This document provides an overview of computer graphics hardware and software. It discusses what computer graphics are, common applications like movies, games and scientific visualization, and hardware like CRT, LCD and plasma displays. It also covers computer graphics software topics such as rendering primitives, algorithms for transformations and rasterization, and application programming interfaces. The graphics rendering pipeline that converts 3D scenes to 2D images is also summarized.
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This presentation will introduce you to Raster details in computer graphics.
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Do Not just learn computer graphics an close your computer tab and go away..
APPLY them in real business,
Visit Daroko blog for real IT skills applications,androind, Computer graphics,Networking,Programming,IT jobs Types, IT news and applications,blogging,Builing a website, IT companies and how you can form yours, Technology news and very many More IT related subject.
-simply google:Daroko blog(professionalbloggertricks.com)
• Daroko blog (www.professionalbloggertricks.com)
• Presentation by Daroko blog, to see More tutorials more than this one here, Daroko blog has all tutorials related with IT course, simply visit the site by simply Entering the phrase Daroko blog (www.professionalbloggertricks.com) to search engines such as Google or yahoo!, learn some Blogging, affiliate marketing ,and ways of making Money with the computer graphic Applications(it is useless to learn all these tutorials when you can apply them as a student you know),also learn where you can apply all IT skills in a real Business Environment after learning Graphics another computer realate courses.ly
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Computer graphics are pictures and movies created using computers - usually referring to image data created by a computer specifically with help from specialized graphical hardware and software. It is a vast and recent area in computer science. The phrase was coined by computer graphics researchers Verne Hudson and William Fetter of Boeing in 1960. Another name for the field is computer-generated imagery, or simply CGI.
Do Not just learn computer graphics an close your computer tab and go away..
APPLY them in real business,
Visit Daroko blog for real IT skills applications,androind, Computer graphics,Networking,Programming,IT jobs Types, IT news and applications,blogging,Builing a website, IT companies and how you can form yours, Technology news and very many More IT related subject.
-simply google:Daroko blog(professionalbloggertricks.com)
• Daroko blog (www.professionalbloggertricks.com)
• Presentation by Daroko blog, to see More tutorials more than this one here, Daroko blog has all tutorials related with IT course, simply visit the site by simply Entering the phrase Daroko blog (www.professionalbloggertricks.com) to search engines such as Google or yahoo!, learn some Blogging, affiliate marketing ,and ways of making Money with the computer graphic Applications(it is useless to learn all these tutorials when you can apply them as a student you know),also learn where you can apply all IT skills in a real Business Environment after learning Graphics another computer realate courses.ly
• Be practically real, not just academic reader
• Daroko blog (www.professionalbloggertricks.com)
• Presentation by Daroko blog, to see More tutorials more than this one here, Daroko blog has all tutorials related with IT course, simply visit the site by simply Entering the phrase Daroko blog (www.professionalbloggertricks.com) to search engines such as Google or yahoo!, learn some Blogging, affiliate marketing ,and ways of making Money with the computer graphic Applications(it is useless to learn all these tutorials when you can apply them as a student you know),also learn where you can apply all IT skills in a real Business Environment after learning Graphics another computer realate courses.ly
• Be practically real, not just academic reader
This presentation will introduce you to Raster details in computer graphics.
---------------------------------------------------------------------------
Do Not just learn computer graphics an close your computer tab and go away..
APPLY them in real business,
Visit Daroko blog for real IT skills applications,androind, Computer graphics,Networking,Programming,IT jobs Types, IT news and applications,blogging,Builing a website, IT companies and how you can form yours, Technology news and very many More IT related subject.
