam sweeps scan lines row by/


University of British Columbia CPSC 314 Computer Graphics Jan-Apr 2007 Tamara Munzner Final Review Week 13,

and red lighter than blue Q I 61 Review: Color Constancy automatic “white balance” from change in illumination vast amount of processing behind the scenes! colorimetry vs. perception 62 Review: Scan Conversion convert continuous rendering primitives into discrete fragments/pixels given vertices in DCS, fill in the pixels display/) } Bresenham’s Line Rasterization Algorithm use error term, /randomly displace scale variance by half 2D: diamond-square generate new value at midpoint average corner values + random/


University of British Columbia CPSC 314 Computer Graphics Jan-Apr 2007 Tamara Munzner Final Review Week 13,

and red lighter than blue Q I 61 Review: Color Constancy automatic “white balance” from change in illumination vast amount of processing behind the scenes! colorimetry vs. perception 62 Review: Scan Conversion convert continuous rendering primitives into discrete fragments/pixels given vertices in DCS, fill in the pixels display/) } Bresenham’s Line Rasterization Algorithm use error term, /randomly displace scale variance by half 2D: diamond-square generate new value at midpoint average corner values + random/


Computer Graphics CC416 Lecture 01: Introduction Dr. Manal Helal – Fall 2014.

Visualization Protein Structure aerodynamics flow Computer Art Fractals Entertainment Education and Training Image Processing Enhancement Feature detection Graphical User Interface Graphics Systems Video Display Devices Raster- Scan Systems Random Scan Systems Input Devices Hard Copy Devices Graphics Software Video Display Devices –Cathode Ray Tube (CRT) & Raster scan display Raster Scan Display Flat panel Display Plasma panels –The cells are sandwiched between x- and y-axis panel –Each pixel is made up of/


Chapter 2 the computer. The Computer a computer system is made up of various elements each of these elements affects the interaction –input devices –

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


Chapter 2 the computer. The Computer a computer system is made up of various elements each of these elements affects the interaction –input devices –

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


Graphics Device Principles B.Sc. (Hons) Multimedia ComputingMedia Technologies.

refresh rates. Vector Displays Often referred to as Random Scan Devices, stroke- writing or calligraphic displays Picture definition stored as a set of line drawing commands Draws each component line in turn Originally designed for architectural and engineering layouts High resolutions with smooth point-to-point line drawing functions Not able to display photo-realistic images Raster Scan Raster Scan Displays Based on TV Technology Electron beam sweeps scan lines row by row/


CAP4730: Computational Structures in Computer Graphics Overview of Graphics Systems Chapter 1.

Position relative Vector display system - graphical output system that was based on strokes (as opposed to pixels). Also known as: random, calligraphic, or stroke displays. Representing Objects/now we want to show it. Read Ch. 2 in the Hearn and Baker handout. Hardcopy Display –Vector –Raster Scan InputOutputComputation Hardcopy Printers (Resolution, color depth) –Dot Matrix - uses / frames are drawn per second. Eye can see 24 frames per second. TV is 30 Hz, monitors are at least 60 Hz. Beam Movement Refresh /


Chapter 1 the human. Information i/o … – visual, auditory, haptic, movement Information stored in memory – sensory, short-term, long-term Information.

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … – Top plate transparent and polarised, bottom plate reflecting. – Light passes through top plate and crystal, and reflects back to eye. – Voltage applied to crystal changes polarisation and hence colour – N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


CSC 461: Lecture 1 1 Lecture 1: Introduction Objectives Explore what computer graphics is about Survey some application areas Introduce a history of computer.

6 Cathode-Ray Tube (CRT) – most PCs Calligraphic CRT – line-drawing device, random scan, electron beam emits from any position to any position Raster mode CRT – display the contents of the frame buffer at a rate high enough to avoid flicker Screen / Lecture 1 12 Display Processor Rather than have host computer try to refresh display use a special purpose computer called a display processor (DPU) Graphics stored in display list (display file) on display processor Host compiles display list and sends to DPU /


UNIT I 2D PRIMITIVES INTRODUCTION 1 SNSCE/IT/ARUNA.

of khan SNSCE/IT/ARUNA 18 Computer generated Scene KNICKKNACK Red’s dream TV series SNSCE/IT/ARUNA 19 graphics combined with a live scene SNSCE/IT/ARUNA 20 reconstruction of thirteenth /Raster-Scan Displays SNSCE/IT/ARUNA 30 Random-Scan Displays SNSCE/IT/ARUNA 31 Color CRT Monitors Flat-Panel Displays SNSCE/IT/ARUNA 32 Liquid crystal displays (LCD) Plasma panels Electroluminescent panels (ELD) Light-emitting diode display (LED) SNSCE/IT/ARUNA 33 Three-Dimensional Viewing Devices SNSCE/IT/ARUNA 34 Stereoscopic and/


BZUPAGES.COM chapter 2 the computer. BZUPAGES.COM The Computer a computer system is made up of various elements each of these elements affects the interaction.

PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain BZUPAGES.COM special displays Random Scan (Directed/


Chapter 2 the computer. The Computer a computer system is made up of various elements each of these elements affects the interaction –input devices –

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


Chapter 2 the computer. The Computer a computer system is made up of various elements each of these elements affects the interaction –input devices –

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


Chapter 1 the human. Information i/o … – visual, auditory, haptic, movement Information stored in memory – sensory, short-term, long-term Information.

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … – Top plate transparent and polarised, bottom plate reflecting. – Light passes through top plate and crystal, and reflects back to eye. – Voltage applied to crystal changes polarisation and hence colour – N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


Chapter 2 the computer. The Computer a computer system is made up of various elements each of these elements affects the interaction –input devices –

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


The Third Meeting THE COMPUTER. The Computer a computer system is made up of various elements each of these elements affects the interaction –input devices.

on PDAs, portables and notebooks, … and increasingly on desktop and even for home TV also used in dedicted displays: digital watches, mobile phones, HiFi controls How it works … –Top plate transparent and polarised, bottom plate reflecting. –Light passes through top plate and crystal, and reflects back to eye. –Voltage applied to crystal changes polarisation and hence colour –N.B. light reflected not emitted => less eye strain special displays Random Scan (Directed-beam/


Digital Halftoning What is Digital halftoning History Goals of halftoning Methods of halftoning.

is the technique used to display an image with a few/different directions –Tone jumps –Detail rendition suffers –Scan quality suffers Rosette pattern When preparing color separations/TV picture "snow". Though the image produced is very inaccurate and noisy, it is free from "artifacts" which are phenomena produced by digital signal processing. Many techniques exist for the reduction of digital artifacts like these, most of which involve using a little randomness to perturb a regular algorithm a little. Random/


University of Canberra Advanced Communications Topics

as we know it today Aspect ratio First TV displays were Round Rectangular Rasters easier to Generate Television Developed using a 4:/TV companies and see if they are making any money? All Current Generation PCs use Progressive Do You Use A PC? All Current Generation PCs use Progressive Scan and display Pictures which match or exceed HDTV resolutions although the pixel pitch, aspect ratio and/, called the "I pictures", is to serve as random access points to the sequence. P Frames P Forward Prediction P /


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