Discrete Techniques Chapter 7 Begun February 22, 2005 Finished April 26, 2005

Buffers  Frame buffer consists of  Front color buffer  Back color buffer  Depth buffer  Each buffer has the dimensions (n x m) of the display window.  The depth (k) of each buffer can vary. For RGB, it would be the number of bits per color X 3 colors.  Bitplane refers to any of the k n x m planes.

Digital Images  Glubyte myColorImage [512][512][3];  Glubyte myGrayImage [512][512];  Glubyte myLUTImage [512][512], red[256], green[256], blue[256];

Creating Digital Images  With an algorithm.  From data.  From standard image formats.  GIF  TIFF  PS  EPS  JPEG  OpenGL does not support image formats.  From graphics system.

Writing Into Buffers  Bitblt write operation  Write_block(  source /* buffer */,  n /* nrows */,  m /* ncols */,  x /* lower left x pos */,  y /* lower left y pos */,  destination /* buffer */,  u /* destination pos x */,  v /* destination pos y */);

Writing Modes  Define write  Simple assignment  x1 = x2  Replacement function  d = f(d, s)

Writing With XOR  Most interesting function  Painting Application  S  S xor M  M  S xor M  S  S xor M

Bit and Pixel Operations in OpenGL  Defines an internal cursor  glRasterPos3f(x, y, z);  glBitmap(width, /* # bits wide */ height, /* # bits high */ x0, /*offset from current raster position */ y0, /* offset from current rster position */ xi, /* x increment */ Xy, /* y increment */

Raster Fonts

Pixels and Images

Lookup Tables

Buffers for Picking

Mapping Methods

Texture Mapping

2D Texture Mapping

Texture Mapping in OpenGL

Texture Objects and Multitexturing

Texture Generation

Environmental Maps

Bump Maps

Compositing Techniques

Opacity and Blending

Image Compositing

Blending and Compositing in OpenGL

Antialiasing

Back-to-front and Front-to- back Rendering

Depth Cue and Fog

Multirendering and the Accumulation Buffer

Scene Antialiasing

Bump Mapping and Embossing

Image Processing

Image Extensions

Other Multipass Methods

Sampling and Antialiasing

Sampling Theory

Reconstruction

Quantization  Each sample must be quantized into k discrete levels.  Analog Scale - whole number of lbs  Image - pixel color  Binary image - two colors, b/w 

Program 4  Due March 3, 2005  Documentation 10%  Style 10%  Compiles 30%  Graphic Output 10%