-simply google:Daroko blog(professionalbloggertricks.com)
• Daroko blog (www.professionalbloggertricks.com)
• Presentation by Daroko blog, to see More tutorials more than this one here, Daroko blog has all tutorials related with IT course, simply visit the site by simply Entering the phrase Daroko blog (www.professionalbloggertricks.com) to search engines such as Google or yahoo!, learn some Blogging, affiliate marketing ,and ways of making Money with the computer graphic Applications(it is useless to learn all these tutorials when you can apply them as a student you know),also learn where you can apply all IT skills in a real Business Environment after learning Graphics another computer realate courses.ly
• Be practically real, not just academic reader
Computer graphics are pictures and movies created using computers - usually referring to image data created by a computer specifically with help from specialized graphical hardware and software. It is a vast and recent area in computer science. The phrase was coined by computer graphics researchers Verne Hudson and William Fetter of Boeing in 1960. Another name for the field is computer-generated imagery, or simply CGI.
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: Introduction of Rendering, Raytracing, Antialiasing, Fractals
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2. What is Computer
Graphics?
● Different things in different contexts:
– pictures, scenes that are generated by a
computer.
– tools used to make such pictures, software and
hardware, input/output devices.
– the whole field of study that involves these tools
and the pictures they produce.
● Use of computer to define, store, manipulate,
interrogate and present pictorial output.
3. ● How pictures are represented in computer
graphics?
● How pictures are prepared for presentation?
● How interaction within the picture is
accomplished?
4. Computer Graphics
Applications
● Art, entertainment, and publishing
– movie production, animation, special effects
– computer games
– World Wide Web
– Book, magazine design, photo editing
● CG and Image processing (syntesis vs.
analysis)
● Simulations (education, training)
● CAD architectural, circuit design etc.
● Scientific analysis and visualization
● Graphical User Interfaces
5. Display (Video
Display Device)
● Most CG on video monitors
● Still most popular: Cathode Ray Tube (CRT)
● Other popular display types:
– Liquid Crystal Display
– Plasma display
– Field Emission Displays
– Digital Meromirror Devices
– Light Emitting Diodes
– 3D display devices (hologram or page scan
methods)
6. 1. cathode rays
emitted by the
electron gun
CRT
2. focusing and
deflection
3. when electron
beams contact
screen phosphor
emits light
4. light fades,
redraw required
in a small period
(refresh)
7. CRT types
● Direct View Storage Tubes (not CRT, no need
for refresh, pictures stored as a permanent
charge on phosphor screen)
● Calligraphic refresh CRT (line drawing or
vector random scan, need refreshing)
● Raster-scan (point by point refreshing)
● Refresh rate: # of complete images
(frames) drawn on the screen in 1 second.
Frames/sec.
● Frame time: reciprocal of the refresh rate,
time between each complete scan. sec/frame
8. Vector Scan
● Picture definition is stored as a set of line-drawing
commands in a refresh buffer.
● to display a picture, the system cycles
through the set of commands in the buffer
● Designed for line drawing applications (CAD)
9. Raster Scan
● Screen is a regular grid of samples called
pixels (picture element)
● Screen is refreshed line by line
non-interlaced interlaced, cycle 1 interlaced, cycle 2 interlaced, 2 cycles
● Interlacing: Avoid flickering affect for small
refresh rates.
interlaced 50Hz: actually 25Hz
10. ● resolution: a 2D term that measures the
number of scan-lines and the number of
pixels on each line (maximum number of
points that can be displayed without overlap
on a CRT)
● black and white display only binary pixels.
● intensity of a pixel can be achieved by the
force of electron beam (gray scale)
● color display?
11. Color Displays
● Beam penetration method:
special phosphors emitting different colors for
different intensity of electron. Slow, limited colors.
● Shadow mask method:
3 electron guns + a shadow mask grid. Intensities of
3 colors result in an arbitrary color pixel. (most TVs
and monitors)
12. ● black and white: 1 bit per pixel.
● gray scale: 1 byte per pixel (256 gray levels)
● true color: 3 bytes=24pits per pixel (224
colors)
● indexed color frame buffer: each pixel uses 1
byte, an index entry in a colormap table
matching the color to the actual color.
13. Vector vs Raster Scan
● raster scan monitors:
– inexpensive
– filled areas, patterns
– refresh process is independent (constant for any
complex scene)
● vector scan monitors:
– Smooth lines. no need for scan conversion: lines
to pixels. (raster scan solution antialiasing)
– sometimes memory and CPU efficient 1000 lines:
Vector scan: 2000 endpoints and 1000 operations
Raster scan: whole frame buffer 1000 scan
conversions.
14. LCD Displays
● Thinner and lighter. No tube and electron
beams.
● Blocking/unblocking light through polarized
crystals.
● A matrix of LC cells
one for each pixel.
● No refresh unless the
screen changes.
● Color 3 cells per pixel.
15. Simple Raster Display
System
● Frame buffer: stored pixel map of screen
● Video controller just refreshes the frame
buffer on the monitor periodically.
Peripheral
Devices
System Bus
CPU
System
Memor
y
Frame
Buffer
Video
Controller
Monito
r
16. ● Inexpensive
● Scan conversion of output primitives (lines,
rectangles etc.) done by the CPU. Slow.
● As refresh cycle increases, memory cycles
used by the video controller increases.
Memory is less available to CPU.
● Solution: Graphics Display Processor
17. Graphics Display
Processor
● Scan conversion, output primitives, raster
operations (double buffering)
● Separete frame
buffer
CPU
System Bus
D. Proc.
memory.
Frame
Buffer
Peripheral
Devices
Video
Controller
Monito
r
Display
Processor
System
Memory
18. Computer Graphics
Software
● Rendering Primitives
– Models are composed of, or can be converted to,
a large number of geometric primitives.
– Typical rendering primitives directly supported in
hardware include:
● Points (single pixels)
● Line segments
● Polygons (perhaps simple, triangle, rectangle)
19. – Modeling primitives include these, but also
● Piecewise polynomial (spline) curves
● Piecewise polynomial (spline) surfaces
● Implicit surfaces (quadrics, blobbies, etc.)
● Other...
– Software renderer may support modeling
primitives directly, or may convert them into
polygonal or linear approximations for hardware
rendering
20. Algorithms
● A number of basic algorithms are needed:
– Transformation: Convert representations of
models/primitives from one coordinate system to
another
– Clipping/Hidden surface removal: remove
primitives and part of primitives that are not
visible on the display
– Rasterization: Convert a projected screen space
primitive to a set of pixels.
21. ● Advanced algorithms:
– Picking: select a 3D obejct by clicking an input
device over a pixel location.
– Shading and illumination: Simulate the
interaction of light with a scene.
– Animation: Simulate movement by rendering a
sequence of frames.
22. Application
Programming
Interfaces
● X11: 2D rasterization
● Postscript, PDF: 2D transformations, 2D
rasterization
● Phigs+, GL, OpenGL, Direct3D: 3D pipeline
● APIs provide access to rendering hardware
via conceptual model.
● APIs abstract the hardware implementations
and algorithms in standard software calls.
23. ● For 3D interactive applications, we might
modify the scene or a model directly or just
the change the attributes like viewing
information.
● We need to interface to input devices in an
event-driven, asynchronous and device
independent fashion. APIs and toolkits are
also defined for this task. GLUT, Qt, GTK,
MFC, DirectX, Motif, Tcl/Tk.
24. Graphics Rendering
Pipeline
● Rendering: conversion from scene to
image
3D
Scene 2D Image
● Scene is represented as a model composed
of primitives. Model is generated by a
program or input by a user.
● Image is drawn on an output device:
monitor, printer, memory, file, video frame.
Device independence.
25. ● Typically rendering process is divided into
steps called the graphics pipeline.
● Some steps are implemented by graphics
hardware.
● Programmable graphics accelerator, GPU:
programmable pipelines in graphics hardware
26. ● The basic forward projection pipeline:
Model
Model
Model
M1
M2
M3
3D World
Scene
3D View
Scene
V
P Clip Normalize 2D/3D Device
Scene
2D Image
Projection
Rasterization
Modeling
Transformations
Viewing
Transformations
MCS WCS VCS
NDCS DCS
SCS